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I am trying to plot the phase plane.
The code gives the error :Undefined function or variable 'ciplot'.
Error in phaseplane1 (line 6)
ciplot(lower, upper, x, 'b')
I tried to define ciplot as a function by using the code:
function ciplot(lower,upper,x,colour);
if nargin<4
colour='b';
end
if nargin<3
x=0:0.01:2;
end
But it still doesn't work.

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