Re: [sage-support] algorithme
On 2019-1-19 15:52, MAMANE DJAMILOU Salissou Dango wrote: Bonjour, je suis un tous nouveau utilisateur de sagemath. Je maîtrise les opérations indépendantes. Mon souci se trouve au nivaux des algorithmes. je n'arrive, jusque là pas à comprendre comment programmer avec sageMath (voir les ''screenshots''). merci de m'aider à démarrer. An attempt at translation: Good day, I am a very new user of sagemath. I am mastering independent operations. My trouble is on the level of algorithms. So far, I cannot understand how to program with sageMath (see the screenshots). Thanks for helping me to get started. -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
[sage-support] Piecewise polynomials in general
Speaking of piecewise functions, does anyone happen to know of a piecewise polynomial object for Python? I tried writing one (based on numpy.poly1d) but its integration method seems to have a bug. It surprises me that I haven't found one on the fertile Web. -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] Re: this circuit used to work but it doesn't anymore ?
The content is not the problem. The problem is that, for many mail readers, your query about "this circuit" is buried within the thread "Error building OpenBias", so someone not interested in building OpenBias may not see it. To start a new topic, don't reply to an old one. On 2017-2-05 02:21, Henri Girard wrote: Sorry I didn't notice it. I believed I had delete all contents of previous message. Le 05/02/2017 à 10:28, Dima Pasechnik a écrit : This is merely to point out that this message has little to do with the original thread. And its subject is hidden from the reader, unless you click on the topic about OpenBlas and see this:... Please make sure to post such things separately, not inside an irrelevant thread... -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] Comparing many lists to each other
On 2016-10-01 12:27, saad khalid wrote: That's about my idea right now. Do you have any tips or tricks to make it faster? Are there any list comprehension tricks I'm missing? Thanks in advance! If you're interested in the number of sub-lists that have the first n elements in common, sort the list and compare only nearby rows; something like this: mytaylors.sort() matchcounter = [0] * 21 for j in xrange(len(mytaylors)): for k in xrange(j+1,len(mytaylors)): if mytaylors[j][0] != mytaylors[k][0]: break for n in xrange(1,20): if mytaylors[j][n] == mytaylors[k][n]: continue matchcounter[n] += 1 break else: matchcounter[20] += 1 -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] Re: logged out
On Monday, September 12, 2016 at 5:59:42 AM UTC, Anton Sherwood wrote: Oh heck. I used my local Sage "server" yesterday, and (thinking nothing of it) signed out before shutting it down; and now it wants me to sign in. I don't remember ever signing in before, and have no idea what it thinks my username is! On 2016-9-12 06:58, Dima Pasechnik wrote: admin (most probably, IMHO) And now when I fire it up I'm logged in, apparently as admin. Funny old world. I wonder whether there's a password. -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
[sage-support] logged out
Oh heck. I used my local Sage "server" yesterday, and (thinking nothing of it) signed out before shutting it down; and now it wants me to sign in. I don't remember ever signing in before, and have no idea what it thinks my username is! -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
[sage-support] linear solutions
I haven't guessed the right keywords. How do I solve a set of linear equations in which the coefficients are symbolic expressions like a^2-sqrt(b)? -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] Re: Series expansion is incorrect?
saad khalid wrote: I want to take get the Laurent series expansion of it. It can be seen through Wolfram Alpha here: http://www.wolframalpha.com/input/?i=laurent+series+expansion+of+%282t^3%2B1%29%2F%28%28t^2%2Bt%2B1%29^2%28t-1%29^2%29 On 2016-5-24 09:28, Nils Bruin wrote: Your wolfram alpha output looks like an unreadable URL I guess your mail-reader, like mine, thinks "^" is not valid in a URL; but pasting works. -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] Partial differentiation on Sage
On 2016-2-29 15:13, saad khalid wrote:
r,theta,y =var("r,theta,y")
x =r*cos(theta)
f1 =x^2+y^2
f1(x).diff(x)
|
I'm getting 2x as the output, when what I want is -2x. What am I doing
wrong?
When you take the partial derivative of f1 with respect to x,
you hold y constant and ignore r.
