74 lines
2 KiB
Matlab
74 lines
2 KiB
Matlab
function x = Func(typ, n, p)
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%
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% Func - a class for functors.
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%
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% A functor is an object that behaves like a function. Cantera
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% defines a set of functors to use to create arbitrary functions to
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% specify things like heat fluxes, piston speeds, etc., in reactor
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% network simulations. Of course, they can be used for other things
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% too.
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%
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% The main feature of a functor class is that it overloads the '()'
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% operator to evaluate the function. For example, suppose object
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% 'f' is a functor that evaluates the polynomial '2x^2 - 3x +
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% 1'. Then writing 'f(2)' would cause the method that evaluates the
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% function to be invoked, and would pass it the argument '2'. The
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% return value would of course be 3.
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%
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% The types of functors you can create in Cantera are these:
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% 1. A polynomial
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% 2. A Fourier series
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% 3. A sum of Arrhenius terms
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% 4. A Gaussian.
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% You can also create composite functors by adding, multiplying, or
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% dividing these basic functors, or other composite functors.
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%
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% Note: this MATLAB class shadows the underlying C++ Cantera class
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% "Func1". See the Cantera C++ documentation for more details.
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%
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if ~isa(typ, 'char')
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error('Function type must be a string')
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end
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x.f1 = 0;
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x.f2 = 0;
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x.coeffs = 0;
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itype = -1;
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if strcmp(typ, 'polynomial')
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itype = 2;
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elseif strcmp(typ,'fourier')
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itype = 1;
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elseif strcmp(typ,'arrhenius')
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itype = 3;
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elseif strcmp(typ,'gaussian')
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itype = 4;
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end
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if itype > 0
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x.coeffs = p;
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x.index = funcmethods(0,itype,n,p);
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elseif strcmp(typ,'periodic')
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itype = 50;
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x.f1 = n;
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x.coeffs = p;
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x.index = funcmethods(0,itype,n.index,p);
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else
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if strcmp(typ,'sum')
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itype = 20;
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elseif strcmp(typ,'diff')
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itype = 25;
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elseif strcmp(typ,'prod')
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itype = 30;
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elseif strcmp(typ,'ratio')
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itype = 40;
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elseif strcmp(typ,'composite')
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itype = 60;
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end
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x.f1 = n;
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x.f2 = p;
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x.index = funcmethods(0,itype,n.index,p.index);
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end
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x.typ = typ;
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x = class(x,'Func');
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