Merge strings and table to one text file using fprintf - Matlab

Question

How can I save the information generate in the script below which include strings and table in the following format to a text file?

Format:

M=5
1 21
2 22
3 23
4 24
5 25
5points

Script:

clc;
clear all;
close all;

ElmentsNum = "EM=5";
x = (1:5)';
y =(21:25)';
t = table(x,y);
M = "5points"
  
fileID = fopen('E:/Data.txt');
fprintf(fileID,'%s/n',ElmentsNum)
fprintf(fileID,'%.4f',t)
fprintf(fileID,'%s/n',M)
fclose(fileID)

clear all is very seldomly necessary. clear by itself clears all variables from the workspace, and is what you are attempting to do. clear all also unloads all previously loaded function definitions, meaning that they will all be loaded again when you use them, slowing down your code. — Cris Luengo
– Cris Luengo, Commented Oct 6, 2021 at 14:11

Ander Biguri · Accepted Answer · 2021-10-04 13:34:56Z

5

+25

Quite simple, just extract the values of the table, then write them line by line:

extracted_table=table2array(t);

fileID = fopen('Data.txt','w');
fprintf(fileID,'%s\n',ElmentsNum);
for ii=1:size(extracted_table,1)
%     fprintf(fileID,'%.4f %.4f\n',extracted_table(ii,:)); % if you want decimal places
    fprintf(fileID,'%d %d\n',extracted_table(ii,:)); % if you want integers (as in the example)
end
fprintf(fileID,'%s\n',M);
fclose(fileID);

answered Oct 4, 2021 at 13:34

Ander Biguri

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2 Comments

Wolfie Over a year ago

%g would give you "The more compact of %e or %f, with no trailing zeros" (from the docs) so that eases the %d/%.4f decision making :)

Ander Biguri Over a year ago

@Wolfie Good point! As often the code that reads the files may need X amount of floating point precision, I will leave my answer as is, but OP should definitely note your comment

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