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Selecting different element of a matrix with each function operation

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JD
JD 2018-4-30
评论： sloppydisk 2018-4-30
Hi guys,
Say I have a two column 5x2 matrix A (defined as a global variable) with 0,1,2,3,4 in the first column and 2,4,6,8,10 in the second column. Say I also have a function in a separate function file that goes something like this:
function y = func(x)
global A;
y = x - A(p,n)
end
In my main Matlab file (where A is), I've set up a 'while' loop whereby func(x) continuously operates for a total of 5 times.
So my question/problem is this: for each operation of func(x), is it possible to select a different element of the matrix A. For example, for the first func(x) operation, I want it to carry out y = x - A(1,2); for the second func(x) operation, I want it to carry out y = x - A(2,2), and so on until the fifth func(x) operation completes.
Hopefully this is somewhat understandable - I've 'created' the above problem as an example designed to highlight the specific issue I'm trying to tackle, so it might not work/make sense as a whole.
Any help is greatly appreciated.

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sloppydisk
sloppydisk 2018-4-30
Hi JD,
You could pass a counter variable i to your function as such:
i = 1;
while condition
i = i+1;
end
function y = func(x, i)
global A;
y = x - A(i,2);
end

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