I have a big matrix. Now I want to create a new matrix that takes the first value in each column and changes the following 11 values with the fist value. Then I want to take the value of the 13th row for each column and put in in the following 11 rows for each column.
An example for a column:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
I would like to change it to:
1 1 1 1 1 1 1 1 1 1 1 1 13 13 13 13 13 13 13 13 13 13 13 13
This would be an example for a small column. My matrix has the dimension of 253X7690.
Thank you for your help.
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