extractBefore function not giving correct answer.

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amna chaudhary
amna chaudhary 2018-4-10
评论： amna chaudhary 2018-4-10
I have a protein sequence and I want to make fragments of it. for example the protein sequence is 'MSKAHFRQWTYVSKATYQRW' and the fragments should be 'M', 'MS', 'MSK', 'MSKA', 'MSKAH', 'MSKAHF', 'MSKAHFR', 'MSKAHFRQ' and so on. Im using the following code:
seq = 'MSKAHFRQWTYVSKATYQRW';
frag = [];
for i = 1:length(seq)
ii = extractBefore (seq, seq(i));
frag = [frag char (length(seq)) ii];
end
frag
But after some loops it does not follow the rule and starts giving wrong answers. The output is :
'M MS MSK MSKA MSKAH MSKAHF MSKAHFR MSKAHFRQ MSKAHFRQW MSKAHFRQWT MSKAHFRQWTY M MS MSK MSKAHFRQW MSKAHFRQWT MSKAHFR MSKAHF MSKAHFRQ'
please help. TIA.

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采纳的回答

Birdman
Birdman 2018-4-10
编辑：Birdman 2018-4-10
The following code simply does what you want:
seq = 'MSKAHFRQWTYVSKATYQRW';
for i=1:numel(seq)
Seq{i}=seq(1:i);
end
The outputs are stored in a cell array, you can see any fragment by typing
Seq{1}
Seq{2}
and so on.

更多回答（1 个）

Steven Lord
Steven Lord 2018-4-10
So at iteration n you want the first n characters from the text? If you're using a char vector, just use indexing.
word = 'hello';
for k = 1:length(word)
fprintf('%s\n', word(1:k));
end
If you're using a string, use extractBetween.
word = "hello";
for k = 1:strlength(word)
fprintf('%s\n', extractBetween(word, 1, k));
end

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