Replacing values in a matrix

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RickJ
RickJ 2020-4-5
评论： RickJ 2020-4-5
For a very large matrix of (1500000, 6) I wish to change the first 10 values in column 1 to 1, the next 10 values to 2, the next 10 to 3, etc.
Using for example:
X = randi([0,1],[1500000,6]);
To create the table.

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Tommy
Tommy 2020-4-5
Try this:
N = 1500000;
X = randi([0,1],[N,6]);
i = 1:N/10;
X(:,1) = repelem(i,10);

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