I'm not sure I understand the question, but in python, you can get the first and elements of most types of sequences with e.g., X[0] and Y[-1], respectively.
Is the second part of your question just a dot product? On Sat, Jan 27, 2018 at 10:07 PM, Vincent Douce Mathoscope < mathosc...@netcourrier.com> wrote: > hi > i have 2 questions > > - i have a parametric plot : > T=np.linespace(things) > X=f(T)*np.cos(T) > Y=f(T)*np.sin(T) > i would like to get the first and the last point of this polar curve > in the specs of "linspace" (https://docs.scipy.org/doc/ > numpy/reference/generated/numpy.linspace.html) i dont see how to do that > automatically > is there something simple like "first(X)" and "last(X)" > > - i have a function : > rotation(vect,theta) which takes vect=[a,b] and theta-rotates it by a > matrix > how to use this function or such a function to rotate a tuple (X,Y) with > X,Y as described above in this message ? > > –––––––––––––––––––––––––– > Vincent Douce > :=: Mathoscope :=: > http://mathoscope.xyz > 06°13°11°07°26 > Bagnères de Bigorre 65200 > > > > > > _______________________________________________ > NumPy-Discussion mailing list > NumPy-Discussion@python.org > https://mail.python.org/mailman/listinfo/numpy-discussion > >
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