MATLAB: How to avoid overwriting of values in 2nd for loop and store all the results

for loopoverwriting

fid=fopen('test1.tsv');
ftext=textscan(fid, '%s%s%s%s%s%s%s');
chr = ftext(1);
ref = ftext{4};
alt = ftext{5}; 
siz_x=size(chr);
for i = 1:siz_x(1,1)
    x_i = chr{i};
    idx1 = strmatch('chr1', x_i, 'exact');
    sz_idx1 = size(idx1);
    i
end
for j = 1:sz_idx1(1,1)
   new_idx = idx1(j);
    ref_i = ref{new_idx};
    idx5 = strmatch('A', ref_i, 'exact');
    sz_idx5 = size(idx5);
    j
end

Best Answer

fid=fopen('test1.tsv');
ftext=textscan(fid, '%s%s%s%s%s%s%s');
chr = ftext(1);
ref = ftext{4};
alt = ftext{5}; 
siz_x=size(chr);
sz_idx1 = zeros(siz_x(1,1),2);
for i = 1:siz_x(1,1)
    x_i = chr{i};
    idx1 = strmatch('chr1', x_i, 'exact');
    sz_idx1(i,:) = size(idx1);
    i
end
sz_idx5 = zeros(sz_idx1(1,1),2)
for j = 1:sz_idx1(1,1)
   new_idx = idx1(j);
    ref_i = ref{new_idx};
    idx5 = strmatch('A', ref_i, 'exact');
    sz_idx5(j,:) = size(idx5);
    j
end
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