[Year 12 SofDev] Selection / quick sort and SNAP

Fri Jul 29 10:39:30 AEST 2016

Have been playing with SNAP as a great resource for 7- 11 IT programming. Preparing a lesson on selection and quick sorts using SNAP. Has anyone done this?
Regards
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John Pasztor
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On Jul 28, 2016, at 5:19 PM, David Dawson <David.Dawson at wesleycollege.net<mailto:David.Dawson at wesleycollege.net>> wrote:

Curiously, while I am not sure what each of my students will do with the sort requirement - other than doing one; I have advised them to study what the programming language actually does.
I was very interested myself to see that Java arrays.sort utilises three different sorts according to how it is used. Selection, quick or merge.
The PHP inbuilt sort merely uses quick sort apparently.
So I would suggest that any student who does not use hand-coded sorts (which are actually redundant unless you are programming your own specialist binary tree or something - and WHO does that? - possibly some google experts) should be able to tell us in their report - to outline WHY the sort they use is good for their data and more efficient and better than a bubble sort which is easy to program.
Dave

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From: sofdev-bounces at edulists.com.au<mailto:sofdev-bounces at edulists.com.au> [sofdev-bounces at edulists.com.au<mailto:sofdev-bounces at edulists.com.au>] on behalf of Paragreen, Chris J [paragreen.chris.j at edumail.vic.gov.au<mailto:paragreen.chris.j at edumail.vic.gov.au>]
Sent: 28 July 2016 17:08
To: Year 12 Software Development Teachers' Mailing List
Subject: Re: [Year 12 SofDev] Query about marking SAT 2 criteria 6

“but it is easy to demonstrate that quicksort is usually more efficient than selection sort”

Yes, but if you add an item to the end of a sorted list, a selection sort will be more efficient to re-sort the list than quicksort. So if student’s maintained their data in a sorted state, I’d happily accept them to justify using a selection sort rather than a quicksort on this basis.

Oh, and I’ve encouraged my students to code their own sorting algorithm to give them access to more marks in the other coding criteria of the SAC. Of course, if they want to use the built in sort, they’re welcome to!

Chris

From: sofdev-bounces at edulists.com.au<mailto:sofdev-bounces at edulists.com.au> [mailto:sofdev-bounces at edulists.com.au] On Behalf Of Robert Hallworth
Sent: Thursday, 28 July 2016 3:25 PM
To: Year 12 Software Development Teachers' Mailing List <sofdev at edulists.com.au<mailto:sofdev at edulists.com.au>>
Subject: Re: [Year 12 SofDev] Query about marking SAT 2 criteria 6

This is my spin on this

“Skills in using a programming language ” this to me is a coding criteria so ..

Documentation is the internal documentation
Complex. I have told my students Quicksort

Sorting is a Science in itself and reasons for which sort to use get very complicated but it is easy to demonstrate that quicksort is usually more efficient than selection sort

I think this list pointed out  http://sorting.at/ does a good job of visually comparing sorts.

kind regards

Robert K Hallworth
Director of Learning Technology
Mobile:0431 892 398
Ext 640
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From: sofdev-bounces at edulists.com.au [mailto:sofdev-bounces at edulists.com.au] On Behalf Of Tran, Vi V
Sent: Thursday, 28 July 2016 2:55 PM
To: Year 12 Software Development Teachers' Mailing List <sofdev at edulists.com.au>
Subject: [Year 12 SofDev] Query about marking SAT 2 criteria 6

Hi all,
  I'm not sure if it has been answered on this edulist, but I have a question about marking Criteria 6 where it states "Documents the efficient use of a complex sorting algorithm in the solution".

From my interpretation does this mean that students HAVE to use a sorting algorithm (they can choose from insertion, bubble, selection or quick sort? )

Complex means - they can only choose from selection and quick sort ( and not insertion or bubble sort)?
Document means - they need to explain and justify why they used the particular sorting algorithm? In terms of time complexity and usage of memory space?

I was wondering how others are marking this criteria.

Thank you.

From Vi.
Mullauna College.

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