I use the nyquist command and I get the nyquist plot with the arrow going from low frequency to high frequecny. I'd like to have the arrow point the other way, instead.
Arrow on Nyquist plot
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Assuming a rational transfer function with real coefficients, then this can be done by inputting the complex conjugate of the original transfer function. This can be achieved by multiply each coefficient of odd powers of s by minus one. So for example:
>> figure, nyquist(tf([1 1],[1 1 2 0]))
>> figure, nyquist(tf([-1 1],[-1 1 -2 0]))
yields the same plots, but with the arrows pointing in the opposite direction.