isreal

isreal — check if a variable as real or complex entries

Calling sequence

t=isreal(x)  
t=isreal(x,eps)

`x`	: vector or matrix with floating point entries or coefficients
`t`	: a boolean

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 if less or equal than eps.



isreal([1 2])
isreal(1+0*%i)
isreal(1+0*%i,0)
isreal(1+%s)
isreal(sprand(3,3,0.1))