For Loop help for function input

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Pool
Pool 2022-12-1
评论： David Hill 2022-12-3
Hello,
I am trying to make a for loop to create inputs for a function, and store outputs - there are 4 inputs, and manually I would type in:
ones(4,1) in the function which is called main, so it looks in the input window as: main(ones(4,1))
This gives 4 outputs, which I would like to store in an excel file later on. However, I want to vary these inputs, and change all 4 of them to make 4^4 combinations (256) with two numbers (1 or 5). So for example:
[1 1 1 1];
[5 1 1 1];
[1 5 1 1];
[5 5 1 1];
[1 1 5 1]; ...................
as you can see, doing this manually is quite tedious - I know a for loop helps here and I can make 256 iterations run by
for i = 1:256
(this is main body)
.....
end
I am confused on whether I should have a nested loop to do this, and how I can store these values in separate rows for each iteration. Any help will be appreciated.

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采纳的回答

David Hill
David Hill 2022-12-2
Ran in:
r=randi(2,5,4);
r(r==2)=5
r = 5×4
1 1 5 5 1 1 5 1 5 1 1 1 1 5 1 5 1 1 5 5
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Pool
Pool 2022-12-3
You are right, sorry for the confusion haha - so if I was running a for loop for i = 1:16 iterations, and I get an output from another function, which gives out a 1x4 vector = [x1 x2 x3 x4] - and I want to store these into an empty matrix (zeros(16,4)), would I write:
for i = 1:16
s = (zeros(16,4));
r=randi(2,16,4);
r(r==2)=5;
x = main(r(i,:));
s(i,:) = x(1,:);
end
For some reason, this does not store the 1x4 outputs for me and gives an error
David Hill
David Hill 2022-12-3
Ran in:
s=zeros(16,4);
for i=1:16
r=randi(2,1,4);%assumed output from another function
r(r==2)=5;
s(i,:)=r;
end
s
s = 16×4
1 1 1 5 5 5 5 5 1 1 1 5 1 1 1 5 1 5 1 1 1 5 5 1 5 5 5 5 1 1 5 5 1 1 1 1 5 5 5 1

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