Solved

median of 2 numbers. how to?

Posted on 2013-05-16
6
340 Views
Last Modified: 2013-05-31
I have 2 numbers and trying to find median of those two eithout taking average manually but with built in functions. Any functions in javascript or prolog?

REGARDS.
0
Comment
Question by:jazzIIIlove
6 Comments
 
LVL 37

Accepted Solution

by:
TommySzalapski earned 375 total points
ID: 39172056
I don't think there is a built in median function in JavaScript. If you just want the median of two numbers, then it is the same as the mean (average), just (num1+num2)/2

Here is a function for median in JavaScript
http://rosettacode.org/wiki/Averages/Median#JavaScript
And one for Prolog on the same page
http://rosettacode.org/wiki/Averages/Median#Prolog
0
 
LVL 37

Assisted Solution

by:TommySzalapski
TommySzalapski earned 375 total points
ID: 39172066
The reason that it isn't usually a built in function is that it requires sorting the data to find the median. The most efficient sorts are "in-place" (i.e. they move the data around in the original array) so you would need to copy the array if you wanted to find the median without rearranging everything.
0
 
LVL 12

Author Comment

by:jazzIIIlove
ID: 39172370
Please assume they are sorted and only 2 numbers.


Regards.
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 
LVL 37

Assisted Solution

by:TommySzalapski
TommySzalapski earned 375 total points
ID: 39172593
function median(a, b) {
    return (a+b)/2;
}

Open in new window


Or if they are in an array
function median_array_of_2(ary) {
    return (ary[0]+ary[1])/2;
}

Open in new window

0
 
LVL 33

Expert Comment

by:sarabande
ID: 39174101
the definition of median function for an even number of values may be arbitrary. sometimes, it is required that the median value matches at least one of the values of the set. if so, for an even count you may have two medians (low and high) which are the two middle values of the sorted set.

Sara
0
 
LVL 48

Assisted Solution

by:PortletPaul
PortletPaul earned 125 total points
ID: 39203738
A Median is the mid-point of a "sample" but when the "sample" is an even number no true mid-point exists. The most typical way to treat this is to then take the mean (average) of the 2 points being before and after the mid-point. Some approaches differ and will choose either the 'before' value or the 'after' value instead of using the mean of those 2 points.

The statistical significance of a sample that is only of 2 values is so low that you really have not much choice except to use the average as any other technique applied would just produce an absurd bias.

http://en.wikipedia.org/wiki/Median
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Nothing in an HTTP request can be trusted, including HTTP headers and form data.  A form token is a tool that can be used to guard against request forgeries (CSRF).  This article shows an improved approach to form tokens, making it more difficult to…
This article discusses how to create an extensible mechanism for linked drop downs.
In this fourth video of the Xpdf series, we discuss and demonstrate the PDFinfo utility, which retrieves the contents of a PDF's Info Dictionary, as well as some other information, including the page count. We show how to isolate the page count in a…
In this seventh video of the Xpdf series, we discuss and demonstrate the PDFfonts utility, which lists all the fonts used in a PDF file. It does this via a command line interface, making it suitable for use in programs, scripts, batch files — any pl…

919 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

14 Experts available now in Live!

Get 1:1 Help Now