How do i multiply two functions

2018 1 14
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更新时间：2018 1 14
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Hello, i have an assignment for school in which i need to plot the z function, where z needs to be:
z=x1*x2,
x1=29*t^2-165*t+420
x2=x2=symsum((-1)^k*dirac(t-24*k), k, -100, 100),
and t=0:1:24*25 (to represent 25 periods of x2).
But when i try to multiply x1 with x2, i get this error:
Error using symengine, The dimensions do not match.
What can i do?

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Jan
Jan 2018-1-14
编辑：Jan 2018-1-14
Please post the code you have tried for this multiplication. Obviously it contains an error, but if the readers do not know, how you have tried this, they have to guess.
I have formatted your code this time using the "{} Code" button.

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Birdman
Birdman 2018-1-14

0 个投票

Try this:
syms t k
x1=29*t^2-165*t+420
x2=symsum((-1)^k*dirac(t-24*k), k, -100, 100)
tt=subs(t,0:1:24*25);
x1=subs(x1,t,tt)
x2=subs(x2,t,tt)
z=x1.*x2;

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