Hello,
When I try:
var('t')
r=vector((t^2,5*t,t^2-16))
v=derivative(r(t),t)
norm_v=v.norm()
print r
print v
pos=r(0)
print pos
vel=v(0)
i receive an error for the last command vel(0)...i suppose i'm doing
something wrong ....
see error below
Thank you for help...
FG
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "_sage_input_33.py", line 14, in <module>
vel=v(_sage_const_0 )
File "", line 1, in <module>
File "free_module_element.pyx", line 2023, in
sage.modules.free_module_element.FreeModuleElement_generic_dense.__call__
(sage/modules/free_module_element.c:16913)
File "expression.pyx", line 2957, in
sage.symbolic.expression.Expression.__call__ (sage/symbolic/
expression.cpp:14483)
File "ring.pyx", line 564, in
sage.symbolic.ring.SymbolicRing._call_element_ (sage/symbolic/ring.cpp:
6007)
ValueError: the number of arguments must be less than or equal to 0
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