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read in text file containing numerical data and store in list

MarkAL

Hi, 

I need to read in a text file that contains x,y coordinate pairs as comma separated values and a newline between x,y pairs. The format would look like this: 

x1,y1
x2,y2
x3,y3
...
xN,yN

I would like to like to take these values and store them in a list:

MyList = list( list(x1,y1) list(x2,y2) list(x3,y3) ... list(xN,yN) )

I saw the "read" function can read in a text file line by line. Do I need to then write my own parsing scripts to store the data in the way I would like it? 

Thanks,
Mark

  • Hi Mark,

    lineread() is probably easier, since it will read both numbers on the line at once; read would only read one value at a time, which makes more work.

    I also used tconc so that the list can be constructed in the right order (the alternative is to use cons to add each point on at the beginning of the list, and then call reverse() at the end). The car(points) at the end is to remove the tconc nature of the list (the info pointing to the end of the list).

    points=nil
    port=infile("coords.txt")
    when(port
      while(data=lineread(port)
        points=tconc(points data)
      )
      close(port)
      points=car(points)
    )

    Regards,

    Andrew.

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