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variance.204
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variance.204
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* simple demo adapted from https://m204wiki.rocketsoftware.com/index.php/Variance_(Arraylist_function)
*-----------------------------------------------------------------------------*
* Find variance of distance from origin for coordinate list. *
*-----------------------------------------------------------------------------*
b
class point
public
constructor new (%x is float, %y is float)
variable x is float
variable y is float
end public
constructor new (%x is float, %y is float)
%this:x = %x
%this:y = %y
end constructor
end class
*------------------------------------------------------------*
* Calculate distance from origin. (Pythagorean hypotenuse) *
*------------------------------------------------------------*
local function (point):distance is float
return (%this:x:toPower(2)+%this:y:toPower(2)):squareRoot
end function
%al is arrayList of object point
%al = new
%al:add(new(1,1))
%al:add(new(3,4))
%al:add(new(-5,12))
%al:add(new(0,0))
%al:add(new(-1,-1))
*------------------------------------------------------------*
* Useful applications obvious. *
*------------------------------------------------------------*
skip 2 lines
for %i from 1 to %al:count
print %i with %al(%i):distance at 12
end for
print "-----------------" at 12
*------------------------------------------------------------*
* Having this canned is the amazing bit. *
*------------------------------------------------------------*
print "variance: " with %al:variance(distance) at 12
skip 2 lines
end