The API Function.draw() methods could be simplified

[mbaudin47]

What happened?

In this issue, I consider the Function.draw() method. This method has many input arguments, but some of them could be simplified or reduced.

• The current API requires xMin and xMax to draw the function. But this could be specified as an Interval.
• The current API requires an outputMarginalIndex. This is useless in practice, since we can use function.getMarginal(outputMarginalIndex).draw(), which is more simple. In this case, the API could remove the outputMarginalIndex input argument and generate an exception if the function has multiple outputs.
• The centralPoint could be removed because the user can define a ParametricFunction before calling the draw() method.

How to reproduce the issue?

The current implementation requires:

import openturns as ot
from openturns.viewer import View
f = ot.SymbolicFunction('x', 'sin(2*pi_*x)*exp(-x^2/2)')
graph = f.draw(-1.2, 1.2, 100)

This should be:

import openturns as ot
from openturns.viewer import View
f = ot.SymbolicFunction('x', 'sin(2*pi_*x)*exp(-x^2/2)')
interval = ot.Interval([-1.2], [1.2])
graph = f.draw(interval, 100)

Version

1.22

Operating System

unknown

Installation media

unknown

Additional Context

No response