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' ]) |  |  |
tests if a string represents a number
res = isnum(str)
a character string or a matrix of character strings.
a boolean matrix.
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.
isnum(['1' , .. '-1.23' , .. '+1e+23' , .. '1d+23' , .. 'A' , .. '%e' , .. '%pi' , .. '%nan' , .. 'Nan' , .. '%inf' , .. 'Inf' , .. '1+%i*2' , .. '%eps-%eps*%i', .. '%inf+Nan*%i' ]) | | |