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Re: [sage-support] Partial differentiation on Sage
On 2016-2-29 15:13, saad khalid wrote: Hey everyone. So, here's the problem I have: z = x^2 + y^2 x = r*cos(theta) y = r*sin(theta) I need to calculate the partial derivative (dz/dx) while holding r constant. [...] Seems to me what you want is z_theta / x_theta, i.e., the ratio of two partial derivatives with respect to theta, which of course assumes constant r. -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at https://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] Sage error HELP
On 2015-8-13 04:22, Luis Molina wrote: def slopeline(x=(-5,5)): p=plot(x^n, (n,0,6), ymin=-5^4, ymax= 5^4) show(p) What is (-5,5)^n supposed to be? -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] bug in == operator?
For fun I found the continued fraction expression of the ratio of these two big integers: 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 4, 1, 3, 12, 5, 1, 2, 1, 19, 3, 3, 3, 1, 1, 3, 2, 2, 3, 1, 5, 1, 4, 28, 2, 1, 3, 1, 2, 2, 1, 1, 1, 1, 10, 4, 1, 5, 6, 13, 1, 1, 2, 23, 1, 3, 16, 1, 29, 14, 4, 1, 3, 2. It agrees with sqrt(2) for 70 steps. On 2015-7-12 23:54, David Goldberg wrote: This is in SageMath Version 6.6, Release Date: 2015-04-14 running on a MacBook. The following lines print 'equal', even though m and m1 do not appear equal to me! m=540579833922455191419978421211010409605356811833049025*sqrt(1/2) m1=382247666339265723780973363167714496025733124557617743 if m == m1: print "equal" -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] Sage 5.9
On 2015-5-22 09:09, jlassi ines wrote: Please I have a big problem with Sage 5.9, I used to work on this version and all my codes are online and I never found a problem except that this week I can not enter there and it shows me this error message. Le serveur est temporairement incapable de traiter votre demande en raison de temps d'arrêt de maintenance ou des problèmes de capacité. S'il vous plaît réessayer plus tard. "The server is temporarily unable to handle your request because of a maintenance shutdown period or problems of capacity. Please try again later." When you say "this week", do you mean you've been seeing this message for days? -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] Appending to lists
On 2015-5-15 21:07, Phoenix wrote: What is wrong with this code? ''' I am trying to see if I can create a list of tuples such that the first coordinate of eachh tuple is itself a list of lists. Then inside the loop I am trying to update a tuple such that I will add a new list to its first coordinate and change its other coordinate. ''' I think this is closer to what you want: c = [] for (x,y) in b: x.append( [4,5,6] ) c.append( (x,y+1) ) b = c Or: b = [ (x+[[4,5,6]],y+1) for (x,y) in b ] -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] Re: Appending to lists
Phoenix: no, x.append() *operates on* x but does not *return* the new x as a value (as you might expect in C); the value of x.append() is None. -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] Can someone help understand this error ? (that is generated for large inputs)
Is it only because I'm old that I see something inelegant about a post that re-quotes (without commenting on any but the newest) eight generations of quoted matter, including ninety blank lines and four copies of "You received this message because"? -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] What does izip do as compared to zip ?
On 2015-5-12 18:42, Phoenix wrote: I mean after doing either a izip or a zip to create the list "k" can I run a loop through "k" like this ? for (a,b) in k Yes, that's what izip is for. -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] What does izip do as compared to zip ?
On 2015-5-12 18:39, Phoenix wrote: So is functionally izip exactly the same as zip but faster? NO. zip() builds a list, an object that takes up space proportional to the number of entries. itertools.izip() makes an iterator: a function that generates the items that would be in the list, but one by one as needed (see "yield"), never saving them; the speed advantage is in the absence of memory management. You can do some listlike things with the output of izip(), but not all; you can't concatenate it or sort it, for example. -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] What does izip do as compared to zip ?
On 2015-5-12 17:30, Phoenix wrote: So what is the way to display the result of the izip ? I changed print izip(A,X) to for j in izip(A,X): print j -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] What does izip do as compared to zip ?
Does your show() do operations on the input other than "for item in
inputlist"?
I replaced the meat of your loop with
print "X=", X
print "k=", zip(A,X)
print "ik=", izip(A,X)
and this was the output of the first iteration:
X= ('a', 'b', 'a')
k= [(1, 'a'), (2, 'b'), (3, 'a')]
ik=
On 2015-5-12 16:56, Phoenix wrote:
I was under the impression that izip is a better alternative than zip
when the two sets are large.
But thats not what its turning out to be.
