matlab如何导入csv文件及matlab支持的数据格式，相应函数

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使用csvread函数读取
M = csvread('filename')
M = csvread('filename', row, col)
M = csvread('filename', row, col, range)

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输出用：

csvwrite('filename',M)
csvwrite('filename',M,row,col)

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实际使用时importdata()函数比较方便，从Excel另存数据为"csv"文件，matlab在读取时容易产生如下错误：

??? Error using ==> dlmread at 145
Mismatch between file and format string.
Trouble reading number from file (row 1, field 2) ==> " -0.

Error in ==> csvread at 52
    m=dlmread(filename, ',', r, c);

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 Data formats                     Command    Returns
    MAT  - MATLAB workspace         load       Variables in file.
    CSV  - Comma separated numbers  csvread    Double array.
    DAT  - Formatted text           importdata Double array.
    DLM  - Delimited text           dlmread    Double array.
    TAB  - Tab separated text       dlmre