Hi,
On Tue, May 12, 2015 at 10:48 AM, Brenton wrote:
> Hi, I'd like to numerically integrate a simple pendulum problem:
>
> y'' = -9.8*cos(y)
> y,yd = var('y,yd')
> f= [0,-9.8*cos(y)]
> v= [y,yd]
I think your f is wrong. Shouldn't it be:
f = [yd, -9.8*cos(y)]
Cheers,
--
Vegard
--
Yo
Hi, I'd like to numerically integrate a simple pendulum problem:
y'' = -9.8*cos(y)
y(0) = 0
y'(0) = 0
I have tried this code (based on the Lotka-Volterra example in the Sage
documentation):
from sage.calculus.desolvers import desolve_odeint
y,yd = var('y,yd')
f= [0,-9.8*cos(y)]
v= [y,
Hi all,
I want (my students) to plot Cornu's spiral, givent in parametric form by
x(t) = integral cos(pi/u^2/2), u going from 0 to t , and y(t) defined
analogously using the sine function. The integral connot be evaluated
symbolically, I guess.
The first attempt would be
parametric_plot([inte
Dear all,
I am new to sage and I have a problem with the integrate-command that I
cannot explain and whose error message I don't really understand. Here's
what it looks like: If I do quite simple integration
Dear all,
I am quite new to sage and right now I'm trying to perform quite a simple
numerical integration of the following form:
sage: integral(exp(-300.0/(-0.064*x+14.0)),x,0.0,120.0)
If I simply put "x" into the denominator instead of the linear function it
works fine. However, as shown, it
Hello Everyone,
I know numerical integration isn't great in SAGE, but I think the
following isn't too complicated. I try
sage: numerical_integral(imaginary(gamma(1-I*t)),-15,15)
which fails, and give a LONG error message. I won't put the whole
thing here, but it starts:
ERROR: An unexpected e
I am trying to numerically evaluate the integral of bessel functions.
I've tried constructing it various ways. The one that makes most
sense to me is:
a=var('a')
f=bessel_J(1,a)*bessel_J(0,0.1*a)*e^(-5*a)
f.numerical_integral(a,0,infinity)
I get the error: Cannot evaluate symbolic expression to
Hi,
I need to integrate an expression (two-dimensional fourier spectrum,
i.e. containing imaginary parts) over two coordinates from -inf to
+inf. I known that there is no analytical integral.
Another thing is, that sympy.integrate says for a very simple
expression containing imaginary I: sympy.c
I have a function that is not piecewise and cannot be symbolically
integrated. Hence, I cannot use the Riemann or trapezoid
approximations.
Is there any other way in Sage to numerically integrate such a
function?
Thanks,
Andrew
--~--~-~--~~~---~--~~
To post to th
Does anyone know how to *easily* do numerical integration on SAGE?
The problem is that when doing (say) arc length problems, if SAGE
doesn't know how to do the antiderivative, it doesn't default to some
sort of numerical role, and the only efficient way I have found to do
it so far is to convert t
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