Function definition using a variable from a block based on a for loop

Question

Gábor Dupák 2021-4-22

0
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https://ww2.mathworks.cn/matlabcentral/answers/809895-function-definition-using-a-variable-from-a-block-based-on-a-for-loop

评论： Gábor Dupák 2021-4-22

采纳的回答： Steven Lord

Hi!

I would like to create a function in which the definition changes according to a for loop.

I have 2 row vectors from which I want to use values:

A=[1 2 3 4 5 6 7 8 9 10]

Att=[0 2 4 6 8 10 12 14 16 18]

An example:

function [a]=myf(Att)

a=Att(ii)*A(ii);

end

I would like to use the first elements of A and Att in the first cycle then the second and so on. My real function is a bit more complicated, my question is how can I change the variable inside the function according to a for loop.

Thank you!

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Gábor Dupák 2021-4-22

Oh and I know that it can be solved without using a function, but I MUST use a function ! :)

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Answer 1

Steven Lord 2021-4-22

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https://ww2.mathworks.cn/matlabcentral/answers/809895-function-definition-using-a-variable-from-a-block-based-on-a-for-loop#answer_681855

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For this I'd use one of two approaches.

A=[1 2 3 4 5 6 7 8 9 10];
Att=[0 2 4 6 8 10 12 14 16 18];
% Approach 1
y = myf1(Att, A);
for k = 1:numel(Att)
    fprintf("Element %d of the result is %d\n", k, y(k))
end
Element 1 of the result is 0
Element 2 of the result is 4
Element 3 of the result is 12
Element 4 of the result is 24
Element 5 of the result is 40
Element 6 of the result is 60
Element 7 of the result is 84
Element 8 of the result is 112
Element 9 of the result is 144
Element 10 of the result is 180
% Approach 2
for k = 1:numel(Att)
    y = myf2(Att, A, k);
    fprintf("Element %d of the result is %d\n", k, y)
end
Element 1 of the result is 0
Element 2 of the result is 4
Element 3 of the result is 12
Element 4 of the result is 24
Element 5 of the result is 40
Element 6 of the result is 60
Element 7 of the result is 84
Element 8 of the result is 112
Element 9 of the result is 144
Element 10 of the result is 180
function a=myf1(Att, A)
a=Att.*A;
end
function a=myf2(Att, A, ii)
a=Att(ii)*A(ii);
end