Undefined variable or function 'v'.

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Nathan Zanetto
Nathan Zanetto 2015-10-7
回答： Adam 2015-10-7
I am trying to solve the following second order differential equation;
y'' = (-1/(RC))*y'-(1/(LC))*y
my function is as follows,
function dv = second_order_circuit(t,v)
R = 30;
C = 0.2;
L = 0.8;
dv(1) = v(2);
dv(2) = (-1/(R*C))*dv(1)-(-1/(L*C))*v(2);
end
I cannot figure out why I have the error
Undefined variable or function 'v'
Any help will be greatly appreciated, including what I will need in my command window to plot this over a 20 second period with and initial v(0) = 20 volts.
  1 个评论
Nathan Zanetto
Nathan Zanetto 2015-10-7
A simple restart of MatLab has solved the undefined variable issue, I am unable to produce anything though. What do I need in the command window? Thanks.

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回答（1 个）

Adam
Adam 2015-10-7
t = 1:10;
v = 17;
dv = second_order_circuit(t,v);
is an example of what you need on command line, although I have no idea what t and v are in terms of scalar, vector, 2d array, big numbers, small numbers, etc.

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