Delete Rows of an Array where a given column is less (or greater) than a given value

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Douglas Anderson 2015-5-22

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https://ww2.mathworks.cn/matlabcentral/answers/218197-delete-rows-of-an-array-where-a-given-column-is-less-or-greater-than-a-given-value

编辑： William McMillan 2019-2-22

采纳的回答： Star Strider

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Hello!

With an array like this:

A=     4     2     3
       1     6     5
       1     2     9
       5     2     2
       1     2     6

I would like to have an array with (for example) column 3 less than 5. I know that sortrows(A,3) can get the rows in order, but what is the (logical?) test to eliminate these rows?

Thanks!

Doug

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Douglas Anderson 2015-5-22

Just to be clear! I mean that the VALUE of column 3 is less than 5!

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采纳的回答

Star Strider 2015-5-22

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https://ww2.mathworks.cn/matlabcentral/answers/218197-delete-rows-of-an-array-where-a-given-column-is-less-or-greater-than-a-given-value#answer_180115

编辑：Star Strider 2015-5-22

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To eliminate the rows with the value of column 3 less than 5, keep those with the value of column 3 greater than or equal to 5:

A = A(A(:,3) >= 5, :)

similarly:

A(A(:,3) < 5, :) = []

will both produce:

A =
       1     6     5
       1     2     9
       1     2     6

Is this what you want to do?

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WENDY ZHANG 2019-1-8

Really helpful!

William McMillan 2019-2-22

编辑：William McMillan 2019-2-22

I have a 39801x7 array and i would like to keep any row that has a value greater than 5 or value less than -5. How would I do this?

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