History of quickMedian

== Syntax ==

int quickMedian(int low, int high)

== Arguments ==

:low

:: lowest put/get cell that contains values, usually zero.

:high

:: highest put/get cell that contains values, usually calculated as (radius*2+1) * (radius*2+1)

== Return ==

The return value is the median value.

== Description ==

Finds the median value within the given range of put/get cells.

== Comments ==

Please notice that quickMedian works fast for radius values from 1 to 8, but above that it gets very slow. There are much faster algorithms that use tables or histogram for calculating median values with a high radius. There are also slightly faster algorithms for medians with a radius of 1 or 2.

== Example ==

<code>

%ffp

ctl(7): "Radius", range=(1,15), val=1, page=1

ForEveryTile:

for (y=y_start; y < y_end; y++)

for (x=x_start; x < x_end; x++)

for (z=0; z < 3; z++) {

quickFill(x,y,z,0,ctl(7),0,0,X,Y);

pset(x,y,z,quickMedian(0,(ctl(7)*2+1)*(ctl(7)*2+1)-1));

}

return true;

</code>

== See Also ==

quickFill