concatenate and replace comma by dot

2012 12 17
2 个回答
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0 个投票

Hello, I have a series of 300 files with names respectively from data-1.dat to data300.dat. Each file consist of 6 columns and 25 rows (files contain scalars with comma instead of dot, ex: 3,21223232 and a header line) I want to concatenate all files into one matrix and I'm using the code below:
% code
numfiles = 300;
concat= cell(1, numfiles);
for i=1:300;
i
filename = sprintf(data-%d.dat, i);
concat{i} = importdata(filename, '\t');
end
the_struct = [concat{:}];
M = [the_struct.data];
For data that doesn't have a comma the code work very well, otherwise it doesn't. Anyhelpful answer is very welcome. Thank you in advance.

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 采纳的回答

Jan
Jan 2012-12-17
编辑：Jan 2012-12-18

1 个投票

numfiles = 300;
concat = cell(1, numfiles);
for ii = 1:numfiles
filename = sprintf('data-%d.dat', ii);
concat{ii} = strrep(fileread(filename), ',', '.');
end
newFile = fullfile(tempdir, 'JoinedFile.dat');
FID = fopen(newFile, 'w');
if FID == -1, error('Cannot open file for writing'); end
fprintf(FID, '%s', concat{:});
fclose(FID);
Now the new file contains all data with dots instead of commas and can be imported at once.
[EDITED] Remove headerlines, which start with 'F':
concatC = cell(1, numfiles);
for ii = 1:numfiles
filename = sprintf('data-%d.dat', ii);
Str = strrep(fileread(filename), ',', '.');
CStr = regexp(Str, '\n', 'split');
CStr(strncmp(CStr, 'F', 1)) = [];
% Perhaps:
if isempty(CStr{end})
CStr(end) = [];
end
concatC{ii} = CStr(:);
end
concat = cat(1, concatC{:});

8 个评论
显示 6更早的评论 隐藏 6更早的评论

Momo
Momo 2012-12-18
Thank you very much it help a lot. However, I'm still stack with the new file how to remove the header line (ex: each 25 row I have a text data "headerline"). Thank you in advance.
Jan
Jan 2012-12-18
How can these headerlines be recognized? An explicit example would be helpful.
Momo
Momo 2012-12-18
编辑：Momo 2012-12-18
Headerline looks like: Frequency R X sigma sigmasec M Msec
Jan
Jan 2012-12-18
编辑：Jan 2012-12-18
Sorry, Momo, does this mean that all header lines can be detected by a leading 'F' character? If so, they can be removed easily before writing the joined data file.
Momo
Momo 2012-12-18
编辑：Momo 2012-12-18
Yes Jan they are detected by an 'F' character.
Momo
Momo 2012-12-19
Is there an answer to my question??? Thank you in advance.
Jan
Jan 2012-12-20
@Momo: Have you seen the [EDITED] section in my answer? If not, do you have any reason to be inpatient?
Momo
Momo 2012-12-20
@Jan: No I just have seen it. Sorry for been inpatient (It's because I had a deadline). Thank you very much for your precious help.
M.

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更多回答（1 个）

Momo
Momo 2012-12-18

0 个投票

When I try to import data
all_data= importdata('JoinedFile.dat');
It import data as a text, colheader and data with only the first set of 25 rows and 6 columns(i.e only first file), and leave 299.
Best regards,

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