Scilab 5.5.2
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Please note that the recommended version of Scilab is 2025.0.0. This page might be outdated.
See the recommended documentation of this function
isnum
tests if a string represents a number
Calling Sequence
res = isnum(str)
Arguments
- str
a character string or a matrix of character strings.
- res
a boolean matrix.
Description
res = isnum(str)
returns %t
if
str
represents a number.
isnum
does not handle "operations", but only pure scalar numbers.
For instance, isnum("1+2*3")
will return %f
.
Complex numbers are not concerned, because one complex number is defined by the addition of two parts.
Examples
isnum(['1' , .. '-1.23' , .. '+1e+23' , .. '1d+23' , .. 'A' , .. '%e' , .. '%pi' , .. '%nan' , .. 'Nan' , .. '%inf' , .. 'Inf' , .. '1+%i*2' , .. '%eps-%eps*%i', .. '%inf+Nan*%i' ])
See Also
- isletter — check that characters of a string are alphabetic letters
- isdigit — check that characters of a string are digits between 0 and 9
- isalphanum — check that characters of a string are alphanumerics
- evstr — evaluation of expressions
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