adding headers when using fprintf to write to text
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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 个评论
dpb
2016-12-30
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...
采纳的回答
Image Analyst
2016-12-30
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 个评论
Danielle Leblance
2016-12-30
Walter Roberson
2016-12-30
You cannot continue a string constant with ...
Use
['first',
'second',
'last']
dpb
2016-12-30
Because you can't continue character constant across line continuation markers...
hdr=['dt ID Year Month Day Obs ROA SigmaROA EqCgta AvgEqCgta ROE0 ' ...
'ROEM1Q ROEM2Q ROEM3Q ROEM4Q ' ...
.
.
.
'CreditDev TradingDev size '];
fprintf(fid,'%s\n',hdr);
NB: Must include the blank between the last substring on the continued line before the first of the following or they'll all run together.
cellstr could be your friend here to make it simpler to code...
Danielle Leblance
2016-12-30
dpb
2016-12-31
>> ['first',
'second',
'last']
Error using vertcat
Dimensions of matrices being concatenated are not consistent.
>>
Image Analyst
2016-12-31
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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