if statement - MATLAB - How to create output for each iteration of a looped calculation -

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this calculation aims take value (a) , perform 1 of 2 calculations on each iteration of loop. each sequential loop takes new calculated value , recalculates it. keep outputted value each loop. here example, using logical array decide calculation use on each of 5 loops:

a = 0; b = logical([1 0 1 1 0]);  = 1:length(b)     if b(i) == 1         = 1*2 + a*2     else         = a*3     end end

this example not correct returns 1 value a rather 5. desired result example is:

a = 2 6 14 30 90

please me , amend else wrong here. many thanks.

you can do

a = [0]; b = logical([1 0 1 1 0]);  = 1:length(b)     if b(i) == 1         a(end+1) = 1*2 + a(end)*2;     else         a(end+1) = a(end)*3;     end end

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