Random no matrix for 1 & -1

I want to generate a random matrix for which if element is < 0.5 it is equal to -1 and if >=0.5 its equal to 1 . kindly correct the code.......... I have attached....... Thanks

clc
clear all
format compact

nrows= 5
fm_array = rand(nrows)
if fm_array >= 0.5
    fm_array == 1
else
    fm_array == -1
   fm_array 
end

Answer 1

[Guillaume]

nrowcol = 5;
fm_array = rand(nrowcol);
fm_array(fm_array < 0.5) = -1;
fm_array(fm_array >= 0.5) = 1;

[Offroad Jeep]

Thanks..... will you like to work with me in magnetism.......

Answer 2

[James Tursa]

Another way:

fm_array = 1 - 2*(rand(nrows) < 0.5);