MATLAB: Hi every one, how can i extract the first column(first field) that it’s name is Range form a structure 1×84 with 3 fields, thank you

MATLAB

i attached the structure field in a file .mat and i take a screen shot , if it can help, thank you again

Best Answer

Like I gave in my answer to your duplicate question:

s = load('Tailwind_satE08.mat')
DETECTION = s.DETECTION
% Extract into 3 separate variables.
Range = [DETECTION.Range];
Doppler = [DETECTION.Doppler];
TxPOS = [DETECTION.TxPOS];

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A slight modification of the textscan command I provided to your question the other day will read the file. (You never explained how "::" should be interpreted.) What do you mean by "I read each filed alone of a one row, textscan do not work with it."? If you don't need a column add "*" after "%", e.g. "%*d" to suppress the first column.

Thus

    >> cac = txt2m
    cac = 
        [3x1 int32]    {3x1 cell}    {3x1 cell}
    >> cac{:}
    ans =
               1
               2
               8
    ans = 
        'Toy Story (1995) '
        'Jumanji (1995) '
        'Tom and Huck (1995) '
    ans = 
        'Animation|Children's|Comedy'
        'Adventure|Children's|Fantasy'
        'Adventure|Children's'
    >>

where the function, txt2m, is given by

    function    cac = txt2m()
    fid = fopen('cssm.txt');
    cac = textscan( fid, '%d%s%s'                       ...
                ,   'Delimiter'             ,   ':'     ...
                ,   'CollectOutput'         ,   false   ...
    ...         ,   'EmptyValue'            ,   -999    ...
    ...         ,   'ExpChars'              ,   ''      ...
                ,   'MultipleDelimsAsOne'   ,   true    ... 
                ,   'Whitespace'            ,   ''      );
    fclose( fid );    
    end

then regexp and str2num

    >> regexp( cac{2}, '\d{4}', 'match' )
    ans = 
        {1x1 cell}
        {1x1 cell}
        {1x1 cell}
    >> ans{:}
    ans = 
        '1995'
    ans = 
        '1995'
    ans = 
        '1995'

--- In response to the answer below ---

This modified function, txt2m, reads and parses your file. It reads the file to a string with the function, fileread (thanks Walter, I didn't know of that one), and replaces "::" by "¤" (knock on wood). I just picked a character on the keyboard.

Try

>> cac = txt2m()
cac = 
    [13x1 int32]    {13x1 cell}    {13x1 cell}
>>

where

cssm.txt contains your 13 rows

and where

function    cac = txt2m()
str = fileread( 'cssm.txt' );
str = strrep( str, '::', '¤' );
cac = textscan( str, '%d%s%s'                       ...
            ,   'Delimiter'             ,   '¤'     ...
            ,   'CollectOutput'         ,   false   ...
...         ,   'EmptyValue'            ,   -999    ...
...         ,   'ExpChars'              ,   ''      ...
            ,   'MultipleDelimsAsOne'   ,   true    ... 
            ,   'Whitespace'            ,   ''      );
end

Best Answer

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