Arg stands for radian of complex number mathematically, which is the abbreviation of argument of complex number. For example:

z = r*(cosθ + i sinθ)

R is the modulus of z, that is, r = | z |

θ is the radial angle of z, which is denoted as θ = arg(z).

The radial angle of any non-zero complex number z=a+bi has an infinite number of values, which are different by integer multiples of 2π. Applicable to-π

Extended data:

The function argmax is a function for finding parameters (sets) of a function. When there is another function y=f(x), if there is a result x0= argmax(f(x)), it means that when the function f(x) takes x=x0, the maximum value of the range of f(x) is obtained; If there are multiple points that make f(x) get the same maximum, then the result of argmax(f(x)) is a point set. In other words, argmax(f(x)) is the variable point x (or the set of x) corresponding to the maximum value of f(x).

The formula of argmax is as follows:

For function f(x) or mapping f: x → y, when the value range of x is s (also called x∈S), the result of argmax is the x-point set that makes f(x) take the maximum value. Therefore, if x∈S is explicitly pointed out, it means that the maximum result value search is not carried out within all input variables of f(x).

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