Code following function?

om = if

How do I code this function? The requirements are that z is a matrix. Thanks.

x=[1:0.01:10]
y=x-4*sin(2*x)-4

Answer 1

[Shubham Gupta]

Try this:

z = zeros(size(y));
z(y>0) = 1;
z(y<0) = -1;

Answer 2

[Walter Roberson]

z = sign(y)

provided that y is real valued.