Hi,
I got this example from here :
http://arachnoid.com/sage/differential1.html
For many years it was working, I use now sage 7.6 or sage 8 but I go the
same error it can get the variable t, as I know it's working, any help ?
# r = 1000 ohms, c = 0.5e-6 farads, f = 440
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))
error :
..... I cut here as it is too large.... Only the end.
/home/pi/sage/src/sage/ext/fast_callable.pyx in
sage.ext.fast_callable.ExpressionTreeBuilder.var
(/home/pi/sage/src/build/cythonized/sage/ext/fast_callable.c:6657)() 696
ind = self._vars.index(var_name) 697 except ValueError:-->
698 raise ValueError("Variable '%s' not found" % var_name) 699
return ExpressionVariable(self, ind) 700
ValueError: Variable 't' not found
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