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./
pp_isnumber.pro
Routines
top source pp_isnumber
result = pp_isnumber(istr [, nan=nan] [, infinity=infinity] [, trim=trim] [, integer=integer] [, blank=blank] [, all=all])
Tests a string to determine if it can be converted to a floating point number. All tests are case-insensitive. String must be trimmed on both sides: if it contains leading or trailing blanks, it is not considered a number.
Return value
True if str is a floating point number, or (optionally), NaN or Infinity.
False otherwise, including if str is undefined or is blank (unless the keyword blank is set).
Parameters
- istr in required
String or string array to test.
Keywords
- nan in optional default=1
If set, NaN is allowed as a number.
- infinity in optional default=1
If set, Infinity is allowed as a number (any of inf,infi,infin,infini,infinit,infinity).
- trim in optional default=1
If set, blanks on the string (on both sides) are ignored (a call is made to strtrim).
- integer in optional default=0
If set, will test for integer numbers, instead of real numbers.
- blank in optional default=0
If set, blanks are allowed as numbers
- all in optional default=0
If set and the input is an array, pp_isnumber will return a single 0 or 1, indicating whether every element in the array passed the test.
Examples
Test some simple cases:
print,pp_isnumber(['a','12','-1','1.8','.9','-.8e-3','NaN','infinity','a12'])
; 0 1 1 1 1 1 1 1 0
;print,pp_isnumber(['a','12','-1','1.8','.9','-.8e-3','NaN','infinity','a12'],nan=0,infinity=0)
; 0 1 1 1 1 1 0 0 0
print,pp_isnumber(['a','12','-1','1.8','.9','-.8e-3','NaN','infinity','a12'],/integer)
; 0 1 1 0 0 0 0 0 0
Author information
- Author:
Paulo Penteado (pp.penteado@gmail.com), Aug/2009
Other attributes
- Uses:
Statistics
| Lines: | 28 lines |
| Cyclomatic complexity: | 11 |
| Modified cyclomatic complexity: | 11 |
File attributes
| Modification date: | Wed Jun 29 22:15:28 2016 |
| Lines: | 28 |
| Docformat: | rst rst |