For generating double numbers you can use:
r = rand( 1, 3 ,'double')
and to have them in a specific range you can use the following source: https://www.mathworks.com/help/matlab/math/floating-point-numbers-within-specific-range.html
which is:
a = 50;
b = 100;
r = (b-a).*rand(1000,1) + a;
thus, finally:
numElements = 10;
a = 0.2;
b = 1.2;
r= (b-a).*rand(1, numElements, 'double') + a; % [SL: added the missing "+a" term]
The result:
r
