returns the sign of a vector of real of complex values
s = csgn(z)
a vector of values on which we want to compute the sign
if the real part is not equal to zero:
+1
if the real part of an element is positive
-1
if the real part of an element is negative
If the real part is equal to zero:
+1
if the imaginary part of an element is positive
-1
if the imaginary part of an element is negative
if the element is equal to zero, then returns %nan
The csgn
function returns the sign of a vector of real of complex values z
.