(in practice I would have A to be a set of size ~200-300 and B would be
of size ~10-50 )
A = [1,2,3]
B = ["a","b"]
from itertools import product
from itertools import izip
for X in product(B,repeat = len (A)):
k = izip(A,X)
show(k)
[THE ABOVE izip VERSION DOESN'T WORK!]
VS
A = [1,2,3]
B = ["a","b"]
from itertools import product
for X in product(B,repeat = len (A)):
k = zip(A,X)
show(k)
[THE ABOVE zip VERSION WORKS]
Can someone help?
--
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Re: [sage-support] Decimal Answers
On 2015-5-11 17:21, Michael Orlitzky wrote: The "e10" at the end is scientific notation. I don't know where the 'e' came from, but I would guess it stands for "exponent" and I would bet we use 'e' because there was no way to write a superscript when hand-held calculators were invented. O youth! It was used in Fortran about twenty years before that. (For double precision numbers the E became D, iirc.) -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] extension de corps
On 2014-3-20 02:07, John Cremona wrote: You are going to have to make your question more specific: which field are you starting from and wgat kind of extension are you trying ot make? Which version of Sage are you using? (traduction bien libre) "Vous devrez poser une question plus précise: quel espèce d'extension, à partir de quel corps? De quelle version de Sage servez-vous?" -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] extension de corps
On 2014-3-19 13:26, ghammamlou...@gmail.com wrote: Bonsoir SVP, j'ai besoin de definir sur Sage 3 extensions de corps, > mais je n'arrive pas. Je peux definir que deux extensions. "Good evening "If you please, I need to define on Sage 3 extensions of body[?], but I do not succeed. I can define only two extensions." -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support. For more options, visit https://groups.google.com/d/optout.
Re: [sage-support] Random sum of functions
On 2013-7-17 02:07, Laurent Decreusefond wrote:
For any tuple of integer (a_1,a_2, ..., a_k), [...]
I want to form the function
z -> sum_{i=1}^k |f(a_i, z)|^2
Won't this work?
def ff(atuple,z):
return sum([ abs(f(n,z))**2 for n in atuple ])
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Re: [sage-support] Connection among the vertices on a plane or hyperplane
On 2013-3-06 17:51, Asad Akhlaq wrote: Thanks for your reply. One more question please. In the original simplex I have 9 vertices and each vertex is connected to 8 others. In the new polytope, after cut by hyperplane, I have 5 vertices from the original simplex (that are connected to each other) plus 16 new vertices. Now how can I know if I have a one-to-one connection among all the 21 vertices in the new polytope? Is there any procedure to investigate that whether there is a connection among vertices? The easiest way is probably a convex hull algorithm (as you suggested before), assuming that it provides all the elements (edges etc.) and not only the bounding hyperplanes (which you already have!). -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sage-support] Connection among the vertices on a plane or hyperplane
On 2013-3-05 16:04, Asad Akhlaq wrote: ... My ultimate goal is to find the volume of this new piece. To find the volume of this piece, can I just take a convex hull of these 21 vertices and find the volume of that piece? Will it give me the correct result? Yes: since the original object (a simplex) is convex, any piece sliced from it (by a planar cut) will also be convex. -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sage-support] Connection among the vertices on a plane or hyperplane
On 2013-3-04 22:21, Asad Akhlaq wrote: I am solving a problem where I want know that whether certain vertices on a hyperplane are connected to each other or not (i.e there exists an edge between two vertices). Say in a 2D plane, if I have 3 or more vertices (points), how can I decide that if all or some of these vertices are connected to each other? Similar is the problem for a hyperplane. Do we have any function/class is sage that can do it? I heard about convex hull algorithms but I don't know how to apply them to this problem. OR can we use graphs to solve this problem? Vertices and edges of what? Seems to me you need either a graph or a convex hull for the question to have any meaning! How does the problem arise? -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To unsubscribe from this group and stop receiving emails from it, send an email to sage-support+unsubscr...@googlegroups.com. To post to this group, send email to sage-support@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
Re: [sage-support] Re: polychoral symmetry groups
Okay, sage.groups.matrix_gps.matrix_group.MatrixGroup() appears to be what I need. Thanks for the keyword! -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To post to this group, send email to sage-support@googlegroups.com. To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support?hl=en.
