Delete specific rows from a matrix

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Ron 2014-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/151360-delete-specific-rows-from-a-matrix

评论： Joseph Cheng 2014-8-18

采纳的回答： Joseph Cheng

Hi all,

i want to delete rows which with the values 1 in their columns, how can i do it ?

For example:

A= [7,7;2,2;1,1;3,3]

Becomes

A=[7,7;2,2;3,3]

Thank you !

P.s I've searched other posts before posting this .. couldn't find any help

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Answer 1

Joseph Cheng 2014-8-18

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https://ww2.mathworks.cn/matlabcentral/answers/151360-delete-specific-rows-from-a-matrix#answer_148972

编辑：Joseph Cheng 2014-8-18

在 MATLAB Online 中打开

the use of the function any() can find where there are any numbers equal to one.

A= [7,7;2,2;1,1;3,3]
A(any(A==1,2),:)=[]

by using the dimension modifier in the any() function, i can return which rows or columns contain the logical 1 which is when A ==1.

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Ron 2014-8-18

在 MATLAB Online 中打开

Thank you ! what the '2' in the code line

A(any(A==1,2),:)=[]

stands for ?

Joseph Cheng 2014-8-18

oh.. sorry meetings all day. the two is the dimension modifier. if you check the help for the any ('>>help any') the 2 stands for rows and 1 stands for columns. similar to the sum() function where you can sum a matrix in the row or column directions based on the dimension parameter.

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