Filling a 3d matrix from columns

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Shane
Shane 2014-9-10
评论： Arjun Raja 2022-4-19
say we create a empty 3d matrix
A= zeros(30,30,361)
I have variable Pix, a 361 x 12 double matrix, were each column is the length of 361 data point. There are 12 samples columns, How would i randomly grab each column sample and fill the zeros matrix "A" so that all 361 data points in the 12 column lay on the matrix in 1 x 1 x 361 until it has filled all 30 x 30 positions.

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Joseph Cheng
Joseph Cheng 2014-9-10
so you can use randi(12,30,30) to generate a 30x30 matrix of values 1 to 12 to select which of the 12 columns to place in the row/column location. then use for loops to go through each index and specify the column.
example:
x = rand(361,12);
randcolumn = randi(12,30,30);
A = zeros(30,30,361);
for ind = 1:30
for jnd = 1:30
A(ind,jnd,:) = x(randcolumn(ind,jnd));
end
end
  1 个评论
Arjun Raja
Arjun Raja 2022-4-19
Kind of late but is there any way to do this without using a for loop?

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