manipulating text files

2011 9 19
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I have a .txt file structured as below:
title
name 00xxxx yyyy
name 00xxxx yyyy
in each line the first n characters describe a name, followed by 67-n spaces, then a 6 digit code starting with 2 zeros and after 9 spaces a 4 digit codes. What i need to do is copy the xxxx numbers to the place of the yyyy numbers in all lines of the file and save it back to .txt file by maintaining the exact structure in the output file. How could i handle something like that in matlab ?
Thanks in advance

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TAB
TAB 2011-9-19

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fi=fopen('YourFile.txt','r');
fo=fopen('outfile.txt','w');
txtcell=textscan(fi,'%s','delimiter','\n');
Str1Idx=1;
Str2Idx=68;
Str3Idx=82;
StrLen=86;
for i=1:length(txtcell{1})
if(length(txtcell{1}{i})==StrLen)
txtcell{1}{i}((Str3Idx):(Str3Idx+4))=txtcell{1}{i}((Str2Idx+2):(Str2Idx+6));
end
fprintf(fo,strcat(txtcell{1}{i},'\n'));
end
fclose(fi);
fclose(fo);

4 个评论
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Jan
Jan 2011-9-19
You can get txtcell{1} as separate variable. This is much faster and nicer then accessing the data as nested cell.
conrad Landis
conrad Landis 2011-9-19
it works, but i still have a problem concerning the space delimiters after column no 86. My original document has 159 columns in each line and so i want the output file to be exact the same. By removing strcat from your code i am able to print the 159 columns with whitespaces but i can't manage change line to the output.
TAB
TAB 2011-9-19
Try
fprintf(fo,txtcell{1}{i});
fprintf(fo,'\n');
conrad Landis
conrad Landis 2011-9-19
Thanks it works great although it skips a line. Using fgetl does not skip anything:
inputFile = 'input.txt';
outputFile = 'output.txt';
fi=fopen(inputFile,'r');
fo=fopen(outputFile,'w');
jline=0;
while 1
jline = jline+1;
pretxtcell{jline,:} = fgetl(fi);
if ~ischar(pretxtcell{jline}), break, end
if pretxtcell{jline}==-1, break, end
txtcell{jline,:}=pretxtcell{jline};
if jline>=1
txtcell{jline,1}(1,81:86)=pretxtcell{jline,1}(1,67:72);
end
end
fclose(fi);
for i = 1:size(txtcell,1)
fprintf(fo,txtcell{i,1});
fprintf(fo,'\r\n');
end
fclose(fo);
Anyway, thanks a lot

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