how to use a logical array to set logicals result for entire row.

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Matthew 2014-6-15

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https://ww2.mathworks.cn/matlabcentral/answers/134475-how-to-use-a-logical-array-to-set-logicals-result-for-entire-row

编辑： Cedric 2014-6-15

I have a matrix of nrows, with 3 columns. I am looking for an efficient way to use the 3rd column to select which rows i want to include in a new matrix. I want to be able to check if value of 3rd column is greater than 0.2. If it is, then I want to keep that row.

I think i would like to use a logical array, since i want to use that logical array on another variable. I was able to use this

vNormalsTopTest = vNormals>0.2

But, this applies the logical test to all columns. I would like to test the third column and apply that same logical result to the 1st and 2nd columns.

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Cedric 2014-6-15

编辑：Cedric 2014-6-15

在 MATLAB Online 中打开

Good start.

 isOkRow = vNormals(:,3) > 0.2 ;
 vNormals_reduced = ..

I let you think about the last step. Hint: you could use the vector of logicals isOkRow to index valid rows (logical indexing) of vNormals and something else to index all columns.

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