Move the coordinate=[] line inside the first loop:
for t = 1:numel(i)
coordinate = [];
... the rest of your code
end
Even better would be to get rid of the inner loop. If you had saved the data in non-scalar structure this would be trivial, but because you appear to have scalar structure in a cell array it is more complex, but something like this should work:
P = 'C:\Users\length';
V = 1:6;
for kk = 1:numel(V)
F = sprintf('snakes_frame%u.mat',V(kk)); % better than NUM2STR.
S = load(F);
S = [S.snakes{:}]; % convert ugly cell-of-scalar-structures to one non-scalar structure.
coordinate = reshape([S.x;s.y],1,[]);
G = sprintf('coordinate%u.mat',kk);
save(fullfile(P,G),'coordinate');
end
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