# How to remove rows with zeros in selected columns?

12 views (last 30 days)
Emma Kuttler on 24 Feb 2022
Edited: Scott MacKenzie on 24 Feb 2022
I have a matrix with 1363 rows and 21 columns. The first column is an identifier (1-21). I need to delete all rows that contain all zeroes with the exception of the first column. For example,
a = [ 1 0 5 0 6
2 0 0 0 0
3 3 5 9 12
4 0 0 0 0
5 6 9 1 0]
I want to produce b
b = [ 1 0 5 0 6
3 3 5 9 12
5 6 9 1 0]

Scott MacKenzie on 24 Feb 2022
Edited: Scott MacKenzie on 24 Feb 2022
There is probably a simpler solution, but this will work...
a = [ 1 0 5 0 6
2 0 0 0 0
3 3 5 9 12
4 0 0 0 0 ]
a = 4×5
1 0 5 0 6 2 0 0 0 0 3 3 5 9 12 4 0 0 0 0
zeroIdx = ~sum(~a(:,2:end) == 0,2);
a(zeroIdx,:) = []
a = 2×5
1 0 5 0 6 3 3 5 9 12

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