Function symbol Ruby Wrappers

[rajithv]

Wrappers for the function symbol class

[abinashmeher999]

The function shouldn't print anything.

[isuruf]

No need of these extra lines

[isuruf]

Python wrappers have a nice syntax for creating FunctionSymbols.

func = Function('f')
Above would create an UndefFunction object which is a Python class, and
func(x, 2*y) would create a FunctionSymbol f(x, 2*y).

What do you think?

[rajithv]

@isuruf What are the advantages of doing it in two steps?

What about, haveing SymEngine::Function('f', x, 2*y) as an alias for SymEngine::FunctionSymbol.new(...) ?

[isuruf]

Remove this. Differentiation should throw an error if the input is not a Symbol.

[isuruf]

Advantage is for easy typing when there are multiple function symbols made and also for readability

f = Function('f')
g = f(x, y) - 2 * f(y - x, x)

instead of

g = FunctionSymbol.new("f", x, y) - 2 * FunctionSymbol.new("f", y - x, x)

[isuruf]

You can move this inside class << self block and then you can remove SymEngine.