Saving output of for loop in array

Hi, I am trying to save the output of my for loop in an array. Each output will consist of permutations of a previously defined array. I need to save the new array as consisting of my output in a single array.

The code is

Pload = linspace (1,2,4) 

For i= eye(10)
    P=Pload(randperm(length(Pload)
End

Now I'm trying to save the output in a new matrix.

Trying

Pnew(i,:)=P 
Returns an error "index in position I is invalid"

Kindly help

Answer 1

[Aquatris]

There are some mistakes and unclear parts in your code. However, using your code, you can save it as;

Pload = linspace (1,2,4) 
for i= 1:10
    P(i,:)=Pload(randperm(length(Pload)))
end

Unclear part: why are you calling "randperm" function with "length(Pload)" why are you calling "for i = eye(10)"

[Raphael Williams]

Thanks for the response. The objective is to vary the values of the variable Pload 10 times while keeping the initial array structure of Pload intact. Hence since Pload is 1×4, and varied 10 times. I intend on storing the output as 1×40. I want to randomly change the position of each element after a loop, but I want the values to remain unchanged. Defining a solution space but rotating the position

[Aquatris]

So since you want to convert the 1x4 to 1x40, you should do something like ;

Pload = linspace (1,2,4);
for i= 1:10
    index(1+(i-1)*length(Pload):i*length(Pload)) = randperm(length(Pload));
end
Pnew = Pload(index);

Since the Pnew are possible solutions, it might be more convenient to store it as 10x4 matrix instead, in which case you can use below code;

for j =1:10;
  Pnew2(j,:) = Pload(index(1+(j-1)*length(Pload):j*length(Pload)));
end

Answer 2

[Stephen23]

Pload = linspace(1,2,4);
N = numel(Pload);
P = repmat(Pload,10,1);
for k = 1:10
    P(k,:) = P(k,randperm(N));
end
P = reshape(P.',1,[])