# [Numpy-discussion] linspaces

Paul Hobson pmhobson at gmail.com
Sun Jan 28 01:28:06 EST 2018

```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 <
mathoscope at 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
>
>
>
>
>
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