Integral(v,t).doit() differs from integrate(v,t)

[hercidav]

Hi,

I want to lambdify an integral including vector (sympy.Matrix) and I am expecting to get a vector as well. I used the doit() function on Integral, however the results are somewhat strange. Below is a simple example in the sympy online shell (I hope it works just like that).
Basically, having a vector v = (a*t,b,c), I do integrate(v,t), which gives me (a*t**2/2, b*t,c*t), an expected result. Doing Integral(v,t).doit() gives a*t**4/3+b*t**2/2+c*t... Any suggestions? Do I have some wrong assumptions?
Thanks a lot in advance,

David

http://live.sympy.org/?evaluate=a%2Cb%2Cc%3Dsymbols%28%27a%20b%20c%27%29%0A%23--%0Av%3DMatrix%28[a%2Cb%2Cc]%29%0A%23--%0Avt%3DMatrix%28[a*t%2Cb%2Cc]%29%0A%23--%0Aintegrate%28vt%2Ct%29%0A%23--%0AIntegral%28vt%2Ct%29.doit%28%29%0A%23--%0A

[Aaron Meurer]

That's definitely a bug. The two should always give the same answer. Can you open an issue for it?

Aaron Meurer

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[hercidav]

Hi Aaron,

thanks a lot for your answer. I have opened the issue:
https://github.com/sympy/sympy/issues/10567

David Hercik