Problem extending curve

[Yna_Db]

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Quick help with Curve.ExtendStart

Hello, I want to shorten the start point of my curve by a certain distance. I was trying to use Curve.ExtendStart with a negative value but it does not accept that even though the input type is double. Is there any such node available which could do this? Essentially what I want is just a reverse of this node. I was trying to find some direct node to Shorten it but I couldn’t find any (apart from one node in Dynamo Rebar, but that shortens it from both ends which I don’t want) The curve I wan…

http://dynamobim.org/forums/topic/curve-extend/
http://dictionary.dynamobim.com/#/Geometry/Curve/Action/Extend

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