split string into 3 letter each

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Elysi Cochin
Elysi Cochin 2013-12-11
评论： Mohammed Alrajeb 2019-8-19
if have a
str = 'AGTCTGTCTTTG';
i wanted to split it into 3 letters each
AGT CTG TCT TTG
and replace
AGT with J
CTG with U
TCT with N
TTG with D
how to do it... please do reply....
i did as below
str = 'AGTCTGTCTTTG';
j = 1;
for k = 1: 3: length(str)
word(j) = str(k : k +3)
j = j+1;
end
but i get error as
??? Subscripted assignment dimension mismatch.
Error in ==> Untitled2 at 4
word(j) = str(k : k +3)
please do reply....

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采纳的回答

Azzi Abdelmalek
Azzi Abdelmalek 2013-12-11
编辑：Azzi Abdelmalek 2013-12-11
str ='AGTCTGTCTTTG';
a=cellstr(reshape(str,3,[])')
What is the aim of the replacement ? you can create
v={'J','U','N','D'}
  2 个评论
Azzi Abdelmalek
Azzi Abdelmalek 2013-12-11
If you have another string
s='AGT kdjd CTGer TCTTTG1'
str ='AGTCTGTCTTTG';
a=cellstr(reshape(str,3,[])')
v={'J','U','N','D'}
for k=1:numel(v)
s=strrep(s,a{k},v{k})
end
Mohammed Alrajeb
Mohammed Alrajeb 2019-8-19
hi every one.
my question is I have string of binary (00000100) 64 bits I want to take them over the number of each number is 8 bits and convert it to int8 amd use this number as input to my equation . how can i do that by function.
thanks

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更多回答（2 个）

Jos (10584)
Jos (10584) 2013-12-11
编辑：Jos (10584) 2013-12-11
In your loop code, you want to store store a string of three elements into a spot with only 1 element "word(j)". This will not fit. A solution is to use a cell array of strings, using curly brackets:
str = 'AGTCTGTCTTTG';
j = 1;
for k = 1: 3: length(str)
word{j} = str(k : k +3)
j = j+1;
end
which can be replaced by:
word = strread(str,'%3s')
or
word = mat2cell(str,1,repmat(3,1,numel(str)/3))
To replace multiple values at once you could take a look at REPLACE function, which I made available through the File Exchange:
result = replace(word,{'AGT','CTG','TCT','TTG'},{'J','U','N','D'})
REPLACE is a user-friendly wrapper function using ismember http://www.mathworks.com/matlabcentral/fileexchange/10063-replace
Mohammed Alrajeb
Mohammed Alrajeb 2019-8-19
hi every one.
my question is I have string of binary (00000100) 64 bits I want to take them over the number of each number is 8 bits and convert it to int8 amd use this number as input to my equation . how can i do that by function.
thanks

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