Can someone help me to implement this algorithm I have tried to but get errors

Algorithm

 Last code = 255
 Series = First input character
 While not end of while
   character = next input character
   if (series + character in code table)
       series = series + character
   else
       output = code for series
       add series and character to code table
       series = character
   end
   end
   output = code for series

Here is my code:

a=[39 39 126 126;39 39 126 126;39 39 126 126;39 39 126 126];
[f,g]=size(a);
total = f*g;
count=1;
imgchar= a(:)';

lastcode = 255;
tel = 1;
reeks = imgchar(1,1);
reekstr = num2str(reeks);
for j = 2:total
   kodetabel{j}= strcat(' ');
   reekskar{j}= strcat(',');
end
for i=2:total
   karakter(1,i)=imgchar(1,i);
   karstr = num2str(karakter(1,i));
   reekskar{i} = strcat([reekstr,' ',karstr]);
   waar = 0;
   for k=2:total
       if reekskar{i}==kodetabel{k}
           reeks= reekskar{i};
           waar=1;
       end
   end
   if waar==0
       output{tel}=reekstr;
       kodetabel{i}=reekskar{i};
       lastcode = lastcode+1;
       kodetabelnr{i}=lastcode;
       reeks=karakter(1,i);
       tel = tel+1;
   end;
end;
output{tel}=reeks;

[Laurent]

What is the error you get and in which line does it happen?

[Martin Park]

Error using == Matrix dimensions must agree.

Error in lzw (line 29) if reekskar{i}==kodetabel{k}

Answer 1

[Laurent]

It depends a bit on what result you want, but if you change that line to

if strcmp(reekskar{i},kodetabel{k})

the script runs. I don't know if this what you want, but at least there is a result. If you want something else, please tell us the result that you expect.

[Martin Park]

There is error in my code can you maybe help: When doing the algorithm by hand this is what I must get:

 a   series     character    code tabel         output
39    39
39    39         39           256=29,39          39
126   39         126          257=39,126         39
126   126        126          258=126,126        126
39    126        39           259=126,39         126
39    39         39
126   39,39      126          260=39,39,126      256
126   126        126
39    126,126    39           261=126,126,39     258
39    39         39
126   39,39      126
126   39,39,126  126          262=39,39,126,126  260
39    126        39
39    126,39     39           263=126,39,39      259
126   39         126
126   39,126     126          264=39,126,126     257 
      126                                        126

Help with this would be much appreciated

[Martin Park]

series in my code is named reeks and character is named karakter and code table is kode tabel

[Martin Park]

when following the algorithm above i get the output

Answer 2

[Martin Park]

Can anyone help me please