ma...@mendelu.cz wrote:
On 26 bře, 09:43, Jose Guzman <n...@neurohost.org> wrote:
Inhttp://wiki.sagemath.org/days13/projects/sagenewbie
Hi Robert, thanks a lot for your comments. Actually I was not working the
differential calculus (I collaborate with some basic ploting, limits
calculation and basic algebra). However, I took a look to the notebook:
I tried the differential calculus and have some remarks:
1) I got several times a warning:
__main__:3: DeprecationWarning: Substitution using function-call
syntax
and unnamed arguments is deprecated and will be removed from a future
release of Sage; you can use named arguments instead, like EXPR(x=...,
y=...)
sage: f = x**2 + 3*x -1
sage: f(2)
warning...
This is a warning comming in the last versions of Sage. This is because
now it is recommended that you describe explicitly the independent
variable, like this:
sage: f(x) = x**2 + 3*x -1
sage: f(2)
sage: 9
Then, simply substitute f by f(x) in every function declaration
3) The last computation gives RuntimeError: power::eval(): division by
zero
You are right, I think it does not make much sense to look for the
continuity of the function f(x)=1/x, since 1/0 is undefined. I would
suggest to catch the exception when the function f(x) is not defined in
x first, just before calculate the limit of the function . Something
with this:
def continous(f,a):
""" test if a the function f is continous in value a
Returns True if continuous, False otherwise"""
try:
f(a)
except:
return False
if limit(f, x=a)==f(a):
return True
else:
return False
Best!
Jose
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