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<4colour='b';endif nargin<3 x=0:0.01:2;end
But it still doesn't work.
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