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how to declare an array of unknown size

Sri Charan B

Hi,

I am trying to implement a code where i came in need of an array which can increase the size of the array during the runtime. I mean the size of the array shall not be declared using the 'declare' command but during the run time if new elements are to be added into that array i will use it or else the array shall be empty.

I need this because i am at a juncture where i cannot expect or fix the size of the array to a particular value so guys please help me.

Thanks in advance for any help,

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  • Andrew Beckett

    I didn't expect you to want to use a multi-dimensional array - that was simply an example to show that the size of the array does not need to be a constant - it can be declared on the fly.

    Lists can of course be added to dynamically. Rather than trying to teach you the basics of SKILL, I would strongly suggest that you read the SKILL Language User Guide, particularly the Getting Started chapter which talks about SKILL Lists - and indeed the first few chapters. Lists are pretty fundamental in SKILL and if you don't know how to manipulate them, you're going to get stuck quite quickly.

    The document can be found in cdsdoc (if using IC5141) or cdnshelp (if using IC61), or you can just open <ICinstDir>/doc/sklanguser/sklanguser.pdf

    Note that you should be aware that lists are sequential structures, so adding things onto the beginning of a list is a lot more efficient than adding on the end, and if you find yourself using nth() to access list elements it probably means you are doing things the wrong way (as I said, lists are not arrays). There's a chapter in the user guide on optimisation of code too. Think of the manual as being like a book on programming SKILL that you might buy in a bookshop.

    Regards,

    Andrew.

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  • Andrew Beckett

    I didn't expect you to want to use a multi-dimensional array - that was simply an example to show that the size of the array does not need to be a constant - it can be declared on the fly.

    Lists can of course be added to dynamically. Rather than trying to teach you the basics of SKILL, I would strongly suggest that you read the SKILL Language User Guide, particularly the Getting Started chapter which talks about SKILL Lists - and indeed the first few chapters. Lists are pretty fundamental in SKILL and if you don't know how to manipulate them, you're going to get stuck quite quickly.

    The document can be found in cdsdoc (if using IC5141) or cdnshelp (if using IC61), or you can just open <ICinstDir>/doc/sklanguser/sklanguser.pdf

    Note that you should be aware that lists are sequential structures, so adding things onto the beginning of a list is a lot more efficient than adding on the end, and if you find yourself using nth() to access list elements it probably means you are doing things the wrong way (as I said, lists are not arrays). There's a chapter in the user guide on optimisation of code too. Think of the manual as being like a book on programming SKILL that you might buy in a bookshop.

    Regards,

    Andrew.

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