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  3. Splitting a large list

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Splitting a large list

vramanax
vramanax over 10 years ago

Hi

Basically I am looking for a way to split a large list into smaller chunks

lets say into minimum chunk size of 100s

I am working on a function myself but I thought I will save some time if any of you can help me to solve it

Regards

Venkata

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  • fxffxf
    fxffxf over 10 years ago

    It you are lucky to be on Linux use the split command


    Windows, you can download cygwin package and use the split command on that package. or download perl where code exists to split a file

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  • vramanax
    vramanax over 10 years ago

    Hi thanks Here is a solution I came up with

    assume a list of objects is more than 100

    then you use the following call

    __bReakList(llist)

    I have 2 procedures

    procedure( __bReakList(_lIst)
    prog((i __rEturnList __ChunkSize __RemainderChunk _tList)
    i=0
    __ChunkSize = length(_lIst)/100
    __RemainderChunk = mod(length(_lIst) 100)
    __rEturnList = list()
    while(i < (length(_lIst) - __RemainderChunk)-1
    __rEturnList = cons(__sPlitList(_lIst i i+99) __rEturnList)
    i = i + 100
    )
    _tList = list()
    for(i length(_lIst) - __RemainderChunk length(_lIst)-1
    _tList = cons(nth(i _lIst) _tList)
    )

    __rEturnList = cons(_tList __rEturnList)
    i = 0
    return(__rEturnList)
    )
    )

    procedure( __sPlitList(iNList sTartIndex eNdIndex)
    prog((_tList)
    _tList = list()
    for(i sTartIndex eNdIndex
    _tList = cons(nth(i iNList) _tList)
    )
    return(_tList)
    )

    )

    it is something,

    I am using this test a bigger program to see if it makes any difference in processing a huge list at one shot or processing them 100 at a time

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  • vramanax
    vramanax over 10 years ago
    You can modify the procedure to include the chunk size as input instead of hard coding to 100
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