Creating a text file to specific format

2014 5 23
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更新时间：2014 5 26
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Hi,
I have a matrix called data (3652500 x 3). But data matrix dont have the header (i.e. names).
I want to insert column headers as shown below and write the output to a text file inserting 4th column from another matrix called output (3652500 x 1). I need to insert the output matrix in the 4th column of data matrix with 3 spaces between 3rd columns and 4th column. (See the header and sample rows below)
DATE TMAX TMIN RAIN
3000001 -99.9 -99.9 0.6
3000002 -99.9 -99.9 0.5
How can I do it MATLAB.
Any help is appreciated.
Thanks.

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Image Analyst
Image Analyst 2014-5-23
编辑：Image Analyst 2014-5-24

0 个投票

With fprintf() you can make it look anyway you want. Have you tried that function?
output = 99*rand(10,4);
output(:,1) = round(output(:,1))
filename = 'deleteme.txt';
fid = fopen(filename, 'wt');
if fid ~= -1
fprintf(fid, 'DATE TMAX TMIN RAIN\n');
for row = 1 : size(output, 1)
fprintf(fid, '%d %.1f %.1f %.1f\n', output(row, :));
end
fclose(fid);
end

5 个评论
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Damith
Damith 2014-5-23
I haven't tried that.
Where should my data matrix go in your code.? I need to create a text file. What values will it fill for 1, 2, and 3 columns.?
Thanks.
Image Analyst
Image Analyst 2014-5-24
I forgot to put the fid inside the fprintf(), and 'wt' inside fopen(). It's correct now.
Damith
Damith 2014-5-25
编辑：Damith 2014-5-25
Hi,
Thanks a lot for your code. It's working now but one more problem is as shown in the sample output is that I need to right justify the output so that decimal points are aligned properly.
Can you please suggest me a method in your code.
3792227 -99.9 -99.9 1.1
3792228 -99.9 -99.9 13.9
3792229 -99.9 -99.9 0.1
3792230 -99.9 -99.9 12.4
I need my output to appear as
3792227 -99.9 -99.9 1.1
3792228 -99.9 -99.9 13.9
3792229 -99.9 -99.9 0.1
3792230 -99.9 -99.9 12.4
Many thanks again.
Image Analyst
Image Analyst 2014-5-25
It's just like any format string that you're used to in most any other language that you've ever used. If you use %.1f, the field width varies according to the size of the number. If you put %6.1f, it will pad out to make it a fixed field width of 6 characters.
Damith
Damith 2014-5-26
Thanks. I figured it out.

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