How can I shuffle a matrix?

I have a matrix M of 10000 x 4, I want to shuffle the numbers. After that ill be calculating the median But I keet getting an error

M = 10000 x 4 matrix

ExampleFunction(M, 2)

function [] = ExampleFunction(d3, k3)

for i = 1:d3

[~, n3] = size(d3);

idx3 = randperm(n3);

randM3 = d3;

randM3 = (1, idx3) = d3(1, :);

end % for i

disp(randM3)

% Median

for j = 0:length(randM3)

mid3 = randM3(ceil(end/2), :);

end% for j

disp(mid3)

end % Function

Error:

Unrecognized function or variable 'randM3'.

Error in:

for j = 0:(randM3)

I have 2 other matrixes in different functions running in the same method as above with no error, I don't know why I have an error in this one.

Answer 1

[Scott MacKenzie]

Looking only at your question (How can I shuffle a matrix?), here's one option:

M = [1:5; 6:10; 11:15]
r = randperm(numel(M));
M = M(reshape(r, size(M,1), []))

Output:

M =

1 2 3 4 5

6 7 8 9 10

11 12 13 14 15

M =

9 11 13 6 14

10 5 4 3 8

7 2 12 15 1

[Whale Chicken]

THIS WORKED, THANK YOU SOOO MUCH!!!