How to access a group of bits from a string ?

Question

Abirami 2015-1-27

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https://ww2.mathworks.cn/matlabcentral/answers/172534-how-to-access-a-group-of-bits-from-a-string

评论： Abirami 2015-1-28

Hello,

   I have a problem on how to access a specific range of bits from a given string
Consider I have a 20 bit string,I want to access the bit 1-6 and 7-12 and then 13-20. How do I do it in matlab? please help thanks in advance

Eg: X = 0 0 0 0 0 0 1 1 1 0 0 1 1 1 1 1 0 0 0 0

I want the output as

x1= 0 0 0 0 0 0
x2= 1 1 1 0 0 1
x3= 1 1 1 1 0 0 0 0

I have no idea how to do it.Please help. thanks in advance

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Answer 1

Image Analyst 2015-1-27

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https://ww2.mathworks.cn/matlabcentral/answers/172534-how-to-access-a-group-of-bits-from-a-string#answer_166110

在 MATLAB Online 中打开

It's a little ambiguous, but how about just indexing or subtracting '0':

X = '0 0 0 0 0 0 1 1 1 0 0 1 1 1 1 1 0 0 0 0'
% Get rid of any spaces
X(X==' ') = []
% Extract the three substrings
x1 = X(1:6)
x2 = X(7:12)
x3 = X(13:end)
% Convert to a numerical data type.
doubleX = X - '0'

In the command window:

X =
0 0 0 0 0 0 1 1 1 0 0 1 1 1 1 1 0 0 0 0
X =
00000011100111110000
x1 =
000000
x2 =
111001
x3 =
11110000
doubleX =
     0     0     0     0     0     0     1     1     1     0     0     1     1     1     1     1     0     0     0     0