Use parentheses to group the denominator together, and use the correct division operator:
x=sqrt((a*b*c)./(d*e*f))
And tested:
>> a = 1;
>> b = 2;
>> c = 3;
>> d = 4;
>> e = 5;
>> f = 1:0.1:10
f =
1.00000 1.10000 1.20000 1.30000 1.40000 1.50000 1.60000 ...
>> x = sqrt((a*b*c)./(d*e*f))
x =
0.54772 0.52223 0.50000 0.48038 0.46291 0.44721 0.43301 ...
Read about the differences between matrix and array operations:
Using basic arithmetic will make no sense until you learn these differences!
