Name
isreal — check if a variable as real or complex entries
Calling Sequence
t=isreal(x)
t=isreal(x,eps)
Parameters
- x
vector or matrix with floating point entries or coefficients
- t
a boolean
Description
isreal(x)
returns true if x
is stored as a real variable and
false if x
is stored with an (eventually zero) imaginary part.
isreal(x,eps)
returns true if x
is stored as a real variable or
if maximum absolute value of imaginary floating points is less or equal
than eps
.
Examples
isreal([1 2])
isreal(1+0*%i)
isreal(1+0*%i,0)
isreal(1+%s)
isreal(sprand(3,3,0.1))