How to save max data of a time series data from simulink

I have an output from simulink of the following array. It calculates Kw value per 0.1 seconds i want to get total kw when "valid "array is 1 either in simulink or in matlab

valid=[0 0 0 0 0 0 1 1 1 1 1 1 0 0 0 0 0 1 1 1 0 0 0 ]
kwdata=[0 0 0 0 0 0 2 3 4 5 5 2  0 0 0 0 0  1 2 3 0 0 0]

Desired output

Desired output=[sum[2 3 4 5  5 2]   sum[1 2 3]]
Desiredout=[21 6]/0.1

Answer 1

[RSaha]

s=find(diff(valid)==1);
e=find(diff(valid)==-1);
Desiredout=[sum(kwdata(s(1):e(1))) sum(kwdata(s(2):e(2)))]/0.1;