r is resistance it 's a RC circuit.
I got this from arachnoid :
http://arachnoid.com/sage/differential1.html
But while trying to make it work I probably mess it ! sorry !
Nothing to do with r ...
I will remake it in a proper way jupyter notebook, sorry for the
disturbance :)
Henri
Le 05/02/2017 à 10:32, Dima Pasechnik a écrit :
On Sunday, February 5, 2017 at 12:27:51 AM UTC, HG wrote:
Hi,
I can't find where are the mistakes ?
It says it's about floating ... It representes two waves
Any help ?
Best
Henri
var("ct omega t")
y = function("y")(t)
de = y + r*ct*diff(y,t) == sin(omega * t)
what is the meaning of r in this line? Is it a constant?
Loading this in sage results in
TypeError: For implementing multiplication, provide the method '_mul_'
for R Interpreter resp. ct
(that is it assumes that 'r' stands for R interface...)
des = desolve(de,[y,t]);des
des2 = (des.substitute(ct == 0.1)).full_simplify()
df(r,ct,omega,t) = des2
r = 1000
c = 0.5e-6
f = 440
omega = 2*pi*f
pa =
plot(sin(omega*t),(t,0,.005),rgbcolor=('#800000'),axes_labels=['time','v'])
pb = plot(df(r,c,omega,t),(t,0,.005),rgbcolor=('#008000'))
lbl = text("$f = %.0f Hz \,r = %.0f \Omega \, c = %.1f {\mu}f$"
% (f,r,c*1e6),(.0025,1.2),fontsize=12,rgbcolor='black')
show(pa+pb+lbl,figsize=(4,3))
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