Re: [sage-support] Re: Trouble getting *collect* to work with derivatives.

What are computed operators? Are those the D[0, 0] things? How avoid those? Is that same as second derivative of 1st variable? On Sun, Jan 24, 2021, 11:33 AM Emmanuel Charpentier < emanuel.charpent...@gmail.com> wrote: > Probably because “the given second derivative” has a “computed operator”…

Re: [sage-support] Calling Words in a function gives an error

On Thursday, January 21, 2021 at 7:21:52 AM UTC-8 Nikos Apostolakis wrote: > Dear Vincent, > > Thank you very much, that fixes it. > > IMHO this is a bug though, or at least an inconsistent behavior. Most of > the time Sage silently coerces things to the appropriate type so commands > just

[sage-support] Re: Trouble getting *collect* to work with derivatives.

I suspect you want to collect wrt. the second partial derivatives of f(x,y,z,t) with respect to x,y,z,t ; evaluated at xp,yp,zp,tp. Those are not the same as the partial second derivatives of f(xp,yp,zp,tp) with respect to (x,y,z,t). If you inspect what derivative(f(xp, yp, zp, tp), x, 2)

Re: [sage-support] Sage Crash Report

at the bottom of the log you see ImportError: /home/mathieu/opt/SageMath/local/lib/python3.8/site-packages/sage/matrix/matrix_modn_sparse.cpython-38-x86_64-linux-gnu.so: undefined symbol: _ZNK6Givaro7IntegercvNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEEB5cxx11Ev which is an indication

Re: [sage-support] Re: Trouble getting *collect* to work with derivatives.

Dear Christian, Given the specifications, I suspect that the function collect only works for variables. And indeed sage: expr = (x+y)*(z+t) + (x+y)*(1+z^2) + 2 sage: expr (z^2 + 1)*(x + y) + (t + z)*(x + y) + 2 sage: expr.collect(x+y) (z^2 + 1)*(x + y) + (t + z)*(x + y) + 2 Instead

Re: [sage-support] Re: Trouble getting *collect* to work with derivatives.

Probably because “the given second derivative” has a “computed operator”… BTW : var("x,y,z,t,v,c") f=function("f") xp=(t-v*x)/sqrt(1-v^2/c^2) yp=y zp=z tp=(t-v*x/c^2)/sqrt(1-v^2/c^2) foo=(sum(map(lambda u:derivative(f(xp,yp,zp,tp),u,2), (x, y,

Re: [sage-support] Re: Trouble getting *collect* to work with derivatives.

Emmanuel But my question is more simple than that. I just want to know why the collect method was not able to collect all the terms with the given second derivative. On Sun, Jan 24, 2021, 2:15 AM Emmanuel Charpentier < emanuel.charpent...@gmail.com> wrote: > Sage has recently acquired a large

[sage-support] Sage Crash Report

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[sage-support] Re: Trouble getting *collect* to work with derivatives.

Sage has recently acquired a large set of tools relative to manifolds . A look at these tools and related tutorials/references may be in order… HTH, Le samedi 23 janvier 2021 à 23:17:26 UTC+1, cseb...@gmail.com a écrit : > What you intend to do isn’t really