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RodAG
RodAG
Last Activity: Apr 9 '14, 04:00 PM
Joined: Mar 12 '12
Location: Cuernavaca, Morelos; Mexico.
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  • RodAG
    started a topic Copying a string from file
    in Linux

    Copying a string from file

    Hi there.
    I'm new to Linux, I'm using the 12.04 LTS distribution and I'm having kind of a hard time here.
    I have a file which contains information in the fasta format (a format for biologists), which looks like this:

    >Id string_of_varia ble_length ~Number~Id2
    [string of thousands of characters]

    >Id string_of_varia ble_length ~Number~Id2
    [string of thousands of characters]

    ...
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    • RodAG
      started a topic Reading from a file
      in Python

      Reading from a file

      I'm trying to get data from a txt file, still I don't know how to do it. The data is in fasta format (a format used in molecular biology to store protein/DNA sequences) whis is very simple:
      Code:
      >Header1
Sequence1

>Header2
Sequence2
.
.
.
>HeaderN
SequenceN
      The ">" is always present and denotes an identifier line (in which we usually...
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      • RodAG
        started a topic Size of a string
        in Python

        Size of a string

        I'm using a computer with 4 GB DDR3 Memory and Intel core i5 processor.
        My question is about the max size of a string/list.

        I want to make operations over a matrix of, let's say 30 rows and about 1500 columns (one character per column). Is it possible with the above specifications or should I split the matrix into pieces so each one has less columns?
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        • RodAG
          replied to What is your OS and Python Version
          in Python
          Windows 7 Home Premium
          Python 2.7.2 (Tk version 8.5)
          And using IDLE (2.7.2) to edit.

          Maybe I'll move soon to Linux (ubuntu? not sure yet).
          It's the first time I try to use a programming language and have had some minor troubles but I guess it's only a matter of time so I get used to Python.
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            Leave a comment:

          • RodAG
            replied to Filling a list of lists...
            in Python
            @bvdet

            Thanks for your reply. I tried the code and it worked perfectly. I made some minor modifications so it asked the user for the size of the matrix:
            Code:
            cols=input("How many columns will be in the matrix?: ")
rows=input("How many rows will be in the matrix?: ")
            I also implemented a While function so it asked the user to write as many strings as rows, each one as long...
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              Leave a comment:

            • RodAG
              started a topic Filling a list of lists...
              in Python

              Filling a list of lists...

              Here's my problem.
              I need a matrix (a list of lists) of undefined size (maybe I should define it as an empty list?). The matrix will have a size of nxm but n and m will be introduced by the user.
              Now, the user will also introduce the values for the matrix as a string, for example: list[0]="Hello" but I need to store that string as a list of 5 elements list[0]=[H, e, l, l, o]
              Is there a not so complicated way to do that?...
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