mediann

The mediann function returns the median value of a general lua table that may contain non-numeric values, named keys, and sub-tables. Only numeric values found in the table are used in the calculation. The mediansdevn function returns both the median and standard deviation. The related median function calculates the median of a 1-dimensional array, CImage, or list of numbers. Since an array is a specific type of table that contains only numbers or sub-tables, this function can also be used for arrays.

Syntax

nMedian = mediann( tbl )

bullet.gif    tbl is a general lua table.

bullet.gif    nMedian is the median value of the table.

Examples

The following script returns the median of a 1-dimensional array containing 1 million random numbers.

t = random( 1000000 )

-- create an array of numbers

v = mediann( t )

-- find the median & standard deviation

Printf("Median=%lg\n", v )

-- list the result

  

The next example computes the median of an ugly, complex table:

t = { 6, -2, 15, "a", {5,"b"}, c="5.4" }

 

v = mediann(t)

-- find the median and standard deviation

Printf("M= %lg\n", v )

-- result: Median = 5.5, based on only 4 numbers

Related Topics

Table and Array Functions, mediansdevn, rankn, meann, sdevn, meansdev


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