[sage-support] polychoral symmetry groups
I have a project in mind that involves the symmetry groups of the regular four-dimensional polytopes. I'm told that enumeration of a group from its generators is a by-product of the Todd-Coxeter algorithm. Unfortunately, I can't make sense of Wikipedia's description of TC, nor of the one implementation of it that I've seen (in C++; jenn3d.org). I hope that this is not the wrong place to ask, and that one of you can point me to an implementation of Todd-Coxeter in Sage or Python (Sage preferred, as I'd like to have the square roots handled algebraically rather than numerically) -- or, as long as I'm wishing, a list of the 14400 isometry matrices of the [5,3,3] group. -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To post to this group, send email to sage-support@googlegroups.com. To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support?hl=en.
Re: [sage-support] How do you stop sage in the middle of a block?
On 2012-11-20 10:48, LFS wrote: How do you get sage out of a loop early? How do you get sage to totally stop in the middle of a block? Two ways have been mentioned; yet another is a custom Exception: class IWantOut(Exception): pass try: loop ... ... raise IWantOut ... except IWantOut: respond to that condition -- *\\* Anton Sherwood *\\* www.bendwavy.org -- You received this message because you are subscribed to the Google Groups "sage-support" group. To post to this group, send email to sage-support@googlegroups.com. To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com. Visit this group at http://groups.google.com/group/sage-support?hl=en.
Re: [sage-support] Application/Use of Sage in IT company or Industries
On 2012-5-10 04:59, Nathann Cohen wrote: I would not use it myself if I were not adding code to it, and I add code to it because through the years it remains unable to do what I would like it to do without having to code it myself. It's turtles all the way down! -- Anton Sherwood *\\* www.bendwavy.org *\\* www.zazzle.com/tamfang -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] Re: Using mpi4py in sage 'online' notebook (atsagenb.org)
On 2012-3-18 22:57, Simon King wrote: Why has the original post been marked as spam? Possibly the phrase "I just started using and am loving it!" is a red flag. (I didn't see it marked as spam.) -- Anton Sherwood *\\* www.bendwavy.org *\\* www.zazzle.com/tamfang -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] Polyhedron.radius() bug?
On 2012-2-10 05:27, rickhg12hs wrote: "Return the maximal distance from the center to a vertex." Shouldn't this be translation invariant? Could 'center' here mean 'origin'? It's not obviously unreasonable to assume that a polyhedron is defined so that they coincide. -- Anton Sherwood *\\* www.bendwavy.org *\\* www.zazzle.com/tamfang -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] functions
Chappman wrote: >> Yes I do want a function of some sort here, but I do not >> want a "def chaps(u,v)" like what anton has done for now, [...] On 2012-2-08 02:39, Robert Bradshaw wrote: It sounds like what you're saying is "I want a function, but I don't want a function." [...] Or "I want a function, but I don't like Python's function syntax." -- Anton Sherwood *\\* www.bendwavy.org *\\* www.zazzle.com/tamfang -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] functions
On 2012-2-07 01:18, Chappman wrote:
Hi Rob,
with this syntex:
x=0
for y_1 in [1..2]:
for y_2 in [1..y_1]:
x += [y_1,y_2]
print x
what I am trying to do is, trying to use the two numbers y_1 and y_2
in x +=[y_1,y_2]
to assign it a number from previously set conditions
if y_1 = y_2:
y_1 = y_2 = 2
elif y_1>y_2:
y_1 = y_2 = 1
but currently my code is having trouble doing that.
Is there a way to do this please?
Are you trying to define [u,v] as a function whose value is 2 if the
arguments are equal and 1 if u>v? (What if vproblems, you can't do that with [], because that symbol is reserved for
lists.
Here's how I'd do what I think you're trying to do:
# define a function of two inputs
def chap(u,v):
if u==v: return 2
# no 'else' needed, because 'return' breaks out of the function
if u>v: return 1
return None # ought to be a numeric value
x=0
for y1 in range(1,3):
for y2 in range(1,y1+1):
x += chap(y1,y2)
print x
--
Anton Sherwood *\\* www.bendwavy.org *\\* www.zazzle.com/tamfang
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Re: [sage-support] help with filtering between two lists.
On 2012-1-02 09:24, Eric Kangas wrote:
l1 = [int(x) for x in p]
l2 = [int(x) for x in d]
l3 = []
x = 0
for x in l1,l2:
This will give x the values l1 and l2,
which are not valid indices.
> if l1[x:x+1]==l2[x:x+1];
> l3.insert(x, (x,l1[x:x+1],l2[x:x+1]));
Why ranges (which are lists) rather than simple items?
Why record two numbers that are always equal (or else unrecorded)?
