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i am asking the user for a file and i wana transform that file into a matrix, i dont know how many lines or colums there is i only know that is a square matrix and that the numbers are seperated with space bar

Asked by vicente simas on 27 Nov 2018
Latest activity Edited by Image Analyst
on 28 Nov 2018
This is my code right now. My code only saves the last line of the file and saves it in an array aline. (I cannot use load or dlmread().
nme = input('nome do ficheiro >','s');
fid = fopen(nme,'r');
if fid == -1
disp('ficheiro nao encontrado');
else
while feof(fid)==0
aline=fgetl(fid);
end
closeresult=fclose(fid);
if closeresult==0
disp('ficheiro fechado com sucesso')
else
disp('erro')
end
end

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2 Answers

Answer by Jeremy Hughes on 27 Nov 2018
 Accepted Answer

T = readtable(filename,'Delimiter',' ');
A = T.Variables

  3 Comments

I thought using built in functions was not allowed. If readtable() is allowed, why aren't load() and dlmread() allowed? That's why I tried to fix/extend your code instead of doing it like a pro MATLAB programmer would do it. Who's forcing these crazy arbitrary restrictions on you anyway?
Maybe I missed part of this conversation. I didn't see a reference to his restrictions. There are restrictions when working on embedded systems.
If there are some limitations, I don't know if my solution will work in that context.
In his post at the top, it says
"(I cannot use load or dlmread()."
Usually such things are done by professors who want students to do things manually rather than use handy built-in functions because they want them to do it the long way, to learn it better I guess.

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Answer by Image Analyst
on 27 Nov 2018

Try this:
% Have user browse for a file, from a specified "starting folder."
% For convenience in browsing, set a starting folder from which to browse.
startingFolder = pwd; % or 'C:\wherever';
if ~exist(startingFolder, 'dir')
% If that folder doesn't exist, just start in the current folder.
startingFolder = pwd;
end
% Get the name of the file that the user wants to use.
defaultFileName = fullfile(startingFolder, '*.txt');
[baseFileName, folder] = uigetfile(defaultFileName, 'Select a file');
if baseFileName == 0
% User clicked the Cancel button.
return;
end
fullFileName = fullfile(folder, baseFileName)
fid = fopen(fullFileName,'rt');
lineCounter = 1;
if fid == -1
disp('ficheiro nao encontrado');
else
while feof(fid)==0
thisLine = fgetl(fid);
if ischar(thisLine)
allLines{lineCounter} = thisLine;
end
lineCounter = lineCounter + 1;
end
closeresult=fclose(fid);
if closeresult==0
disp('ficheiro fechado com sucesso')
else
disp('erro')
end
end
celldisp(allLines);

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