// catenary.fe
// String of fixed length hanging between supports, 
// minimizing gravitational energy.

space_dimension 2
string

quantity grav energy method edge_scalar_integral global
scalar_integrand: y

quantity arclength fixed = 3 method edge_length global

vertices
1   -1 1 fixed
2    0 0 
3    1 1 fixed

edges
1    1 2 tension 0
2    2 3 tension 0