reading from txtfile

Question

Sukuchha 2012-4-30

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/36978-reading-from-txtfile

i have a txt file,from which i want to read following lines into matlab. How can I read it ?

class lookup = {
   0,   0,   0,   0, 255,   0,   0,   0, 255, 255, 127,  80,  46, 139,  87,
   0, 255, 255}
class names = {
 Unclassified, forest [Green] 500 points, Water [Blue] 500 points, 
 baresoil [Coral] 500 points, Vegetation [Sea Green] 500 points, 
 Random Sample (Random Sample (builtup)) [Cyan] 500 points}

I want class lookup in nx3 matrix and out of class names i need only class names ( forest, water, baresoil, vegetation, builtup)

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Sukuchha 2012-4-30

Lookup is a color triplets (RGB) information representing color of 6 class in this case.

I tagged fgetl becuase i thought the best way is to read the file line by line .

Sukuchha 2012-4-30

Lookup is a color triplets (RGB) information representing color of 6 class in this case.

I tagged fgetl becuase i thought the best way is to read the file line by line .

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Answer 1

per isakson 2012-4-30

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/36978-reading-from-txtfile#answer_46235

在 MATLAB Online 中打开

Try this

lookup = { 0, 0, 0, 0, 255, 0, 0, 0, 255, 255, 127,  80,  46, 139,  87, 0, 255, 255};
names = { 'Unclassified'                                                ...
        , 'forest [Green] 500 points'                                   ...
        , 'Water [Blue] 500 points'                                     ...    
        , 'baresoil [Coral] 500 points'                                 ...
        , 'Vegetation [Sea Green] 500 points'                           ...
        , 'Random Sample (Random Sample (builtup)) [Cyan] 500 points}'   };
lup =   permute( reshape( [ lookup{:} ], 3, [] ), [ 2, 1 ] );
cac = regexp( names, '\<([\w ]+)(?:\[|\(.+){0,1}\>', 'tokens', 'once' ); 
cac = strtrim( cac );
str = cellfun( @(c) char(c), cac, 'uni', false );

I failed 'builtup':( Didn't read carefully enough.

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Sukuchha 2012-4-30

Thanks it worked like a charm. need to learn more about regexp :)

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Answer 2

Andrei Bobrov 2012-4-30

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/36978-reading-from-txtfile#answer_46244

在 MATLAB Online 中打开

N = regexp(names,'\w*(?=(.{1,3}\[))','match')';
tst = ~cellfun('isempty',N);
clr = reshape(lookup,3,[])';
out = [cellfun(@(x)x{:},N(tst),'un',0) clr(tst,:)];