How do I take my generated string outputs from for loop and return a list?

Question

Brandon Tsang 2023-1-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1896650-how-do-i-take-my-generated-string-outputs-from-for-loop-and-return-a-list

编辑： Stephen23 2023-1-19

seq =  'ACAUUUGCUUCUGACACAACUGUGUUCACUAGCAACCUCAAACAGACA'
for i=1:3:numel(seq)-2
    a = (seq(i:i+2))
end
a = 'ACA'
a = 'UUU'
a = 'GCU'
a = 'GAC' 
etc...
    % Desired output --> ['ACA', 'UUU', 'GCU', 'GAC' ...]

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Answer 1

Walter Roberson 2023-1-19

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https://ww2.mathworks.cn/matlabcentral/answers/1896650-how-do-i-take-my-generated-string-outputs-from-for-loop-and-return-a-list#answer_1151585

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You should be careful what you ask for. 'ACA' is the 1 x 3 char vector ['A' 'C' 'A'] and ['ACA' 'UUU'] is concatenating two 1 x 3 vectors together getting a 1 x 6 vector 'ACAUUU' -- back to where you started

seq =  'ACAUUUGCUUCUGACACAACUGUGUUCACUAGCAACCUCAAACAGACA'
seq = 'ACAUUUGCUUCUGACACAACUGUGUUCACUAGCAACCUCAAACAGACA'
a1 = [];
a2 = cell(0);
for i=1:3:numel(seq)-2
    a1 = [a1, seq(i:i+2)];
    a2{end+1} = seq(i:i+2);
end
a1
a1 = 'ACAUUUGCUUCUGACACAACUGUGUUCACUAGCAACCUCAAACAGACA'
a2
a2 = 1×16 cell array
    {'ACA'}    {'UUU'}    {'GCU'}    {'UCU'}    {'GAC'}    {'ACA'}    {'ACU'}    {'GUG'}    {'UUC'}    {'ACU'}    {'AGC'}    {'AAC'}    {'CUC'}    {'AAA'}    {'CAG'}    {'ACA'}
a3 = reshape(seq, 3, []).'
a3 = 16×3 char array
    'ACA'
    'UUU'
    'GCU'
    'UCU'
    'GAC'
    'ACA'
    'ACU'
    'GUG'
    'UUC'
    'ACU'
    'AGC'
    'AAC'
    'CUC'
    'AAA'
    'CAG'
    'ACA'

I would suggest to you that the a3 method is easiest. You might want to cellstr() or string() the resutling 16x3 array.

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Answer 2

Sulaymon Eshkabilov 2023-1-19

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https://ww2.mathworks.cn/matlabcentral/answers/1896650-how-do-i-take-my-generated-string-outputs-from-for-loop-and-return-a-list#answer_1151580

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Here si the solution:

a=[];
seq =  'ACAUUUGCUUCUGACACAACUGUGUUCACUAGCAACCUCAAACAGACA'
seq = 'ACAUUUGCUUCUGACACAACUGUGUUCACUAGCAACCUCAAACAGACA'
for i=1:3:numel(seq)-2
    a = [a; (seq(i:i+2))];
end
a
a = 16×3 char array
    'ACA'
    'UUU'
    'GCU'
    'UCU'
    'GAC'
    'ACA'
    'ACU'
    'GUG'
    'UUC'
    'ACU'
    'AGC'
    'AAC'
    'CUC'
    'AAA'
    'CAG'
    'ACA'

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Stephen23 2023-1-19

编辑：Stephen23 2023-1-19

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It is inefficient to keep expanding an array in a loop like that.

Simpler and much more efficient:

seq = 'ACAUUUGCUUCUGACACAACUGUGUUCACUAGCAACCUCAAACAGACA';
mat = reshape(seq,3,[]).'
mat = 16×3 char array
    'ACA'
    'UUU'
    'GCU'
    'UCU'
    'GAC'
    'ACA'
    'ACU'
    'GUG'
    'UUC'
    'ACU'
    'AGC'
    'AAC'
    'CUC'
    'AAA'
    'CAG'
    'ACA'