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Add lists to a master list

RVERP

Hi, i want to add a list to a 'master' list.  I want to use to cons function for this.

masterList = cons(list_3 masterList)

 This works, no problem, only the number of the list to be added is determened by the i in a for loop.

 for( i 1 20
masterList = cons( "list_i" masterList))

  I don't know what function to use that gives the correct return for "list_i"

Parents

  • Building lists of lists is perfectly reasonable and common place.

    Storing lists in variables where part of the variable name is something that needs to be evaluated later with symeval is the bit I was questioning. You're effectively creating a pseudo-array list_N where N changes to reflect which list you're talking about. Since symbols are not garbage collected, you'd be better off using an array or an association table (hash table) to do that part, even if you then build a list of lists at the end. Or build up the list of lists as you go along, and avoid the intermediate "array" storage.

    Regards,

    Andrew.

Reply

  • Building lists of lists is perfectly reasonable and common place.

    Storing lists in variables where part of the variable name is something that needs to be evaluated later with symeval is the bit I was questioning. You're effectively creating a pseudo-array list_N where N changes to reflect which list you're talking about. Since symbols are not garbage collected, you'd be better off using an array or an association table (hash table) to do that part, even if you then build a list of lists at the end. Or build up the list of lists as you go along, and avoid the intermediate "array" storage.

    Regards,

    Andrew.

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