How to call a function with a vector?

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Issie
Issie 2019-3-6
编辑： Issie 2019-3-7
I need to modify the following code so that the function can be called with a vector for the value of b instead of just a single value. Any ideas?
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Stephen23
Stephen23 2019-3-6
You need to understand the difference between array and matrix operations, otherwise your MATLAB code will produce nonsense and you won't know why:
https://www.mathworks.com/help/matlab/matlab_prog/array-vs-matrix-operations.html
Stephen23
Stephen23 2019-3-6
编辑：Stephen23 2019-3-6
@Issie: you forgot to actually call the function. What you did:
>> result = (@(x) sin(x.^2), 0, 3, 50)
^^ Where is the function you want to call?
What you need:
>> result = fresnelS(@(x) sin(x.^2), 0, 3, 50)
^^^^^^^^ Your function !!!
PS: please do not post screenshots, posting actual text is much better (we already know what error message look like).

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回答（1 个）

Kevin Phung
Kevin Phung 2019-3-6
编辑：Kevin Phung 2019-3-6
if you are multiplying or dividing vectors, include the element-wise operator
.* %multiplication
./ %division
example documentation:
https://www.mathworks.com/help/matlab/ref/times.html
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Adam
Adam 2019-3-7
编辑：Adam 2019-3-7
h will be a vector if b is and h is multiplied and a division used to create it from b.
Kevin Phung
Kevin Phung 2019-3-7
编辑：Kevin Phung 2019-3-7
Thanks Adam. To clarify, given b is a vector , y and h would become vectors in:
h = (b-a)./n;
y = f(a)+f(b); %where f is cos(x^2)

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