How to load numbers from a text file to a .mat file?
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I have a text file in the following format. How can I load it to a .mat file in its present form?
5
3
3 2 3 4
2 -1 5
3 1 -3 -4
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Walter Roberson
2022년 1월 6일
The only way to get it "exactly like it comes from the file" is in text form.
MATLAB does not have any way to represent arrays that have varying numbers of columns per row (or varying number of rows per column.) There is no way, in MATLAB, to represent "holes" -- you cannot, for example, have a matrix
3 2 3 4
2 -1 5 <hole>
3 1 -3 -4
The closest you can get would be to put NaN in the empty locations.
채택된 답변
Walter Roberson
2022년 1월 6일
filename = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/855395/text.txt';
data = readmatrix(filename)
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Walter Roberson
2022년 1월 6일
filename = 'https://www.mathworks.com/matlabcentral/answers/uploaded_files/855395/text.txt';
opts = detectImportOptions(filename);
opts.DataLines = [1 inf];
data = readmatrix(filename, opts)
추가 답변 (2개)
Mathieu NOE
2022년 1월 6일
hi
maybe this
(I assumed you want each individual value stored in a cell)
the cell array can be of course saved to a mat file
a = readcell('data.txt',"Delimiter"," ")
a = 5×4 cell array
{[5]} {1×1 missing} {1×1 missing} {1×1 missing}
{[3]} {1×1 missing} {1×1 missing} {1×1 missing}
{[3]} {[ 2]} {[ 3]} {[ 4]}
{[2]} {[ -1]} {[ 5]} {1×1 missing}
{[3]} {[ 1]} {[ -3]} {[ -4]}
save test.mat a
Voss
2022년 1월 6일
You can read the file into a character array called text and save it to a .mat file:
% read characters from text file:
fid = fopen('text.txt');
text = fread(fid,'*char').';
fclose(fid);
% save to mat:
save('text.mat','text');
Then load the .mat file to check that it is the same as the text file:
S = load('text.mat');
disp(S.text);
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