In Chapter 3, we saw how to "build" mathematical functions directly via the Octave command prompt. Here we will do the same thing, but we will do it properly this time and use Octave functions.

Consider the following vector valued function which we will call the Sel'kov function (an explanation follows later):

*b* is some positive real number that we can vary as we like. We can write Equation (5.1) in a slightly different way by letting (*x*,*y*)=(*x*_{1},*x*_{2})=**x**:

When we write an Octave function for Equation ...

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