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Subject: | XploRe: Learning Guide |
See XploRe: |
Quantlet: | matrix04 | |
Description: | Extracting elements of a matrix. | |
Download: | matrix04.xpl |
; mat=(1|2|3|4)~(5|6|7|8)~(9|9|9|9) ; mat[1,] ; extract first row mat[,2] ; extract second column mat[4,3] ; extract element (4,3) ; mat[1:3,1|3] ; extract first rows 1 to 3 ; and columns 1 and 3 ; x = #(1,3,5)~#(2,4,6) index (x,#(3,2)) ; extract rows 3 and 2 ; x = #(4, 2, 5) ind = x > 3 ; indices of rows with elements > 3 paf(x, ind) ; select those form x ; x = #(4,2,5)~#(1,7,4) x sort(x,-2) ; sort x w.r.t. 2nd column, in ; descending order ; sort(x,0) ; sort columns independently
Subject: | XploRe: Learning Guide |
See XploRe: |