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conditionally deleting matrix rows

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Abdelwahab Fawzy
Abdelwahab Fawzy 2016-7-13
评论： Image Analyst 2022-2-19
Hi all,
I wish to delete matrix rows according to a condition imposed over its columns. let assume the matrix is of 10x2 (rows x columns) size.
A= [16 45; 79 8; 31 23; 53 91; 17 15; 60 83; 26 54; 65 100; 69 8; 75 44]
I want to delete the row if either A(i,1) or A(i,2) is larger than 50
A= [16 45; 31 23; 17 15]

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Image Analyst
Image Analyst 2016-7-13
Try this:
A= [16 45; 79 8; 31 23; 53 91; 17 15; 60 83; 26 54; 65 100; 69 8; 75 44]
rowsToDelete = any(A>50, 2)
A(rowsToDelete,:) = []
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Romain Hautier
Romain Hautier 2022-2-19
Hello,
I know it has been a long time since you answered but I have an additional question. Is it possible to delete rows and colums satisfying a condition all at once? Say I have a matrix A = [1 2 3; 3 0 0; 1 2 0], would I be able to delete all rows and columns containing a 0 all at once to be left with A = [1]?
Thank you in advance.
Image Analyst
Image Analyst 2022-2-19
Ran in:
A = [1 2 3; 3 0 0; 1 2 0]
A = 3×3
1 2 3 3 0 0 1 2 0
rowsToDelete = any(A == 0, 2)
rowsToDelete = 3×1 logical array
0 1 1
columnsToDelete = any(A == 0, 1)
columnsToDelete = 1×3 logical array
0 1 1
A(rowsToDelete, :) = [];
A(:, columnsToDelete) = []
A = 1

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