How to convert char string to bit string
24 visualizaciones (últimos 30 días)
Mostrar comentarios más antiguos
bikekowal Marcin Kowalski
el 11 de Oct. de 2016
Comentada: Walter Roberson
el 11 de Oct. de 2016
Hi,
I am trying to solve a problem which might look like quite easy to solve, hopefully. I have a structure with 5 cells. Each cell contains a string of characters. I would like to concatenate all the strings into one string. I have used strjoin function but the result is following: "1100100 1110011 1100100 1100001 1100100". There are gaps between these small strings. Next step I need to do is to convert the entire string into bit string. Any ideas what I do wrong?
best, Marcin
0 comentarios
Respuestas (3)
Massimo Zanetti
el 11 de Oct. de 2016
str='100100 1110011 1100100 1100001 1100100'
str=regexprep(str,' ','')
result = str-'0'
0 comentarios
Walter Roberson
el 11 de Oct. de 2016
Editada: Walter Roberson
el 11 de Oct. de 2016
onestring = strjoin(TheCellArrayOfStrings, '');
bitstring = reshape(dec2bin(onestring, 8).', 1, []);
You might want to subtract '0' from the result, if what you want is binary rather than a string of text.
2 comentarios
Jos (10584)
el 11 de Oct. de 2016
what is wrong with simple concatenation
onestring = cat(1,TheCellArrayOfStrings{:})
Walter Roberson
el 11 de Oct. de 2016
Editada: Walter Roberson
el 11 de Oct. de 2016
Each cell contains a string of characters
To that point we had not been given that the characters are restricted to '0' and '1'.
People asking here about converting strings of characters to bitstrings are typically working with steganography (or watermarking) and typically have arbitrary text to convert into bit format.
bikekowal Marcin Kowalski
el 11 de Oct. de 2016
Editada: per isakson
el 11 de Oct. de 2016
1 comentario
Walter Roberson
el 11 de Oct. de 2016
If you have a character vector S (not a cell array, just a single string), then you can convert the type of data but not its value by using uint16(S) . For example,
>> uint16('101')
ans =
1×3 uint16 row vector
49 48 49
You need to use uint16() for this purpose rather than uint8(), because characters in MATLAB are 16 bits, so converting to 8 bits would be a change in content.
You might have expected the integers 1 0 1 as the output, but the characters '0' and '1' are not represented by the integers 0 and 1: they are represented by the integers 48 and 49. See https://upload.wikimedia.org/wikipedia/commons/thumb/1/1b/ASCII-Table-wide.svg/2000px-ASCII-Table-wide.svg.png . Converting '0' and '1' to 0 and 1 requires a change in content.
Ver también
Categorías
Más información sobre Characters and Strings en Help Center y File Exchange.
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!