MATLAB: How to read specific part of the text file

readread specific part in file

So, I have text file in Notepad data.txt which contain all information about some image for example
  • image1.gif
  • gif
  • 256
  • 256
  • 155.992455 321.222455 995.452774 741.123478
  • 15 24 35
  • 41 52 64
  • 58 59 50
so I have name of image, extension,height, width, matrix of gray image and matrix of image in this order in file. I made function which receives namefile and parameter which is needed to be read. So I want that the result of function be that parametar from text file for example function:
readformfile('data.txt','MatrixOfImage')
and result should be this
15 24 35
41 52 65
58 59 50
I have written the function but it reads all text from file and I don't know how to read only specific parameter from file
function result=readfromfile(namefile,parameter)
result=fileread(namefile);
end
I would be very grateful if someone could help me.

Best Answer

With Matlab there are many ways. The one below is one of them. Regard the first five lines as a "header" and use textscan.
    >> num = cssm()
    num =
        15    24    35
        41    52    64
        58    59    50
where
    function    num = cssm() 
        fid = fopen( 'cssm.txt' );
        cac = textscan(fid,'%f%f%f', 'Headerlines',5, 'CollectOutput',true );
        fclose( fid );
        num = cac{1};
    end
and cssm.txt contains
    image1.gif
    gif
    256
    256
    155.992455 321.222455 995.452774 741.123478
    15 24 35
    41 52 64
    58 59 50
&nbsp
In response to comment
Try this modified function
    >> out = cssm( 'cssm1.txt', 'name_of_image' )
    out =
    image1.gif
    >> out = cssm( 'cssm2.txt', 'color_image' )
    out =
        78    44    28
        77    32    71
        55    12    53
    >> out = cssm( 'cssm2.txt', 'RBG_image' )
    name_of_image, extension, height, width, gray_image, color_image
    out =
         []
    >> out = cssm( 'cssm1.txt', 'width' )
    out =
       256
where
    function    out = cssm( filespec, param ) 
        fid = fopen( filespec );
        cac = textscan( fid, '%s', 'Delimiter','\n', 'CollectOutput',true );
        fclose( fid );
        switch lower( param )
            case 'name_of_image'
                out = cac{1,1};
            case 'extension'
                out = cac{2,1};
            case 'height'
                out = str2double( cac{3,1} );
            case 'width'
                out = str2double( cac{4,1} );
            case 'gray_image'
                out = str2num( cac{5,1} );
            case 'color_image'
                out = str2num( char(cac(6:8,1)) );
            otherwise
                str = 'name_of_image, extension, height, width, gray_image, color_image';
                disp( str )
                out = [];
        end
    end
and cssm2.txt contains
    image2.gif
    gif
    128
    128
    456.972255 333.2147455 895.441274 125.111278
    78 44 28
    77 32 71
    55 12 53
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