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(49g 50g) Shoelace algorithm
08-25-2018, 03:17 PM
Post: #14
Thomas Klemm Offline
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RE: ( HP49/50) Shoelace algorithm
(08-25-2018 02:02 PM)Albert Chan Wrote:  2*A = sum((x*yr - xr*y))
= sum(xr^2 - xr*y + x*yr + x^2)
= sum((xr + x)(yr - y))

I assume that this should rather be:

2*A = sum(x*yr - xr*y)
= sum(xr*yr - xr*y + x*yr - x*y)
= sum((xr + x)(yr - y))
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(49g 50g) Shoelace algorithm - John Keith - 08-23-2018, 02:20 PM
RE: ( HP49/50) Shoelace algorithm - Thomas Klemm - 08-25-2018 03:17 PM



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