Hello Sage-lovers,
While playing with SAGE and Dr. Joyner's tutorial on Sage and DE (dated
11-22-2007), I had a rather confusing error message. At some point, I
forgot to put the dependent var in *desolve_laplace()*, which resulted in
the message "... takes at least 2 arguments (2 given)".
*sage:* t=var('t')
*sage**:* y=function('y',t)
*sage:* de = lambda x: diff(x,t,t) + x - 1
*sage:* desolve_laplace(de(y),y)
(y(0) - 1)*cos(t) + sin(t)*D[0](y)(0) + 1
*sage**:* desolve_laplace(de(y),y,ics=[0,0,1])
sin(t) - cos(t) + 1
*sage**:* desolve_laplace(de(y),ics=[0,0,1])
---------------------------------------------------------------------------
TypeError Traceback (most recent call last)
<ipython-input-6-c8674712d431> in <module>()
----> 1 desolve_laplace(de(y),ics=[Integer(0),Integer(0),Integer(1)])
TypeError: desolve_laplace() takes at least 2 arguments (2 given)
I was a bit surprised by this message. That's clearly not a bug, but I
think it would gain by being clearer ("missing dvar" or something.)
And I take this opportunity to thank everybody involved into this project:
this is a super great software.
J. :-)
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