How to save a text file with number and text information?

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Guilherme Weber Sampaio de Melo 2024-3-1

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评论： Voss 2024-3-2

Hello, I have on my MATLAB code some variables containing values and filenames. Ex: lat1=1.2; lat2=3.2; long1=-44; long2=-34; grd=‘map.grd’; fault=‘fault.txt’; I would like to save one file in any output text format to be read by another code with a Shell code. Ex: file.txt containing all informations inside (1.2 3.2 -44 -34 map.grd fault.txt). I tried to use the writetable function as I have used before but it just work to values, it shows error when I tried to include the filenames (e.g map.grd). Does someone have any suggestion? Thanks in advance.

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Walter Roberson 2024-3-1

Possibly 'QuoteStrings', 'all' option to writetable() ?

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Answer 1

Voss 2024-3-1

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Put the filenames in cell arrays.

Example:

lat1=1.2; lat2=3.2; long1=-44; long2=-34; grd='map.grd'; fault='fault.txt';
% first, I generate the error you might have gotten:
try
    T = table(lat1,lat2,long1,long2,grd,fault) % doesn't work
catch e
    disp(e.message);
end
Invalid parameter name: map.grd.
% now, I put grd and fault in cell arrays:
T = table(lat1,lat2,long1,long2,{grd},{fault}) % works
T = 1×6 table
    lat1    lat2    long1    long2       Var5            Var6     
    ____    ____    _____    _____    ___________    _____________

    1.2     3.2      -44      -34     {'map.grd'}    {'fault.txt'}
% write the table to file:
writetable(T,'file.txt')
% check the contents of the txt file:
type file.txt
lat1,lat2,long1,long2,Var5,Var6
1.2,3.2,-44,-34,map.grd,fault.txt

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Voss 2024-3-2

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You're welcome! Since my answer solved the problem, don't forget to "Accept" it. Thanks!

For the second question, fprintf prints elements from the arguments you give it in order; in this case the order is long_final(1), long_final(2), ..., long_final(end), lat_final(1), lat_final(2), ... lat_final(end), with a newline after each 2 values.

Since you want the order to be long_final(1), lat_final(1), long_final(2), lat_final(2), ..., what you can do is put long_final and lat_final together in a matrix and send that to fprintf. When printing a matrix, fprintf prints down the first column first, then moves to the second column, etc., so each column should be one long value and one lat value, like this:

lat_final=[-1.1 -1.2 -1.3 -1.4];
long_final=[-34 -33 -32 -31];
fileID = fopen('final_coord.txt','w');
fprintf(fileID,'%6f %12f\n', [long_final; lat_final]);
fclose(fileID);
% check the file:
type('final_coord.txt')
-34.000000    -1.100000
-33.000000    -1.200000
-32.000000    -1.300000
-31.000000    -1.400000