solving integral in matlab

2020 6 3
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更新时间：2020 6 3
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Hi, I want to find the solution to this integral as a function of x: integral(between 0 and x) of (x-z)dz. The answer should be x^2/2. Thanks!

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John D'Errico
John D'Errico 2020-6-3
And what, since this is surely homework, have you tried? Have you tried using int? Read the help and the examples for int. I just did it, and indeed, the answer seems to be x^2/2. So why not make an effort?
David Cuberes
David Cuberes 2020-6-3
John, it is research, not homework. Thanks for asking! This is what I have tried:
fun=@(x-z)dz;
q=integral(fun,0,x)

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Stephan
Stephan 2020-6-3

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What you are looking for is an analytical solution. The integral function does solve numeric. To solve symbolic use int as John already pointed out. Im sure if you read the informations given in the link you will get it very fast.

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David Cuberes
David Cuberes 2020-6-3
Thanks, Stephan. It works doing this:
syms x z
expr = x-z;
Fz = int(expr,z,[0 x])
Stephan
Stephan 2020-6-3
Did you notice that you can accept and/or vote for useful answers?
David Cuberes
David Cuberes 2020-6-3
I gave your comment a thumbs up. Thanks. I am new in this matlab world and in this forum.
Stephan
Stephan 2020-6-3
Feel free to ask the community and be welcome here!

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