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  3. What is the most efficient approach to record each line...

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What is the most efficient approach to record each line from a input file ?

Charley Chen
Charley Chen over 14 years ago

 Hi All,

I use table to record each line & its value , but it will become slower and slower when time left .

Though I can get table[A11100] = list(1000000 2000000 3000000 4000000) very quickly , But must when it finished loop.

What is the best way to do it ?

;write a template file
        ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 
        getCurrentTime()
        outPort = outfile("test")
        count = 1000000
        fileCount = 1
        for(i 1 count
            fprintf(outPort "1000000 2000000 3000000 4000000\n")
        );   
        close(outPort)
        getCurrentTime()
        ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 

        ;read each line to record
        ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; 
        nextLine = nil
        inPort = infile("test")
       getCurrentTime()
 when(inPort
      fileCount = 1
      table = makeTable("table" nil)
      while(gets(nextLine inPort)
              qq = parseString(nextLine "\n")
              str = sprintf(nil "A%d" fileCount)
              table[str] = list(1000000 2000000 3000000 4000000)
              fileCount++
      );while   
 );when
      inPort = nil
      getCurrentTime()
        ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

 

Thank you,

Charley

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  • Andrew Beckett
    Andrew Beckett over 14 years ago

    Charley,

    No, that won't help. The issue in your case was the allocation of the strings used as keys, and the list cells used as values. Splitting the table into multiple pieces wouldn't help that - it's the same amount of keys and the same amount of values. It would just make it harder to code, and add no value (in fact it would probably take more memory, in fact).

    So it's not the table that is the issue here - it's the keys and values that are the problem.

    Regards,

    Andrew.

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  • Andrew Beckett
    Andrew Beckett over 14 years ago

    Charley,

    No, that won't help. The issue in your case was the allocation of the strings used as keys, and the list cells used as values. Splitting the table into multiple pieces wouldn't help that - it's the same amount of keys and the same amount of values. It would just make it harder to code, and add no value (in fact it would probably take more memory, in fact).

    So it's not the table that is the issue here - it's the keys and values that are the problem.

    Regards,

    Andrew.

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