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Selecting columns with specific elements

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Shreya George
Shreya George 2021-2-2
评论： Shreya George 2021-2-3
I have a 3x2564 matrix with each row specifying the position coordinates of mesh elements of a 3D domain. I need to call the x-coordinate of elements along the free surface/upper face, with z=0. Is there a way to call out columns with the elements of the third row equal to zero? Or do I have to specifically call out each such element once I go through the 'p' matrix developed in the PDE toolbox?

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KALYAN ACHARJYA
KALYAN ACHARJYA 2021-2-2
编辑：KALYAN ACHARJYA 2021-2-2
"Is there a way to call out columns with the elements of the third row equal to zero?"
col_data=find(matrix(3,:)==0)
This col_data gives the column numbers, where 3 rd row elements equal to zero.

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