0 个投票

I have a file VarName3.txt like this:
[2.281000003
2.593500003
2.749750003
3.062250003
3.062250003...
and negative values too. It is 1x1000.
The code I am using is:
fid=fopen('VarName3.txt','r');
atensao=fread(fid,'float');
fclose(fid);
When I type in Comand Window to check atensao, the answer is:
1.0e-03 *
0.0425
0.0000
0.0000
0.0006
0.0000...
Why it doesn't work? What am I doing wrong? Could someone teach me? Thanks a lot.

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dpb
dpb 2014-2-10

0 个投票

fid=fopen('VarName3.txt','r');
atensao=fread(fid,'float');
fclose(fid);
Surprising got anything that reasonable. If the input file is actually an ASCII text file, then use fscanf instead of fread. fread is for stream unformatted data, not formatted.
fid=fopen('VarName3.txt','r');
atensao=fscanf(fid,'%f');
fclose(fid);
Or use one of the higher-level routines--while deprecated by TMW, textread is awfully handy for such simple cases as it wraps the fopen/fclose in the call and returns an array rather than a cell for the much fancier textscan
atensao=textread('VarName3.txt');
even allowing to dispense with the format string for simple numeric data such as your case. See
doc textread
doc textscan
doc fscanf
for more details

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Thank you "dpb". I really appreciated. But when I check "atensao" it shows me number like: 2.2810 instead of 2.281000003 (from original file VarName3.txt). Do you know how can I fix it? Thank you again.

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更多回答（1 个）

Walter Roberson
Walter Roberson 2014-2-10

0 个投票

If you are reading text you should not be using fread() which is for reading binary files.
Have a look at fscanf(). Also have a look at textscan()

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