Heads up on modelx v0.15.0

[fumitoh]

Dependency tracing is one of the most useful features of modelx. The next version of modelx will introduce a major enhancement in the tracing feature.

Currently the preds method of a Cells lists other Cells that the Cells depends on when calculating its value.
Here's a sample script for illustration.

import modelx as mx

space = mx.new_space()
space.new_space('Child')
space.Child.new_space('GrandChild')

space.x = 1
space.Child.y = 2
space.Child.GrandChild.z = 3

@mx.defcells(space=space)
def foo(t):
    return t

@mx.defcells(space=space)
def bar(t):
    return foo(t) + x + Child.y + Child.GrandChild.z

The bar Cells depends on one Cells foo, and 3 References, x, Child.y , and Child.GrandChild.z.
Below, bar.preds(3) returns a list containing foo(3), which is the only Cells element that bar(3) depends on.

>>> bar(3)
9

>>> bar.preds(3)
[Model1.Space1.foo(t=3)=3]

v0.15.0, the next version of modelx, will introduce the precedents method. The method returns a list containing not only Cells elements, but also References that the Cells depends on when calculating its value:

>>> bar.precedents(3)
[Model1.Space1.foo(t=3)=3,
 Model1.Space1.x=1,
 Model1.Space1.Child.GrandChild.z=3,
 Model1.Space1.Child.y=2]

Accordingly, spyder-modelx will be updated to show the Reference elements in MxAnalyzer.