Issues with order that fprintf prints data

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Peyton Jay
Peyton Jay 2021-3-22
评论： Peyton Jay 2021-3-22
I am trying to print a matrix to a .txt file using fprintf. The code I have written looks like this:
fprintf(fileName,'Header\r\n\r\n');
fprintf(fileName,'%f %f\r\n',matrix);
The matrix looks something like this:
matrix = 1 1
2 2
3 3
I want the code to print out exactly what is in the matrix, but instead it is going down each collumn to populate the rows in the text file, like this:
Header
1 2
3 1
2 3
Any ideas as to why this is occuring?

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Cris LaPierre
Cris LaPierre 2021-3-22
编辑：Cris LaPierre 2021-3-22
Ran in:
MATLAB stores the data in column-major order by default. The simplest way is to address this is to transpose matrix.
matrix = [1 1; 2 2; 3 3];
fprintf('%f %f\r\n',matrix');
1.000000 1.000000 2.000000 2.000000 3.000000 3.000000
You might also consider using writetable (includes table variable names) or writematrix. It could simplify your code, and will handle writing a table/matrix as expected.
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Cris LaPierre
Cris LaPierre 2021-3-22
Ran in:
What do your headers look like?
If they could be variable names, consider using a table. Try this example.
matrix = [1 1; 2 2; 3 3];
Tmatrix = array2table(matrix);
Tmatrix.Properties.VariableNames = ["Apples","Oranges"]
Tmatrix = 3×2 table
Apples Oranges ______ _______ 1 1 2 2 3 3
With the data formatted correctly as a table, now use writetable(Tmatrix,filename,'Delimiter'," ") to create your file.

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