function imag( z ) {
	return z.im;
}
Returns the imaginary component of a single-precision complex floating-point number.

@param {Complex} z - complex number
@returns {number} imaginary component

@example
var Complex64 = require( '@stdlib/complex/float32/ctor' );

var z = new Complex64( 5.0, 3.0 );

var im = imag( z );
// returns 3.0