[2] | 1 | ; $Id$ |
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| 2 | ;------------------------------------------------------------- |
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| 3 | ;+ |
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| 4 | ; NAME: |
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| 5 | ; STRWHERE (function) |
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| 6 | ; |
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| 7 | ; PURPOSE: |
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| 8 | ; return position *array* for occurence of a character in |
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| 9 | ; a string |
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| 10 | ; |
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| 11 | ; CATEGORY: |
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| 12 | ; string tools |
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| 13 | ; |
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| 14 | ; CALLING SEQUENCE: |
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| 15 | ; pos = STRWHERE(str, schar [,Count] ) |
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| 16 | ; |
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| 17 | ; INPUTS: |
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| 18 | ; STR -> the string |
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| 19 | ; |
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| 20 | ; SCHAR -> the character to look for |
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| 21 | ; |
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| 22 | ; KEYWORD PARAMETERS: |
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| 23 | ; none. |
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| 24 | ; |
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| 25 | ; OUTPUTS: |
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| 26 | ; COUNT -> (optional) The number of matches that were found |
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| 27 | ; |
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| 28 | ; The function returns an index array similar to the |
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| 29 | ; result of the where function |
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| 30 | ; |
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| 31 | ; SUBROUTINES: |
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| 32 | ; |
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| 33 | ; REQUIREMENTS: |
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| 34 | ; |
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| 35 | ; NOTES: |
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| 36 | ; |
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| 37 | ; EXAMPLE: |
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| 38 | ; ind = strwhere('abcabcabc','a') |
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| 39 | ; |
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| 40 | ; ; returns [ 0, 3, 6 ] |
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| 41 | ; |
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| 42 | ; MODIFICATION HISTORY: |
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| 43 | ; mgs, 02 Jun 1998: VERSION 1.00 |
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| 44 | ; bmy, 30 Jun 1998: - now returns COUNT, the number |
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| 45 | ; of matches that are found (this is |
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| 46 | ; analogous to the WHERE command) |
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| 47 | ; |
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| 48 | ;- |
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| 49 | ; Copyright (C) 1998, Martin Schultz, Harvard University |
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| 50 | ; This software is provided as is without any warranty |
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| 51 | ; whatsoever. It may be freely used, copied or distributed |
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| 52 | ; for non-commercial purposes. This copyright notice must be |
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| 53 | ; kept with any copy of this software. If this software shall |
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| 54 | ; be used commercially or sold as part of a larger package, |
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| 55 | ; please contact the author to arrange payment. |
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| 56 | ; Bugs and comments should be directed to mgs@io.harvard.edu |
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| 57 | ; with subject "IDL routine strwhere" |
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| 58 | ;------------------------------------------------------------- |
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| 59 | |
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| 60 | |
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| 61 | function strwhere,str,schar,Count |
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| 62 | |
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| 63 | |
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| 64 | if (n_elements(str) eq 0) then return,-1 |
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| 65 | |
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| 66 | ; convert to byte |
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| 67 | BStr = byte(Str) |
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| 68 | BSC = (byte(schar))[0] |
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| 69 | |
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| 70 | ; Search for matches |
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| 71 | Ind = where( Bstr eq BSC, Count ) |
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| 72 | |
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| 73 | ;### bmy ### return,where(BStr eq BSC) |
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| 74 | return, Ind |
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| 75 | |
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| 76 | end |
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| 77 | |
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