Patch to make ic2 work even with i.c. 'y(x)= (fwd)

> From: Robert Dodier
> 
> On 1/30/09, Christophe Deroulers wrote:
> 
> >   This is a patch proposal / feature request.
> >
> >   In brief:
> >   ---------
> >   Change subs([xa,ya],soln) to subs([ya,xa],soln) in the 
> line 318 of 
> > the file share/diffequations/ode2.mac .
> >
> >   This would allow initial conditions like 'y(x)=2 (for an O.D.E. 
> > written like "... + 'y(x)= 0") in addition to initial 
> conditions like 
> > y=2 (for an O.D.E. written like "... + y = 0").
> 
> OK by me if we can verify that the proposed patch doesn't 
> change the behavior of the ODE code for existing problems.
> There is a large test suite for Maxima's ODE code -- I don't 
> know how much (if any) calls the function touched by the patch.
> Perhaps you, Christophe, can look into it and report on it.

There are only two tests of ic2 in the testsuite, and none in 
the share/contrib/diffequations testsuite.  I think we need 
more before we can be sure there are no adverse effects.

I haven't had time to look at this patch.  I will see what I can 
do in the next couple of weeks.

	David

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