-
Notifications
You must be signed in to change notification settings - Fork 1
/
dbltostr.pro
136 lines (123 loc) · 5.31 KB
/
dbltostr.pro
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
;+
; NAME:
; DBLTOSTR
;
; PURPOSE:
;
; This is a program for converting a double precision numerical value
; to a string. It was originally offered by BioPhys on the IDL newsgroup.
;
; AUTHOR:
;
; FANNING SOFTWARE CONSULTING
; David Fanning, Ph.D.
; 1645 Sheely Drive
; Fort Collins, CO 80526 USA
; Phone: 970-221-0438
; E-mail: [email protected]
; Coyote's Guide to IDL Programming: http://www.idlcoyote.com
;
; CATEGORY:
;
; Utility
;
; CALLING SEQUENCE:
;
; stringValue = DblToStr(value)
;
; INPUTS:
;
; value - A double-precision or floating point value to be converted to a string.
;
; OUTPUTS:
;
; stringValue - The converted string value.
;
; KEYWORDS:
;
; None.
;
; RESTRICTIONS:
;
; Assumes 14 significant digits of precision.
;
; MODIFICATION HISTORY:
;
; Written by BioPhys and offered to the IDL newsgroup, 7 November 2005.
; Slightly modified and renamed by David Fanning, 30 November, 2005.
; Retired this program, and reincarnated it as cgDblToStr. 30 November, 2012. DWF.
;-
;
;******************************************************************************************;
; Copyright (c) 2005-2012, by Fanning Software Consulting, Inc. ;
; All rights reserved. ;
; ;
; Redistribution and use in source and binary forms, with or without ;
; modification, are permitted provided that the following conditions are met: ;
; ;
; * Redistributions of source code must retain the above copyright ;
; notice, this list of conditions and the following disclaimer. ;
; * Redistributions in binary form must reproduce the above copyright ;
; notice, this list of conditions and the following disclaimer in the ;
; documentation and/or other materials provided with the distribution. ;
; * Neither the name of Fanning Software Consulting, Inc. nor the names of its ;
; contributors may be used to endorse or promote products derived from this ;
; software without specific prior written permission. ;
; ;
; THIS SOFTWARE IS PROVIDED BY FANNING SOFTWARE CONSULTING, INC. ''AS IS'' AND ANY ;
; EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES ;
; OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT ;
; SHALL FANNING SOFTWARE CONSULTING, INC. BE LIABLE FOR ANY DIRECT, INDIRECT, ;
; INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED ;
; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; ;
; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ;
; ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT ;
; (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS ;
; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. ;
;******************************************************************************************;
FUNCTION DBLTOSTR, value
; Error handling.
On_Error, 2
IF N_Elements(value) EQ 0 THEN Message, 'Double precision or floaing value must be passed to the function.'
; Get the data type.
theType = Size(value, /Type)
IF theType NE 4 AND theType NE 5 THEN BEGIN
value = Double(value)
theType = 5
ENDIF
; Data extension.
typeExt = theType EQ 4 ? 'e' : 'd'
; Create a string, using the full-width G format.
rawstr = StrTrim(String(value, Format = '(g)'), 2)
; Extract the sign from the string and remove it for the moment.
sign = StrMid(rawstr, 0, 1) EQ '-' ? '-' : ''
rawstr = sign EQ '' ? rawstr:StrMid(rawstr, 1)
; Is there an exponent in the string? If so, remove that for the moment.
epos = StrPos(rawstr, 'e')
indx = epos gt -1 ? StrMid(rawstr, epos+1) : ''
rawstr = indx EQ '' ? rawstr:StrMid(rawstr, 0, epos)
; Find the position of the decimal point.
dpos = StrPos(rawstr, '.')
; Rounding process (assumes 14 significant digits).
outstr = StrArr(15)
FOR i = 0, 14 DO outstr[i] = StrMid(rawstr, i, 1)
aux = Fix(StrMid(rawstr, 16, 1)) GE 5?1:0
FOR i = 14, 0, -1 DO BEGIN
IF i NE dpos then BEGIN
sumstr = StrTrim(String(aux+fix(outstr[i])), 2)
sumlen = StrLen(sumstr)
outstr[i] = StrMid(sumstr, sumlen-1, 1)
aux = sumlen EQ 1 ? 0 : 1
ENDIF
ENDFOR
; Throw away '0's at the end.
ii = 14
WHILE outstr[ii] EQ '0' DO BEGIN
ii = ii-1
ENDWHILE
; Reconstruct the string.
saux = aux NE 0 ? '1' : ''
outstr = sign + saux + StrJoin(outstr[0:ii]) + typeExt + indx
; Return it.
RETURN, outstr
END