Convert variable-width text file numbers to UINT8 table?

Question

Bjoern 2014-6-27

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/137967-convert-variable-width-text-file-numbers-to-uint8-table

回答： C.J. Harris 2014-6-27

ExampleFile.txt

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Hi :)

I have a file holding UINT8 integers:

Each line contains 1 to 8 integers
Each line is of width = 3 + (N-1)*4; where N is number of integers
Each value reserves exactly 3 characters (with leading space)
Each value is space-separated
Each line is '' terminated

Below is an example format:

//File begins
216 165 154 233 210 209 129
17 228
27  13  94   6  29   0   0
114   2   0  61 100  71
 3   2  15  15   8  13   7
//File ends

I need to read out this data to a UINT8 table per below but cannot figure out a good way. I'd like to use a similar approach to this other solution where loops are avoided for good performance:

Goal = uint8([130 216 165 154 233 210 209 129 ; ...
               63  17 228   0   0   0   0   0 ; ...
                2  27  13  94   6  29   0   0 ; ...
                7 114   2   0  61 100  71   0 ; ...
               81   3   2  15  15   8  13   7 ]);

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Answer 1

C.J. Harris 2014-6-27

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/137967-convert-variable-width-text-file-numbers-to-uint8-table#answer_142754

在 MATLAB Online 中打开

It's not very elegant, and it's not very efficient - so enjoy:

nRaw  = {'130 216 165 154 233 210 209 129'
         ' 63  17 228'
         '  2  27  13  94   6  29   0   0'
         '  7 114   2   0  61 100  71'
         ' 81   3   2  15  15   8  13   7'};
Goal = zeros(size(nRaw,1),8,'uint8');
for nRow = 1:size(nRaw)     
    Goal(nRow,:) = str2num(['uint8([',[nRaw{nRow}, char(repmat([32 32 32 48], ... 
    1, floor((31-length(nRaw{nRow}))/4)))],'])']);
end