convert string to bits and then convert bits back to strings ....

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user06
user06 on 1 May 2015
Commented: Joseph Cheng on 7 May 2015
facing problem with this code..
word='hello';
wordBinary = reshape(dec2bin(word,7)',1,[]);
% note the <'> after the dec2bin, to transpose the matrix
for j=1:size(wordBinary,2)
wordOutput(1,j) = str2double(wordBinary(1,j));
end
disp(wordOutput);
for j=1:size(wordOutput,2)
s(1,j) = num2str(wordOutput(1,j));
end
t = reshape(s, length(s)/7, 7);
decimalValues = bin2dec(t);
y=char(decimalValues);
disp(y);
output is coming wrong.. please help. o/p is:J U - { please help me in this..
  1 Comment
Jurgen
Jurgen on 1 May 2015
I think dec2bin can not take a string...
Wordoutput is not declared before it is used.
I think reshape is not needed, because a string is 1xn sized by default.

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Answers (2)

Joseph Cheng
Joseph Cheng on 1 May 2015
Edited: Joseph Cheng on 1 May 2015
the issue is with your
t =reshape(s,length(s)/7,7);
it should read
t = reshape(s,length(s)/length(word),length(word));
decimalValues = bin2dec(t');
if you look at your original reshape you can see that it is basically transposed. This is because reshape does not fill in rows first then columns. Reshape takes the array and starts filling in the reshaped matrix starting from column 1 then moves to column 2 and so on.
this short example shows what is happening
x = [1 2 3 4 5 6 7 8 9 10 11 12]
reshape(x,3,4)
  2 Comments
Joseph Cheng
Joseph Cheng on 7 May 2015
really i would say you don't understand what is happening and you should step through it step by step looking at each line in debug mode. since
word='hello';
wordBinary = reshape(dec2bin(word,7)',1,[]);
% note the <'> after the dec2bin, to transpose the matrix
for j=1:size(wordBinary,2)
wordOutput(1,j) = str2double(wordBinary(1,j));
end
disp(wordOutput);
for j=1:size(wordOutput,2)
s(1,j) = num2str(wordOutput(1,j));
end
t = reshape(s,length(s)/length(word),length(word));
decimalValues = bin2dec(t');
y=char(decimalValues);
disp(y');
works just fine

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Guillaume
Guillaume on 1 May 2015
Edited: Guillaume on 1 May 2015
I'm not really sure what output you're looking for, but I would do it like this:
word = 'hello';
wordbinary = dec2bin(word', 7) - '0'
originalword = char(bin2dec(char(wordbinary + '0')))'

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