4

我有一个像这个专栏一样的文本文件:

0,472412
0,455627
0,439148
0,421753
...
0,116577
0,086670
0,057373
0,027161

matlab中如何将逗号转换为点?

4

4 回答 4

4

Matlabs 网站上的这篇文章建议:

function comma2point_overwrite( filespec )
% replaces all occurences of comma (",") with point (".") in a text-file.
% Note that the file is overwritten, which is the price for high speed.
    file = memmapfile( filespec, 'writable', true );
    comma = uint8(',');
    point = uint8('.');
    file.Data( transpose( file.Data==comma) ) = point;
    delete(file)
end 
于 2012-10-30T15:53:04.323 回答
2

...或者你可以这样做:

wholefile = fileread('yourfile.txt')       % read in entire file
newfiledata = strrep(wholefile,',','.')    % replace commas with full stops
fileid = fopen('yourfile.txt','w')         % open file to write
fprintf(fileid,'%s',newfiledata)           % print to file
fclose(fid2)
于 2012-10-30T17:11:13.303 回答
1

另一种选择,(因为您想将文件打开到 matlab 的工作区)是:

  • 使用加载文件

     a=load('filename.txt');
    

因为逗号是默认分隔符,所以您会得到一个 2xN 矩阵,例如:

a =

       0      472412
       0      455627
       0      439148
       0      421753
  • 找到有效的位数以获得正确的小数点位置:

     d = 10.^(1+floor(log10(abs(a(:,2)))));
    
  • 然后:

     v=a(:,2)./d
    

将产生您想要的向量。现在您可以将其保存回文件,或执行任何操作...

于 2012-10-30T16:13:10.983 回答
1

a='0,00445'

a = 0,00445

b=strrep(a,',','.')

b = 0.00445

于 2014-07-24T08:16:05.237 回答