On Sunday, January 19, 2020 at 6:46:50 AM UTC-8, mendes wrote:
>
> #But, for t>1, there is a RuntimeError: mismatch in sr-to-maxima
> var('x,t')
> assume(1<t)
> f=unit_step(t-1)
> g=t
> fg = integrate(f(t=x)*g(t=t-x),x,0,t).simplify_full().expand()
> show(fg)
> forget()
>
> In the meantime, you can, as a workaround, use f=heaviside(t-1). That does
not give an error. Unfortunately, it gives a nonsensical result: it returns
"sage4", which is undoubtedly a symbol that somewhere was supposed to be
bound to the actual result, but which didn't get bound. Looks like it needs
another ticket :-):
sage: var("b")
sage: assume(b>0)
sage: integrate(heaviside(x),x,0,b)
sage4
> #In previous versions of Sage the answer, in the case piecewise functions
> like f*g, could employ the functions like sign() or abs(), but no
> Error messages appeared
>
> #The following alternative raises no Error, but does not evaluate the f*g
> function to t^2/2-t+1/2, as desired:
> var('x,t')
> assume(1<t)
> f=unit_step(t-1)
> g=t
> fg = integrate(f(t=x)*g(t=t-x),x,0,t,hold=False)
> show(fg)
> forget()
>
> Thank you again.
>
>
>
>>>
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