Instead of:
gamma=vector([t,t^2,t^3])
use:
gamma=vector([t,t^2,t^3]).function(t)
Alternatively, keep gamma as is and use gamma(t=x) instead of gamma(x).
On Thursday, September 9, 2021 at 1:18:52 PM UTC-7 Federico Galetto wrote:
> Hello, I get a warning due to function-call syntax deprecation and I don't
> understand how to fix it despite looking at other similar conversations.
>
> Here is the setup for my code:
>
> t=var('t')
> gamma=vector([t,t^2,t^3])
> curve=parametric_plot(gamma,(t,-2,2),color='black',radius=0.02)
> v=derivative(gamma,t)
> T=v/v.norm()
> Tp=derivative(T,t)
> N=Tp/Tp.norm()
> B=T.cross_product(N)
>
> This code creates the plot of a space curve and computes T,N,B which are
> unit tangent, normal, and binormal vectors. Now I want to create an
> interactive 3d plot:
>
> def frame(x):
> pT = T(x).plot(start=gamma(x),radius=0.02)
> pN = N(x).plot(color='red',start=gamma(x),radius=0.02)
> pB = B(x).plot(color='green',start=gamma(x),radius=0.02)
> frenet = pT + pN + pB
> whole = frenet + curve
> return whole
> a = animate([frame(x) for x in srange(-0.5,1.5,.02)])
> a.show()
>
> Although this works, I get the syntax deprecation warning at the line 'a =
> animate(...'.
>
> Any help is greatly appreciated!
> Fred
>
>
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