Hi, Since these questions have nothing really to do with SageMath*Cloud* itself, I think you'll get much quicker and better responses at
https://groups.google.com/forum/#!forum/sage-support On Fri, Feb 3, 2017 at 9:46 AM, <[email protected]> wrote: > Following up on my earlier post, here are a couple of examples of how I use > Mathematica and would like to know the right way to do it in SAGE (I > actually know how to do the first one in SAGE, but probably not in the best > way): > 1) Finding the intersection of a generic tangent line to f(x) with f(x): > f[x_]:= x^2(x^2-1) > L[a_,x_]:=f[a]+f'[a](x-a) > Solve[L[a,x]==f[x],x] > > 2) Testing if |f(z)| < f(|z|) for various choices of f: > Pl[f_,r_]:=Plot[Abs[f[r Exp[I t]]]/f[r],{t,0,2Pi}] > > Thanks for any suggestions. > > > On Friday, January 20, 2017 at 4:45:43 AM UTC-6, [email protected] wrote: >> >> Thank you. I will be sure to post my questions here... >> >> >> On Wednesday, January 18, 2017 at 9:01:10 PM UTC-6, William Stein wrote: >>> >>> There is no such list. Make a list of questions and we would love to >>> answer all of them! >>> >>> E.g., the first answer is: >>> >>> %time computation >>> >>> to time it once, and >>> >>> %timeit computation >>> >>> to run many timings and provide an average. >>> >>> You can also do >>> >>> --- >>> %time >>> a bunch >>> of code in a cell >>> --- >>> >>> and >>> >>> >>> --- >>> %timeit >>> a bunch >>> of code in a cell >>> --- >>> >>> in a Sage worksheet. >>> >>> >>> https://cloud.sagemath.com/projects/4a5f0542-5873-4eed-a85c-a18c706e8bcd/files/support/2017-01-18-185633-timing.sagews >>> >>> --- >>> >>> Regarding 2d and 3d graphics, things are much like mathematica, except >>> use lowercase and underscores and parenthesis, so >>> >>> ContourPlot[y^2 + 1 - x^3 - x, {y, -pi, pi}, {x, -pi, pi}] >>> >>> becomes >>> >>> %var x, y >>> contour_plot(y^2 + 1 - x^3 - x, (y,-pi,pi), (x,-pi,pi)) >>> >>> Note that you have explicitly declare x and y to be symbolic variables. >>> >>> Type contour_plot? to learn a lot about contour_plot, and see tons of >>> examples. Also, a good way to find sage docs is to google for "sage" and >>> "something else"... >>> >>> -- William >>> >>> On Wed, Jan 18, 2017 at 2:17 PM <[email protected]> wrote: >>>> >>>> I apologize if this has been discussed already. I tried to search the >>>> group but with no results. >>>> >>>> I am new to SAGE but I have used Mathematica for a long time. I wonder >>>> if there is a sort of "dictionary" Mathematica->SAGE that will allow me to >>>> quickly find how to do with SAGE what I already know how to do with >>>> Mathematica. >>>> >>>> For example, right now I would like to know how long a computation >>>> takes. In Mathematica, this is done with the command Timing[computation]. >>>> How can it be done in SAGE? >>>> >>>> Of course there are plenty of other Mathematica commands that I would >>>> like to "translate" to SAGE, and while the already available help pages and >>>> tutorials help, it always takes me some time to find out how to do what I >>>> already know how to do instantly in Mathematica. >>>> >>>> Thank you for any help or suggestions. >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> >>>> -- >>>> >>>> >>>> You received this message because you are subscribed to the Google >>>> Groups "sage-cloud" group. >>>> >>>> >>>> To unsubscribe from this group and stop receiving emails from it, send >>>> an email to [email protected]. >>>> >>>> >>>> To view this discussion on the web visit >>>> https://groups.google.com/d/msgid/sage-cloud/3cabe2b1-2322-4e0d-8adf-2feba0a7a9a9%40googlegroups.com. >>>> >>>> >>>> For more options, visit https://groups.google.com/d/optout. >>>> >>>> > -- > You received this message because you are subscribed to the Google Groups > "sage-cloud" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/sage-cloud/24c81ab5-9e89-4849-8a2a-07dc1ca96f6b%40googlegroups.com. > > For more options, visit https://groups.google.com/d/optout. -- Best Regards, William Stein CEO, SageMath, Inc. -- You received this message because you are subscribed to the Google Groups "sage-cloud" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/sage-cloud/CA%2BjwZMiO4u0MqC_hq8Dvg90FRUgULj55e_LbGF55ei0aCxObqA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
