MATLAB: Make a vector from one value

MATLABvector

hello! I have values 0.421, I need to make a vector of 1200 values of the same from it without a loop

% I need to do without a loop x=[0.421 0.421 0.421 0.421 ...]

One way (among many)

x = 0.421 + zeros(1,1200)

Probably the easiest way is to do exactly that:

CumProb = [0.1579    0.2105    0.3158    0.4211    0.5263    0.7895    1.0000];
CumProb = [0 CumProb];

Another option:

newCumProb = zeros(1,size(CumProb,2)+1);
newCumProb(2:end) = CumProb;

Hint

    M = magic( 7 );
    R = M( randperm(7), : );