The causes command gives no output

[ToddFincannon]

For example, in the sum.mdl sample model, the variable c depends on a, but sde causes does not show any dependencies at all.

> sde causes models/sum/sum _c
# no output

[ToddFincannon]

The sde causes command needed the model directory set like other commands. This avoids a fatal error. The command above now prints correct output.

_c
  _a[_a1]
  _a[_a2]
  _a[_a3]