Saving output of for loop in array

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Raphael Williams
Raphael Williams 2018-9-28
评论： Aquatris 2018-9-28
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

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回答（2 个）

Aquatris
Aquatris 2018-9-28
编辑：Aquatris 2018-9-28
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)"
  2 个评论
Raphael Williams
Raphael Williams 2018-9-28
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
Aquatris 2018-9-28
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

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Stephen23
Stephen23 2018-9-28
编辑：Stephen23 2018-9-28
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,[])

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