split string into 3 letter each

Question

Elysi Cochin 2013-12-11

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/109411-split-string-into-3-letter-each

评论： Mohammed Alrajeb 2019-8-19

采纳的回答： Azzi Abdelmalek

在 MATLAB Online 中打开

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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Answer 1

Azzi Abdelmalek 2013-12-11

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编辑：Azzi Abdelmalek 2013-12-11

在 MATLAB Online 中打开

str ='AGTCTGTCTTTG';
a=cellstr(reshape(str,3,[])')

What is the aim of the replacement ? you can create

v={'J','U','N','D'}

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Azzi Abdelmalek 2013-12-11

在 MATLAB Online 中打开

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 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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Answer 2

Jos (10584) 2013-12-11

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编辑：Jos (10584) 2013-12-11

在 MATLAB Online 中打开

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

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Elysi Cochin 2013-12-11

thank u all....

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Answer 3

Mohammed Alrajeb 2019-8-19

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/109411-split-string-into-3-letter-each#answer_388158

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