List Commands Library for 50g

[DavidM]

(08-25-2017 12:36 PM)John Keith Wrote:  The problem with that method is that lists require a lot more memory and processing time than strings. I routinely work with strings of 10000 - 20000 characters. Commands such as POS, SUB, and SREPL process such strings in a fraction of a second. A list of 20000 characters requires 120KB of memory which is impractical on the HP 50.

What I was wishing for is an analog of SREPL which, instead of modifying the string, would return a list of indexes where the pattern was found.

Example:

"the cat in the hat"
"he"
-> { 2 11 }

I realize that your library is primarily a list library rather than a string library but I can see the need for an expanded suite of string functions as well.

John

The nature of a string being a "specialized list of characters" is the rationale I've used in my head to justify the string functions that I've already included. I can still see including this functionality with the "new" MPOS, but the scope as you have described obviously changes the needed approach. Not just in terms of the size of the objects in question, but also in its consideration of substrings of varying length.

You regularly deal with strings of 10-20K characters on your calculator? That's a paradigm shift for me. I wouldn't have ever considered using the 50g for that kind of processing. Thanks for clarifying!