Today I explore argmax and argmin function defined in Base package.
armax returns a maximal index, while argmin returns a minimal index.
A = [1 2; 3 4]
argmax(A)
Output:
CartesianIndex(2, 2)
B=[-1 2; 10 -10]
argmax(B)
Output:
CartesianIndex(2, 1)
argmin(B)
Output:
CartesianIndex(2, 2)
argmax can have a function as the first argument (say f) and the domain of the function (say x) as the second argument and it will still find a value of x that maximizes f(x) .
plot(x->x^2-3*x, -10:10)
Output:
argmax(x->x^2-3*x,-10:10 )
argmin(x->x^2-3*x,-10:10 )
Output:
-10
1