how to convert a long list into an array with semicolongs

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David
David 2013-9-13
I'm pretty new to MatLab but while this seems very simple I can't find an answer
I am downloading amino acid or nucelotide sequences from the NIH data base, and these appear like
CGTGAATACAAAAATATGCCAGCTTGCTAATATAATAACGATGTTTTCAAATCCATTAAGTTAACAACAA
that go on for hundreds or thousands of letters
I'm using each letter to trigger a different event, in this case play a different sound
to do so I need each letter separated by a semicolon, which I believe makes it a separate row in an array
is there an instruction that will take a string of letters as above and insert a semicolon between the letters?
thanks very much, Dave

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回答（2 个）

Simon
Simon 2013-9-13
编辑：Simon 2013-9-13
Hi!
What exactly do you need? Do you have a loop for playing sounds according to the letters?
for n = 1:length(str)
switch (str(n))
case 'C'
% play a C
case 'G'
% play a G
case 'T'
% play a T
case 'A'
% play a A
end
end
David
David 2013-9-13
Simon, thanks very much for your help
so, first I tried this
for n = 1:length(ORFMAPT)
switch (ORFMAPT(n))
case 'C'
sound(C)
case 'G'
sound(G)
case 'T'
sound(T)
case 'A'
sound(A)
end
end
where ORFMAPT is a long list of nucleotides 'atcgcgtat...' and the sounds are ones I entered and named C,G,T,A= if I just write sound(A) and return I get the sound, but if I use the above, nothing plays. If you have any advice, very appreciated.
Essentially if something like this works the original question is moot, as I won't need to place each amino acid or nucleotide in an array
thanks again, Dave
  1 个评论
Simon
Simon 2013-9-16
Hi!
Is your string composed of upper or lower case letters? Try using the "upper" function in
switch upper(ORFMAPT(n))

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