Is "l3.insert(x, ...)" valid when len(l3) < x?
Others have suggested how to do it with a one-liner.
Here's better syntax for the 'naive' approach:
for x in range(min(len(l1),len(l2)):
if l1[x] == l2[x]:
l3.append((x,l1[x]))
print l3
--
Anton Sherwood *\\* www.bendwavy.org *\\* www.zazzle.com/tamfang
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Re: [sage-support] Re: Power series expansion
On 2011-12-02 08:17, Julie wrote: Unfortunately, having the Tayor series approach out, don't think it's really appropriate for my problem afterall, as what I esentially need to do is find the coefficientsof p^0*y^0, p, y, p^2*y etc in the formula (0.030*0.248244^y)y+0.05721*(0.248244^y)p +0.08838*(0.248244^y) > [...] Since this is not a polynomial in p and y, what does it mean to obtain the coefficients of p^j y^k *if not* those of something very similar to a Taylor series? -- Anton Sherwood *\\* www.bendwavy.org *\\* www.zazzle.com/tamfang -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] Re: Installing latest sage
On 2011-11-28 03:02, Dima Pasechnik wrote: Indeed. That tablet runs Pentium M, which is kind of old nowadays. Has the instruction set changed in recent years? I assumed it had stabilized awhile back. -- Anton Sherwood *\\* www.bendwavy.org *\\* www.zazzle.com/tamfang -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] complex parts
On 2011-9-14 23:35, Robert Bradshaw wrote: ... Otherwise, z.real, z.imag is probably going to be as fast as you can get, and there's no need to define a function, you could just write sage: a = complex(3,4) sage: x, y = a.real, a.imag For trivial cases, yeah, but consider parametric_plot((f(t-0.5j).real, f(t-0.5j).imag), (t,tmin,tmax)) parametric_plot(ReIm(f(t-0.5j)), (t,tmin,tmax)) -- Anton Sherwood *\\* www.bendwavy.org *\\* www.zazzle.com/tamfang -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] complex parts
Is there a function inverse to complex(x,y), such that (x,y) == ReIm(complex(x,y)) ? I could obviously write one -- def ReIm(z): return (z.real,z.imag) -- but presumably a library function if it exists would be speedier. -- Anton Sherwood *\\* www.bendwavy.org *\\* www.zazzle.com/tamfang -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
[sage-support] cleaner?
Whenever I shut down my computer, I find that python ~/sage/local/bin/sage-cleaner is still running. Does it ever end? -- Anton Sherwood *\\* www.bendwavy.org *\\* www.zazzle.com/tamfang -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] noob q: working directory
Thank you. Curiosity is satisfied for now. On 2011-9-03 14:17, Jason Grout wrote: The graphic eventually would end up in your sage notebook, which would be in ~/.sage/sage_notebook.sagenb/. The temporary directory the graphic originally is in would be something like /tmp/something... You can do: import os print os.getcwd() to see the temp directory for a particular cell. -- Anton Sherwood *\\* www.bendwavy.org *\\* www.zazzle.com/tamfang -- To post to this group, send email to sage-support@googlegroups.com To unsubscribe from this group, send email to sage-support+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sage-support URL: http://www.sagemath.org
Re: [sage-support] noob q: working directory
In the tutorial:
Alternatively, evaluating c.save('filename.png')
will save the plot to the given file.
I tried it, then searched my disk for the relevant filename
with no result. Is it a bug? What directory ought it to be in?
Jason Grout wrote:
In the notebook, the graphic would be saved in a temporary directory
specific to that cell. The graphic would then be copied to a directory
inside the sage notebook directory tree. If you wanted to save it
somewhere specific from the notebook, use the full path:
c.save('/home/mydir/test.png')
Okay, that worked. I'm still curious about the default, tho.
In MacOS might it be somewhere within
/Applications/Sage-4.7.1-OSX-64bit-10.6.app/ ?
or ~/Library/Application Support/ ?
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[sage-support] noob q: working directory
Hi everybody.
In the tutorial:
Alternatively, evaluating c.save('filename.png')
will save the plot to the given file.
I tried it, then searched my disk for the relevant filename
with no result. Is it a bug? What directory ought it to be in?
If I try to read in a file, what is the base directory?
...
Also: ARGH. Google Groups won't let me register with my preferred
address (bro...@pobox.com).
--
Anton Sherwood *\\* www.bendwavy.org *\\* www.zazzle.com/tamfang
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