Make true all the false rows of a column of a matrix which are in between the first true and the last true row

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The first true element of column 1 of matrix a is at row 2. The last true element of column 1 of matrix a is at row 9. I want to get a matrix b whose 1st column will start with false, from row 2 to row 9 will b true and row 10 will be false. Likewise, I want to do the same for the rest of the columns of matrix a.
Example:
a =[
0 0 1 0
1 0 0 0
1 0 0 1
1 0 0 1
1 1 1 0
0 0 0 1
1 1 1 0
0 1 1 0
1 0 0 0
0 0 0 1];
b =[
0 0 1 0
1 0 1 0
1 0 1 1
1 0 1 1
1 1 1 1
1 1 1 1
1 1 1 1
1 1 1 1
1 0 0 1
0 0 0 1];

採用された回答

Andrei Bobrov
Andrei Bobrov 2013 年 6 月 16 日
b = cumsum(a)&flipud(cumsum(flipud(a)))

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