MATLAB: Formatting output text file problem

rtm4metext output fprintf

I am working on producing tributary pixels input file to GAMS and I need them to be numbered in a way that distinguishes 1.1 from 1.10 and 1.100. Is there a way to print a string of characters distinguishing these differences?
To make my question clearer I have a the structure shown below. The first column is pixel number and the second has pixels flowing into this pixel. I want to print this structure into a file such that 1.1 and 1.10 are two different pixels.
1.10000000000000  0
1.20000000000000  0
1.30000000000000  0
1.40000000000000  0
1.50000000000000  0
1.60000000000000  0 1.70000000000000  0 1.80000000000000  0 1.90000000000000  0 1.10000000000000  0
2.10000000000000  [1.10000000000000,0]
2.20000000000000  [1.20000000000000,0]
2.30000000000000  [1.30000000000000,0]
2.40000000000000  [1.40000000000000,0]
2.50000000000000  [1.50000000000000,0]
2.60000000000000  [1.60000000000000,0]
2.70000000000000  [1.70000000000000,0]
2.80000000000000  [1.80000000000000,0]
2.90000000000000  [1.90000000000000,0]
2.10000000000000  [1.10000000000000,0]
3.10000000000000  [2.10000000000000,0]
. . .
10.2000000000000  [10.1000000000000,9.20000000000000,0]
10.3000000000000  [10.2000000000000,9.30000000000000,0]
10.4000000000000  [10.3000000000000,9.40000000000000,0]
10.5000000000000  [10.4000000000000,9.50000000000000,0]
10.6000000000000  [10.5000000000000,9.60000000000000,0]
10.7000000000000  [10.6000000000000,9.70000000000000,0]
10.8000000000000  [10.7000000000000,9.80000000000000,0]
10.9000000000000  [10.8000000000000,9.90000000000000,0]
10.1000000000000  [10.9000000000000,9.10000000000000,0]
I used this code:
fid = fopen('UBNTrib_mariam1.txt', 'w');
fprintf('Neighboring Tribs List\n');
fprintf('pixel,Num tribs, Tributaries');
for k=1:size(tribarray,2)
num2str(tribarray(k).pixel),num2str(tribarray(k).trib));
fprintf(fid, '%s, %s, %s\n', num2str(tribarray(k).pixel), num2str(size(tribarray(k).trib,2)));
for j = 1:size(tribarray(k).trib,2)
fprintf(fid, '%s,', num2str(tribarray(k).trib(j)));
end
fprintf(fid, '\n');
end
fclose(fid);
% view the contents of the file type UBNTrib_mariam1.txt;
'done'
However the output is: Neighboring Tribs List pixel,Num tribs, Tributaries
1.1, 1, 0,
1.2, 1, 0,
1.3, 1, 0,
. . .
10.1, 3, 10.9,9.1,0,
so the last line for instance should be : 10.10 , 3 , 10.9, 9.10,0
Thanks a lot, Mariam

Best Answer

Store your row and column data separately. There is no difference between 1.1 and 1.10 when it is stored as a floating point number, unless you store some kind of separate meta-data about each number... which would be more hassle than simply storing the row and column data separately.
Your easiest choice by far is to keep the row and column separate, and print then (if required) using Kelly's / Guillaume's solution to your earlier question:
fprintf('%d.%d', row, col)
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