Set multiple rows and single column at the same time in Matrix

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Hi,

i'd like to know how to set multiple rows and single column at the same time in Matrix.

Ex:

Mat my_matrix = Mat::zeros(100, 4, CV_32S);

suppose that I want to set:

• rows 0-24 column 1 as 1;
• rows 25-49 column 2 as 1;
• rows 50-74 column 3 as 1;
• rows 75-99 column 4 as 1;