How can I fill everything below the white thing line in this image?

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Love Matlab
Love Matlab 2020-6-17
评论： Image Analyst 2020-6-18
In the image I have attached, how can I fill the entire area below the thin white line plotted? Thank you!

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Matt J
Matt J 2020-6-17
By adapting the following smaller example,
A =
1 0 0 0 0 0 0 0
0 1 0 0 0 0 0 0
0 0 1 0 0 0 0 0
0 0 0 1 0 0 0 0
0 0 0 0 1 0 0 0
0 0 0 0 0 1 1 1
0 0 0 0 0 0 0 0
0 0 0 0 0 0 0 0
>> B=cummax(A,1)
B =
1 0 0 0 0 0 0 0
1 1 0 0 0 0 0 0
1 1 1 0 0 0 0 0
1 1 1 1 0 0 0 0
1 1 1 1 1 0 0 0
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1
1 1 1 1 1 1 1 1

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