# how to have character replacement

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Sharen H on 27 Feb 2013
every digit is converted to binary and are grouped with two bits each and i have to replace it with characters.
example A=11000100
i have to replace as
if
11 then 'A'
00 'C'
01 'G'
10 'T'
final result should be a=ACGT
I have written a code it takes long time to get executed
bi = dec2bin(secret,8) - '0';
out = reshape(mat2cell(bi,ones(size(bi,1),1),2*ones(size(bi,2)/2,1))',1,[]);
[r,c]=size(out);
for a = 1:c
if( out{a} == [0 0])
out{a} = 'C';
else
if( out{a} == [0 1])
out{a} = 'T';
else
if( out{a} == [1 0])
out{a} = 'A';
else
if( out{a} == [1 1])
out{a} = 'G';
end
end
end
end
end
Jan on 27 Feb 2013
Edited: Jan on 27 Feb 2013
Is A the double 11000100? If so, why do you run DEC2BIN? Or is the "A" in the text equal to "bi" in the code?

Azzi Abdelmalek on 27 Feb 2013
A='11000100'
s='ACGT'
f=['11';'00';'01';'10']
b=reshape(A,2,[])'
for k=1:numel(s)
idx=find(ismember(b,f(k,:),'rows'))
c(idx)=s(k)
end
out=c(:)'
Sharen H on 27 Feb 2013
Edited: Sharen H on 27 Feb 2013
Sir if it is just reverse how should i do ie the input i have is
s=GCTA
i should replace it as
s = 11000110

Honglei Chen on 27 Feb 2013
Edited: Honglei Chen on 27 Feb 2013
Sounds like a sequencing problem. You can do it like this
x = '11000100';
idx = bin2dec(reshape(x,2,[]).')+1;
matchset = 'CGTA';
matchset(idx)
##### 2 CommentsShowHide 1 older comment
Honglei Chen on 27 Feb 2013
corrected, thanks.

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