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How to calculate the integration with Matlab?

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Trung Khoa Le
Trung Khoa Le 2018-3-26
评论： Rena Berman 2018-4-5
I need support in calculating integration of function below. I tried to use int(), integral() in matlab documentation, but it did not work. You can help me either by providing key works so that I google it, or providing me matlab code as an example for later use. Thanks
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Jan
Jan 2018-3-26
This looks like a homework question: "10pt". Then please post, what you have tried so far and ask a specific question. See how-do-i-get-help-on-homework-questions. Thanks.

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采纳的回答

Birdman
Birdman 2018-3-26
Try this:
syms U(t) X(t) s
R=0.01;C=4;
U(t)=piecewise(t<0,0,t>=0,sin(100*pi*t));
fun(s)=exp(-s/(R*C))*U(t-s);
X(t)=(1/R*C)*int(fun,s,0,Inf);
t=0:0.001:0.2;
Xt=X(t); %X(t) function is calculated for t vector
plot(t,Xt)
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Birdman
Birdman 2018-3-26
He said he used int(), integral() and was unable to solve the question. I believe that he showed effort.
Trung Khoa Le
Trung Khoa Le 2018-3-26
Yes I did, first I tried syms t,s but it did not work, then I tried work-around solutions (searching on the Internet) to find out reasons, but could not find anything. It is homework but not mine. I just tried to do it as the way to learn Matlab ^^.

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更多回答（1 个）

Walter Roberson
Walter Roberson 2018-3-26
When you have a fixed number of samples then evaluate the function at the provided locations and use trapz()

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