# [lp_math_median]

 Link lp_math_median Author Bil Corry Category Math Version 8.x License Public Domain Posted 03 Dec 2005 Updated 04 Dec 2005 More by this author...

#### Description

Returns the median average value given an array of values.

Note: Requires [lp_integer_odd], [lp_decimal_precisionSet], and [lp_math_mean]

#### Sample Usage

```(lp_math_median: (:10,2,3,4,1), 2);
'';
(lp_math_median: (:10,2,4,6,7,1), 2);
```

#### Source Code

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```[

define_tag:'lp_math_median',
-description='Returns the median average value given an array of values.',
-priority='replace',
-required='numbers', -type='array',
-optional='precision';

// did we get a precision?
if:!(local_defined:'precision');
// nope, set it to zero
local:'precision' = 0;
/if;

// convert array of items into array of lp_decimals
local:'numbers_array' = array;

iterate: #numbers, local:'number';
#numbers_array->(insert: (decimal: #number));
/iterate;

// sort in order
#numbers_array->sort;

local:'midpoint' = integer:(math_ceil: (decimal: (decimal: #numbers_array->size) / (decimal: 2)));

if: (lp_integer_odd: #numbers_array->size);
return: (lp_decimal_precisionSet: (decimal: #numbers_array->(get: #midpoint)), (integer:#precision));
else; // even
return: (lp_decimal_precisionSet: (lp_math_mean: (array:(decimal: #numbers_array->(get: #midpoint)),(decimal: #numbers_array->(get: #midpoint + 1)))) , (integer:#precision));
/if;

/define_tag;

]```