Re: [sage-support] 3dplot not working with Ubuntu 20.00 / Firefox from "Ubuntu Software" (Ubuntu software center)

[Jan Groenewald]

Hi

20.04 (not 20.00) is a little old version now. I have had debian and/or
ubuntu not plot interactive plots (or sometimes 3d ploits)
in the packaged versions, in which case we install sagemath from source.

First check if your issue is related to this TMPDIR issue?
https://ask.sagemath.org/question/68014/no-3d-graphics-with-sage-98-using-conda-forge/
(Isolate a firefox issue from a sagemath issue by trying chromium, also try
your plot on https://sagecell.sagemath.org/ )

Regards,
Jan



On Mon, 7 Aug 2023 at 00:49, Jesper R.  wrote:

> I am having trouble getting plot3d to work on Ubuntu 20.00 with Firefox
> (newest) downloaded from "Ubuntu software" (Ubuntu's software centre).
>
> Firefox browser say that it can't see the file:
> <>
> File not found
>
> Firefox can’t find the file at /tmp/tmpf_qc7k5b/tmp_3nwc11rr.html.
>
> Check the file name for capitalisation or other typing errors.
> Check to see if the file was moved, renamed or deleted.
> <\>
>
> Does anyone have experience with this or is it a bug?
>
> Best regards Jesper
>
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> 
> .
>

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[sage-support] 3dplot not working with Ubuntu 20.00 / Firefox from "Ubuntu Software" (Ubuntu software center)

[Jesper R.]

I am having trouble getting plot3d to work on Ubuntu 20.00 with Firefox 
(newest) downloaded from "Ubuntu software" (Ubuntu's software centre).

Firefox browser say that it can't see the file:
<>
File not found

Firefox can’t find the file at /tmp/tmpf_qc7k5b/tmp_3nwc11rr.html.

Check the file name for capitalisation or other typing errors.
Check to see if the file was moved, renamed or deleted.
<\>

Does anyone have experience with this or is it a bug?

Best regards Jesper

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[sage-support] (Possible) bug in solving a simple complex equation.

[Emmanuel Charpentier]

Consider :
sage: reset() sage: z=var("z") sage: Eq=(3+4*I)^2-2*(z.conjugate())==z ; Eq 
-2*conjugate(z) + 24*I - 7 == z sage: Sol=solve(Eq, z) ; Sol [z == (8*I - 
7/3)] sage: Eq.subs(Sol[0]) (40*I - 7/3) == (8*I - 7/3) sage: 
bool(Eq.subs(Sol[0])) False 

which annoys me *immensely*. It reeks of conjugate() error, which, AFAICT 
is ginac territory…

However :
sage: E2=(Eq.lhs()-Eq.rhs()).subs(z=x+I*y) ; E2 -3*x + I*y + 24*I - 7 sage: 
S2=solve([E2.real(), E2.imag()], [x, y]) ; S2 [[x == (-7/3), y == -24]] 
sage: E2.subs(S2[0]) 0 sage: Eq.subs(z==x+I*y).subs(S2[0]) (-24*I - 7/3) == 
(-24*I - 7/3) 

This failure to solve a *simple* equation on complexes is troubling. 
Re-reading myself did not led me to “obvious” problems.

Does this deserve a critical ticket ?

BTW, there is currently no *free* alternative :
sage: solve(Eq, z, algorithm="sympy") ConditionSet(z, Eq(-z - 
2*conjugate(z) - 7 + 24*I, 0), Complexes) sage: solve(Eq, z, 
algorithm="giac") Warning, the test a==b is performed by checking that the 
internal representation of regroup(a-b) is not 0. Therefore a==b may return 
false even if a and b are mathematically equal, if they have different 
internal representations. You can explicitly call a simplification function 
like simplify(a-b)==0 to avoid this. Warning, argument is not an equation, 
solving false=0 [z] sage: solve(Eq, z, algorithm="fricas") [z == (8*I - 
7/3)] sage: solve(Eq, z, algorithm="maxima") [z == (8*I - 7/3)] sage: 
[[u[1].sage()==u[2].sage() for u in s] for s in mathematica.Solve(Eq, z)] 
[[z == (-24*I - 7/3)]] 

HTH,
​

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