column multiplication by specific number with some condition

r = -5 + (5+5)*rand(10,1) % column with positive and negative numbers

I want to create the function r_1 by satisfying the following:

r_1= r .* 0.5 if r >0

and

r_1 = r .* 0.7 if r<0

I guess, I should multiply positive values by 0.5 and negative values by 0.7.

Answer 1

[madhan ravi]

r_1=ones(1,numel(r)):
r_1(r>0)=r(r>0).*.5;
r_1(r<0)=r(r<0).*.7;
r_1

[Nazar Tarlanli]

r_1=zeros(size(r));
r_1(r>0)=r(r>0).*.5;
r_1(r<0)=r(r<0).*.7;
r_1

I did run this code,it work. Thanks

[madhan ravi]

Anytime :) make sure to accept the answer if it worked