Hi Ive got big matrixes with just few non missing data, and would like to use or do a funtion to find the index of the row and col of one specified value. For example I just have one "1" value in the matrix, and one "2" value in the same matrix. Has anyone an idea about how to extract the rowindex and colindex of the "1" value or the "2"? Thanks
finding cols and rows in a matrix
2 messages · javier garcia, Dimitris Rizopoulos
check this: mat <- matrix(rnorm(5*5), 5, 5) mat[1, 3] <- 1; mat[4, 2] <- 2 #### which(mat==1, TRUE) which(mat==2, TRUE) Best, Dimitris ---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/16/336899 Fax: +32/16/337015 Web: http://www.med.kuleuven.ac.be/biostat/ http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm ----- Original Message ----- From: "javier garcia" <rn001 at cebas.csic.es> To: <r-help at stat.math.ethz.ch> Sent: Thursday, April 28, 2005 12:55 PM Subject: [R] finding cols and rows in a matrix
Hi Ive got big matrixes with just few non missing data, and would like to use or do a funtion to find the index of the row and col of one specified value. For example I just have one "1" value in the matrix, and one "2" value in the same matrix. Has anyone an idea about how to extract the rowindex and colindex of the "1" value or the "2"? Thanks
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