Hi all -
To calculate the area of a flat triangle, using Heron's formula,
A(a,b,c)= sqrt( s2*(s2-a)*(s2-b)*(s2-c) )
I wrote a simple function doing this:
* get the three sides (as list input y)
* compute the half perimeter s2
* build the differences s2-y
* build product
* take square root
My explicit solution looks like this
taher=: 13 : '%: s2 * */ s2-y [ s2=. -: +/ y'
and works
taher 3 4 5
6
Suggested tacit version looks like this (and works too)
tahert=: [: %: ([: -: +/) * [: */ ([: -: +/) - ]
Q: Is there a way to reference the intermediate result of ([: -: +/)
the half perimeter s2
within the tacit expression, as has been done in the explicit..?
[Guess the interpreter takes care of this anyway; my question aims at
whether a shorter formulation could be reached.]
Thanks
-M
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