Delete specific rows from a matrix

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

Answer 1

[Joseph Cheng]

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.

[Ron]

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

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

stands for ?

[Joseph Cheng]

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.

Answer 2

[Honglei Chen]

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