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adding headers when using fprintf to write to text

Danielle Leblance さんによって質問されました 2016 年 12 月 30 日
最新アクティビティ Image Analyst
さんによって コメントされました 2016 年 12 月 31 日
Hi,
I am writing a matrix to text using the following codes:
fid = fopen('Datav1Call_1993.txt','w+');
for idx = 1:size(DataPaper,1)
line = DataPaper(idx,~isnan(DataPaper(idx,:))); % creates the line of data without NaNs
fprintf(fid,[repmat('%d ',1,length(line)),'\n'],line);
end
fclose(fid);
how can i add headers to the columns?

  1 件のコメント

dpb
2016 年 12 月 30 日
Write 'em before the loop after you open the file...result will likely be more satisfactory for looking at if you use widths on the field specifications to line things up...

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1 件の回答

Image Analyst
回答者: Image Analyst
2016 年 12 月 30 日
 採用された回答

For example, after fopen() and before the loop:
if fid == -1
errorMessage = sprintf('Error opening Datav1Call_1993.txt')
uiwait(errordlg(errorMessage));
return; % Bail out
end
% Now write header string.
fprintf(fid, 'header 1 header 2 header 3 whatever \n');

  6 件のコメント

Danielle Leblance 2016 年 12 月 30 日
thanks that was very helpful
dpb
2016 年 12 月 31 日
>> ['first',
'second',
'last']
Error using vertcat
Dimensions of matrices being concatenated are not consistent.
>>
Image Analyst
2016 年 12 月 31 日
Yes, the triple dots are needed Danielle. With them it's like ['first', 'second', 'last'] which equals 'firstsecondlast', a single 1-d character array. Without them it tries to make a 2D array and for that to succeed, all strings need to be the same length because you can't have a 2-D array with a ragged right edge. However this demo works:
s1 = ['first', ...
'second', ...
'last']
s2 = ['first-',
'second',
'last--']
You get
s1 =
firstsecondlast
s2 =
first-
second
last--
Note you get a 1-D character array for the first and a 2-D array for the second. I padded the strings so that all strings had 6 characters so now it can make a 3 by 6 character array.

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