Generate N random number from weighted groups

Hi,

I am wanting to generate numbers from weighted groups, for example this could be a set of 10 numbers from the ranges 0:50 and 100:150.

I have tried

>> randsample([0:50, 100:150],10,true,[0.3 0.7])

But cannot seem to get the randsample function working for weighted groups, any help would be appreciated

Thanks

Answer 1

[KALYAN ACHARJYA]

w, of the same length as the vector population

randsample([0:50, 100:150],10,true,rand(1,102));
%.......................................102 vector population length (example)

Answer 2

[Steven Lord]

groupProbs = [0.3 0.7];
groupVal = rand(10, 1);
whichGroup = groupVal <= groupProbs(1); % for more groups, use discretize
results = zeros(size(whichGroup));
results(whichGroup == 1) = randi([0 50], nnz(whichGroup == 1), 1); % For more groups, for loop
results(whichGroup == 0) = randi([100 150], nnz(whichGroup == 0), 1);
finalResults = table(groupVal, results)

finalResults = 10x2 table
    groupVal    results
    ________    _______

     0.93344      114  
     0.64081      143  
     0.70705      132  
     0.16729        1  
     0.27142        8  
     0.31064      125  
     0.55051      148  
     0.34207      116  
     0.33953      120  
    0.070558       49