Support for functions of several variables

[bourdin]

Is there a way to implement user functions of more than one variable (or built-in functions of more than one variable)?
The example that immediately comes to mind would be atan2(x,y) used to convert from cartesian to polar coordinates.

[fluidnumerics-joe]

See this example . You need to declare multiple independent variables. When calling the evaluate function, you need to pass in a multidimensional array, where the length of the last dimension corresponds to the number of independent variables.

This being said, atan2 is a Fortran intrinsic...https://gcc.gnu.org/onlinedocs/gfortran/ATAN2.html

[bourdin]

Thanks, I had not paid enough attention to these examples.

I am confused about your statement about atan2 being a fortran intrinsic. As far as I can see, all functions implemented in FEQParse_Functions.f90 are functions of one variable. Is there an easy way to add support for primitives that are functions of more than one variables?
I would like to parse user input possibly involving atan2 (in order to express boundary conditions in polar coordinates emanating from a given origin in my fracture code https://github.com/bourdin/mef90)