how can i delete an empty matrix

omar mahallawy

2019 3 15

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i used a function that would delete columns with any negative elements in them

i had 9 columns now i'm left with 6 columns

problem is that the 3 i purposly rejected come out as a Empty matrix: 321-by-0

how can i tell matlab to ignore this completly so i can work with the correct 6 columns ?

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madhan ravi 2019-3-15

illustrate with a short example

Guillaume 2019-3-15

在 MATLAB Online 中打开

We need a lot more details to understand what you're doing. Most likely, you're doing very something wrong. There's already a problem with the 2 lines you've shown, which should be:

idx = any(A < 0, 1);  %use ,1 to make sure you operate along the rows
A = A(:, ~idx);

"so all i wanted is to delete the empty matrix to continue with my code peacefully"

delete from what? From memory? If your code was expecting a variable and you've deleted from memory, it certainly won't continue peacefully. To me, this sounds like an XY problem where you've got a problem and ask us to fix it using a solution that is completely inappropriate (delete a matrix) instead of describing the real problem.

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