matrix

Hi all,

Assume I have a matrix
xv= ?[1 0 0 0 0 12,
? ? ?0 1 0 0 0 10,
?* ? ?0 0 1 0 0 -9,*
? ? ?0 0 0 1 0 20,
? ?* ?0 0 0 0 1 -5]*

if the last column of "xv" ?less than ?0 then I want to set zero the entire
row.
The desired output looks like the following. In this case row 3 and row 5
are set zero.

? ?[ 1 0 0 0 0 12,
? ? ?0 1 0 0 0 10,
? ? * 0 0 0 0 0 0,*
? ? ?0 0 0 1 0 20,
? ?* ?0 0 0 0 0 0*]

I used ifelse command but did not work

Is there another command to do that?

Thanks in advance
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