What does ~ signify in: function [x, f, g] = defineSystem(~, params)

function [x, f, g] = defineSystem(~, params)

syms p v z % states

x = [p; v; z];

f0 = params.f0;

f1 = params.f1;

f2 = params.f2;

v0 = params.v0;

m = params.m;

Fr = f0 + f1 * v + f2 * v^2;

% Dynamics

f = [v; -Fr/m; v0-v];

g = [0; 1/m; 0];

end

Answer 1

[Torsten]

It signifies that the function "defineSystem" is usually called with two inputs, but that the first input can be ignored in the actual case because it is not needed to calculate the output variables x, f and g.

[Pallov Anand]

Ok, got it. Thanks