[2] | 1 | ;------------------------------------------------------------- |
---|
| 2 | ;+ |
---|
| 3 | ; |
---|
[142] | 4 | ; @file_comments |
---|
[163] | 5 | ; return position *array* for occurrence of a character in a string |
---|
[2] | 6 | ; |
---|
[142] | 7 | ; @categories |
---|
[157] | 8 | ; String |
---|
[2] | 9 | ; |
---|
[142] | 10 | ; @param STR {in}{required} |
---|
| 11 | ; the string |
---|
[2] | 12 | ; |
---|
[142] | 13 | ; @param SCHAR {in}{required} |
---|
| 14 | ; the character to look for |
---|
[2] | 15 | ; |
---|
[142] | 16 | ; @returns COUNT {out}{optional} |
---|
| 17 | ; The number of matches that were found |
---|
[2] | 18 | ; |
---|
[142] | 19 | ; The function returns an index array similar to the |
---|
| 20 | ; result of the where function |
---|
[2] | 21 | ; |
---|
[142] | 22 | ; @examples |
---|
[2] | 23 | ; ind = strwhere('abcabcabc','a') |
---|
| 24 | ; |
---|
| 25 | ; ; returns [ 0, 3, 6 ] |
---|
| 26 | ; |
---|
[142] | 27 | ; @history |
---|
[2] | 28 | ; mgs, 02 Jun 1998: VERSION 1.00 |
---|
| 29 | ; bmy, 30 Jun 1998: - now returns COUNT, the number |
---|
| 30 | ; of matches that are found (this is |
---|
| 31 | ; analogous to the WHERE command) |
---|
| 32 | ; |
---|
[142] | 33 | ; @version |
---|
| 34 | ; $Id$ |
---|
| 35 | ; |
---|
[2] | 36 | ;- |
---|
| 37 | ; Copyright (C) 1998, Martin Schultz, Harvard University |
---|
| 38 | ; This software is provided as is without any warranty |
---|
| 39 | ; whatsoever. It may be freely used, copied or distributed |
---|
| 40 | ; for non-commercial purposes. This copyright notice must be |
---|
| 41 | ; kept with any copy of this software. If this software shall |
---|
| 42 | ; be used commercially or sold as part of a larger package, |
---|
| 43 | ; please contact the author to arrange payment. |
---|
| 44 | ; Bugs and comments should be directed to mgs@io.harvard.edu |
---|
| 45 | ; with subject "IDL routine strwhere" |
---|
| 46 | ;------------------------------------------------------------- |
---|
| 47 | |
---|
| 48 | |
---|
| 49 | function strwhere,str,schar,Count |
---|
[114] | 50 | ; |
---|
| 51 | compile_opt idl2, strictarrsubs |
---|
| 52 | ; |
---|
[2] | 53 | |
---|
| 54 | |
---|
| 55 | if (n_elements(str) eq 0) then return,-1 |
---|
| 56 | |
---|
| 57 | ; convert to byte |
---|
| 58 | BStr = byte(Str) |
---|
| 59 | BSC = (byte(schar))[0] |
---|
| 60 | |
---|
| 61 | ; Search for matches |
---|
| 62 | Ind = where( Bstr eq BSC, Count ) |
---|
| 63 | |
---|
| 64 | ;### bmy ### return,where(BStr eq BSC) |
---|
| 65 | return, Ind |
---|
| 66 | |
---|
| 67 | end |
---|
| 68 | |
---|