Using fprintf to print in text file

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Sung Yeob Lim
Sung Yeob Lim 2019-9-22
评论： Sung Yeob Lim 2019-9-27
Hi all,
I'm very very unfamiliar with MATLAB. I've been trying to write a code that can neatly organize the data that is stored in certain variables into a text file.
What I want the final product to look like is this:
Each column is stored in separate variables (e.g. nodeID=[1;2;3;4], X=[0;0;120;120], etc)
I've been trying to use frpintf function and got to where there is a breakline between the column titles and the numbers.
I'd like to know how to evenly space these numbers as shown in the picture. Currently I've been adding spaces (using ' ') via fprintf but this gives me something that looks like below:
the code i have is the following (it's embarrassing really):
here nNode = 4,
for i = 1:nNode
fprintf(txt,'\n');
fprintf(txt, '%d', nodeID(i));
fprintf(txt, ' ');
fprintf(txt, '%.2f', X(i));
fprintf(txt, ' ');
fprintf(txt, '%.2f', Y(i));
fprintf(txt, ' ');
fprintf(txt, '%.3f', fx(i));
fprintf(txt, ' ');
fprintf(txt, '%.3f', fy(i));
end
Is there a more efficient way to go about this issue?
Thanks a bunch :)
  2 个评论
Image Analyst
Image Analyst 2019-9-22
txt is the name of the file handle, right? That's probably a bad name for it since we might think it's a text string.
So you did
txt = fopen('Nodal Data.txt', 'wt');
before any of the code you're showing, right? Personally I'd use fid, fileID, or fileHandle as the handle to the file - it's a more descriptive name.
Sung Yeob Lim
Sung Yeob Lim 2019-9-22
编辑：Sung Yeob Lim 2019-9-22
this is what i wrote
txt = fopen('output.txt','wt','n');
And thanks for the tip! I'll change it to fid :)

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采纳的回答

Athul Prakash
Athul Prakash 2019-9-25
编辑：Athul Prakash 2019-9-25
Hey Sung,
Instead of printing a fixed number of spaces with ' ', you may set the total width of your value in the format string like this:
sprintf('%10.2f %10.2f', 120, 120) %Each value of 120 is displayed with total width 10 and precision 2.
Use '%w.2f' to set the width of the display value to 'w', which would fill in empty spaces as required.
This would align values in a column on the rightmost digit.
[I used 'w' to illustrate only. You can't use a variable this way, you will need to replace 'w' with your required number, say '%15.2f' or '%20.2f']
[sprintf and fprintf both work the same way, I used sprintf just to demonstrate]
Hope it helps!

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