MATLAB: How to make an indicator function in loop

indicatorlogical?loop

Dear Community,
Hi, im learning Matlab and wondering how to create an indicator function that I can implement in for loop.
for example, y is 10 X 1 array that has "1","2","3" as its values. What I want to do in R version is
for i = 1: length(x)
ll[i] = ifelse(y[i] == 1, 1, 0) * log(p0) + ifelse(y[i]==2,1,0)*log(p1) + ifelse(y[i]==3,1,0)*log(p2)
like if y(i,:) is 1 then 1 else 0 and multiply log(p0) and if y(i,:) is 2 then 1 else 0 and multiply log(p1)
I wanna create another ll and save the caculated values from the loop. is there any nice way to substitute "ifelse" in the calculation?

Best Answer

You could do the following in Matlab:
   for i = 1:length(x)
   Y = y(i);
   ll(i) = log(p0)*(Y==1) + log(p1)*(Y==2) + log(p2)*(Y==3);
   end
Note that log is log to base e. log10 is log to base 10.
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