common data in two arrays

I have one array(c ) of 30Kx15 sixe and one structure array(r.data), 25Kx19 size. Need to find rows with similiar coloumn data from both arrays and join them. in a particular order. Using the following code. But found its too time taking. Can someone suggest effiicient code please

k=1;
for i=1:length(r.data)
    for j=1:length(cdataf)    
    if(r.data(i,3:9)==c(j,3:9))
    finaldata(k,:)=[c(j,1:9) r.data(i,10:13) c(j,10:15)];
    k=k+1;
    end
end
end

[Walter Roberson]

Look at ismember() with the 'rows' option.

[Lakshmi Chodavarapu]

Many thanks Mr.Walter Roberson. Helped me a lot.

[Ive J]

what about this tiny modification?

[loc, lor] = ismember(cdataf(:, 3:9), r.data(:, 3:9), 'rows');
rd = r.data(lor(loc), 3:9);

[Lakshmi Chodavarapu]

Many thanks. It worked out well. Grateful to you.