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Added dflt= arg to sum(), defaulting to 0.

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Revar Desmera
2020-02-08 21:54:39 -08:00
parent a78973187a
commit 019961aef7
3 changed files with 9 additions and 4 deletions
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math.scad
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@@ -428,14 +428,16 @@ function lcm(a,b=[]) =
// Description:
// Returns the sum of all entries in the given list.
// If passed an array of vectors, returns a vector of sums of each part.
// If passed an empty list, the value of `dflt` will be returned.
// Arguments:
// v = The list to get the sum of.
// dflt = The default value to return if `v` is an empty list. Default: 0
// Example:
// sum([1,2,3]); // returns 6.
// sum([[1,2,3], [3,4,5], [5,6,7]]); // returns [9, 12, 15]
function sum(v, _i=0, _acc) =
_i>=len(v)? _acc :
sum(v, _i=_i+1, _acc=is_undef(_acc)? v[_i] : _acc+v[_i]);
function sum(v, dflt=0, _i=0, _acc) =
_i>=len(v)? (len(v)? _acc : dflt) :
sum(v, dflt=dflt, _i=_i+1, _acc=is_undef(_acc)? v[_i] : _acc+v[_i]);
// Function: cumsum()