MATLAB: How to randomly generate 0.1 or -0.1

MATLABmatricesmatrix

Hello. Good day. I have this code:
        for sm=0:0.1:0.1                                                                                       
             f=sm*eye(N)                                    
        end
I get the following: f =
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
f =
    0.1000         0         0         0         0         0         0         0         0         0
         0    0.1000         0         0         0         0         0         0         0         0
         0         0    0.1000         0         0         0         0         0         0         0
         0         0         0    0.1000         0         0         0         0         0         0
         0         0         0         0    0.1000         0         0         0         0         0
         0         0         0         0         0    0.1000         0         0         0         0
         0         0         0         0         0         0    0.1000         0         0         0
         0         0         0         0         0         0         0    0.1000         0         0
         0         0         0         0         0         0         0         0    0.1000         0
         0         0         0         0         0         0         0         0         0    0.1000
I want to obtain the following: f =
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
     0     0     0     0     0     0     0     0     0     0
f =
    -0.1000         0         0         0         0         0         0         0         0         0
         0    0.1000         0         0         0         0         0         0         0         0
         0         0    -0.1000         0         0         0         0         0         0         0
         0         0         0    -0.1000         0         0         0         0         0         0
         0         0         0         0    0.1000         0         0         0         0         0
         0         0         0         0         0    0.1000         0         0         0         0
         0         0         0         0         0         0    0.1000         0         0         0
         0         0         0         0         0         0         0    -0.1000         0         0
         0         0         0         0         0         0         0         0    0.1000         0
         0         0         0         0         0         0         0         0         0    -0.1000
As we can see, we generated 0.1 and -0.1 randomly. That's what I want randomly generated 0.1 and -0.1 I hope I have explained my question well. Greetings and thanks.

Best Answer

diag((2*randi(0:1,1,N)-1)/10)
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