fumitoh
How to make dynamic space cross-referencing each other?
How to make dynamic space cross-referencing each other? I've tried the following and it doesn't work:
from modelx import *
m = new_model()
def try_param_x(a):
return {'refs': {'y': y_base(a), 'bases': _self}}
m.new_space(name='x', formula=try_param_x)
def try_param_y(a):
return {'refs': {'x': x_base(a), 'bases': _self}}
m.new_space(name='y', formula=try_param_y, refs={'x_base': m.x})
m.x.y_base = m.y
m.x(1)
This is a good question actually, and I don't think its possible at the moment.
from modelx import *
m = new_model()
def try_param_x(a):
return {'refs': {'y': y_base(a)}} # No 'bases' key means Space x is the base space of x[a] for any a.
m.new_space(name='x', formula=try_param_x)
def try_param_y(a):
return {'refs': {'x': x_base(a)}}
m.new_space(name='y', formula=try_param_y)
m.x.y_base = m.y # `y_base` in m.x.formula refers to m.y
m.y.x_base = m.x # `x_base` in m.y.formula refers to m.x
m.x(1) # => Python crashes
Python crashes because of a circular reference::
m.x(1) calls m.x.formula(1),
which calls m.y(1) through y_base(1),
which in turn calls m.y.formula(1),
which calls m.x(1) through x_base(1) -> back to start
An ugly workaround is to define
y in m.x.formula as m.y and
x in m.y.formula as m.x, and refer to dynamic spaces in cells formulas with their parameters,
such as y[a] or x[a].
I was not aware of this cross-reference use case, but there might be some use cases in ALM contexts. I will take a look if this circular reference can be avoided after finishing some enhancements I'm currently working on.
