#7936: Calculus constructions mix explicit calls to maxima
-------------------------------+--------------------------------------------
Reporter: robertwb | Owner: mvngu
Type: defect | Status: needs_info
Priority: major | Milestone: sage-4.3.2
Component: documentation | Keywords:
Author: Minh Van Nguyen | Upstream: N/A
Reviewer: | Merged:
Work_issues: |
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Comment(by mvngu):
Replying to [comment:8 wdj]:
> I give a positive review to the first patch.
I think the attachment
[http://trac.sagemath.org/sage_trac/attachment/ticket/7936/trac_7936-constructions.patch
trac_7936-constructions.patch] is now superseded by #8132. No need to use
that patch anymore.
[[BR]][[BR]]
> I don't understand the second patch. The instructions for patch 2 are
just completely unclear to me.
Without the attachment
[http://trac.sagemath.org/sage_trac/attachment/ticket/7936/trac_7936-desolvers.patch
trac_7936-desolvers.patch] applied to the repository `examples/calculus`,
I get an error when loading the file `desolvers.sage`:
{{{
[mv...@mod calculus]$ pwd
/dev/shm/mvngu/sage-4.3.2.alpha1-sage.math/examples/calculus
[mv...@mod calculus]$ ls
desolvers.py eulers_method.sage newton_raphson.sage
desolvers.sage field_plot2d.sage README.txt
[mv...@mod calculus]$ ../../sage
----------------------------------------------------------------------
| Sage Version 4.3.2.alpha1, Release Date: 2010-01-31 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
**********************************************************************
* *
* Warning: this is a prerelease version, and it may be unstable. *
* *
**********************************************************************
sage: load "desolvers.sage"
------------------------------------------------------------
File "<string>", line 147
#maxima.eval(cmd)
^
SyntaxError: invalid syntax
}}}
Now apply the patch
[http://trac.sagemath.org/sage_trac/attachment/ticket/7936/trac_7936-desolvers.patch
trac_7936-desolvers.patch] to the repository `examples/calculus` to
resolve this syntax error:
{{{
[mv...@mod calculus]$ hg qimport http://trac.sagemath.org/sage_trac/raw-
attachment/ticket/7936/trac_7936-desolvers.patch && hg qpush
adding trac_7936-desolvers.patch to series file
applying trac_7936-desolvers.patch
now at: trac_7936-desolvers.patch
[mv...@mod calculus]$ ../../sage
----------------------------------------------------------------------
| Sage Version 4.3.2.alpha1, Release Date: 2010-01-31 |
| Type notebook() for the GUI, and license() for information. |
----------------------------------------------------------------------
**********************************************************************
* *
* Warning: this is a prerelease version, and it may be unstable. *
* *
**********************************************************************
sage: load "desolvers.sage"
sage: des=["'diff(x(t),t)=-4*y(t)","'diff(y(t),t)=-x(t)"]
sage: vars = ["t","x","y"]
sage: desolve_system(des,vars)
[x(t)=(2*y(0)+x(0))*%e^-(2*t)/2-(2*y(0)-x(0))*%e^(2*t)/2,y(t)=(2*y(0)-x(0))*%e^(2*t)/4+(2*y(0)+x(0))*%e^-(2*t)/4]
}}}
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/7936#comment:9>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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