Scale 3D matrix by 10i

M = randi([5 10], 1);

N = randi([5 10], 1);

P = randi([20 30], 1);

Y = round(-10 + (10 - (-10)).*rand(M, N, P));

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indexes = 1:P;

scaling = repmat(indexes(:), [M, N, P])

Yscaled = Y.*(scaling.*10)

How I understand this question is that I have to create another 3D matrix and multiple the two (matrix) in order to scale it

How to I create a 3D matric: first page all 1 , second page all 2 , etc up to P

Answer 1

[Image Analyst]

Hint:

y=cat(3, ones(2), 2*ones(2), 3*ones(2)) % Sample initial data.

[rows, columns, planes] = size(y)
m = 10*(1:planes)
m2 = imresize(m', [numel(y), 1], 'nearest')
y_out = reshape(.......

Finish the last line by yourself and it will be done. imresize() requires the Image Processing Toolbox. Type ver to see if you have it.

Answer 2

[Johnny]

% Create a indexes vector

indexes = 1:P;

% Make indexes array into individual pages

n = reshape(indexes,1,1,P)

% Create a 3-dimensional matrix from indexes vector

m = repmat(n,M,N)

% Elementwise multiplication between matrix m and Y

Yscaled = Y.*(m.*10)

[Amit]

Very nice. You're getting a hang of MATLAB.

Answer 3

[Andrei Bobrov]

Yscaled = bsxfun(@times,Y,reshape(1:P,1,1,[])*10)