real real part of complex numbers, polynomials, or rationals

## Syntax

    y = real(x)

## Arguments

x

  matrix of real or complex numbers (full or sparse storage), or of polynomials or rationals with real or complex coefficients.

y

  matrix of real numbers, polynomials or rationals, with same sizes than `x`.

## Description

`real(x)` components are the real part of related `x` components (See `%i` to enter complex numbers).

## Examples

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

    // With polynomials:
    A = [1-%i*%z (%z-%i)^2]
    real(A)

    // With rationals:
    A = [ %z/(1-%z)  (1-%z)/%z^2];
    B = A(1,[2 1])
    C = A + %i*B
    A, real(C)

## See also

- imag

## History

6.0 Extension to rationals