Mean between an interval

I want to calculate the mean between a time interval that depends on a variable like P ;

F=[1 10 2 4 6 8];

for q=1:length(F);

P=F(q);

Average=mean(M3(90000-P*0.2*1732:90000));

'' Integer operands are required for colon operator when used as index'' warning is come.. What is the problem here ?

[FG]

and how to solve it ?

Answer 1

[KSSV]

idx = round(90000-P*0.2*1732:90000) ; 
Average=mean(M3(idx));

Your indices are not integers.....you got some fractions also.....so use round.

Answer 2

[madhan ravi]

x = 1:5;
x(.2) % error
x(2) % no error , index can only be integers not decimals

I suggest you to do MATLAB Onramp course.

[FG]

OK, I will Madhan..