I want to use a for loop inside a function, where the for loop contains a subfuction. Each loop must store the variable value and make a matrix of all values, but I get 0s :(

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function [a] = Main(Coordinates)
a=5;
for n=1:a
Coordinates=3+n;
a= test(n,Coordinates)
end
end
function [A, B]= test(n,Coordinates)
A(n)= Coordinates*3;
B(n)= A(n)*Coordinates*6;
end
  3 Comments
Geoff Hayes
Geoff Hayes on 17 Jun 2022
That makes sense, right? Look at this code
function [A, B]= test(n,Coordinates)
A(n)= Coordinates*3;
B(n)= A(n)*Coordinates*6;
end
You are creating a new A and B whenever the test function is called. These new variables/arrays won't have the history from previous calls to this function. So you are always returning arrays of zeros except for the nth value which is set in this function call.

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Accepted Answer

Geoff Hayes
Geoff Hayes on 17 Jun 2022
@Nikolas Katsantonis - you are using a as an integer and as a result from test
a=5;
for n=1:a %<--- a as integer
Coordinates=3+n;
a= test(n,Coordinates) %<--- a as result
end
test should be returning two values and not arrays (you will need to correct this code), and so you would do something like
a=5;
for n=1:a
Coordinates=3+n;
[aValue, bValue] = test(n,Coordinates);
end
then store aValue into an array so that you don't overwrite it on each iteration of the loop
a=5;
myData = zeros(a,1);
for n=1:a
Coordinates=3+n;
[aValue, bValue] = test(n,Coordinates);
myData(n) = aValue;
end
then return myData in the signature of your function (not a).
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