[Nottingham] Introduction and Java Question
Peter.Chang at nottingham.ac.uk
Sun Oct 19 17:09:16 UTC 2008
On Sun, 19 Oct 2008, Jason Liquorish wrote:
Looking at your code more closely, there's issues with 0-indexing, upper
bounds on your array access, whether Java arrays are zero-initialised (I
don't know Java) and the use of frequency.length as the upper limit
(rather than freqIndex).
The fix you made doesn't do what you mean. Think carefully about what
>> Easy way to find the modal points is scan through your frequency
>> array and find the matches to "max".
> I was using the frequency array to contain a number that indicates how
> many times the number at that index occurs, then just print the index
> of medianArray to return the number that is the mode.
My point in the above is if there are a number of entries in the frequency
array that are equal to the maximum frequency then it is easy to find and
print out the corresponding numbers.
>> latter, you should be looking at histogram binning.
> This is totally new to me as we have not gone this in-depth/advanced
> yet. I doubt we even will as it is only a Level 3 course.
This is just basic statistics. If you're measuring some quantity that is
described by a real number (eg, lengths of pieces of string as opposed to
shoe size numbers) then the usual practice is to tally occurrences in
discrete ranges (eg, 0-1cm, 1-2cm, etc) rather than look for exact matches
as it's unlikely you will find, for example, two pieces of string
measuring 1.23cm exactly.
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