{smcl} {* 17apr2007}{...} {cmd:help mata mm_which()} {hline} {title:Title} {p 4 4 2} {bf:mm_which() -- Positions of nonzero elements} {title:Syntax} {p 8 12 2} {it:real vector} {cmd:mm_which(}{it:real vector v}{cmd:)} {title:Description} {p 4 4 2} {cmd:mm_which()} returns the position of the nonzero elements in {it:v}. {title:Remarks} {p 4 4 2}Example: {com}: x = uniform(10,1) {res} {com}: x {res} {txt} 1 {c TLC}{hline 15}{c TRC} 1 {c |} {res}.6942035381{txt} {c |} 2 {c |} {res}.9866539028{txt} {c |} 3 {c |} {res} .339872522{txt} {c |} 4 {c |} {res}.4785448909{txt} {c |} 5 {c |} {res}.1890356159{txt} {c |} 6 {c |} {res}.2186723398{txt} {c |} 7 {c |} {res} .495693512{txt} {c |} 8 {c |} {res}.7756144393{txt} {c |} 9 {c |} {res} .733696372{txt} {c |} 10 {c |} {res}.4224797708{txt} {c |} {c BLC}{hline 15}{c BRC} {com}: mm_which(x:>.5) {res} {txt}1 {c TLC}{hline 5}{c TRC} 1 {c |} {res}1{txt} {c |} 2 {c |} {res}2{txt} {c |} 3 {c |} {res}8{txt} {c |} 4 {c |} {res}9{txt} {c |} {c BLC}{hline 5}{c BRC}{txt} {title:Conformability} {cmd:mm_which(}{it:v}{cmd:)} {it:v}: 1 {it:x c} or {it:r x} 1 {it:result}: 1 {it:x c1} or {it:r1 x} 1. {title:Diagnostics} {p 4 4 2}{cmd:mm_which(0)} returns {cmd:J(0,0,.)}. {title:Source code} {p 4 4 2} {help moremata_source##mm_which:mm_which.mata} {title:Author} {p 4 4 2} Ben Jann, University of Bern, jann@soz.unibe.ch {title:Also see} {p 4 13 2} Online: help for {bf:{help mf_select:[M-5] select()}}, {bf:{help moremata}}