MATLAB: Need Help Urgent!!!!!!!!!!!!

Question

i have this data in matrix X=[22,33,11,33,33,33,22]

i want to change the data with this form of matrix X=[22,33,22,33,33,33,44]

i have to follow this rules: 1)when find(X==33) next data must change into 22 2)when there have data "33" three times in row,the next data must change to 44

this is my example code for the looping: [a b]=find(X==33)

if X(a,b+1)-X(a,b)==1 if X(a,b+2)-X(a,b+1)==1 X(a,b+3)=44 end end

if X(a,b+1)-X(a,b)==2 X(a,b+2)=22 end

i know im doing this all wrong,can someone give a correct algorithm to get the answer that satisfied the rules.

Amir my email: noksworld@yahoo.com

Answer 1

You did not completely clarify, but here is a non-vectorized code that will do part of the job. Note that for this problem, it might be quicker to use a loop anyway.

cnt = 1;
Y = X==33;
while cnt <= length(X)-2
    if Y(cnt)
        if Y(cnt+1:cnt+2)  % Three in a row.
            X(cnt+3) = 44;
            cnt = cnt + 4;
        elseif Y(cnt+1) % Two in a row.
            X(cnt+2) = 11;
            cnt = cnt + 3;
        else  % Just one 33.
            X(cnt+1) = 22;
            cnt = cnt + 2;
        end
    else
        cnt = cnt + 1;
    end
end