add isvariable for Nums

isaacsas · isaacsas · commit 9b827364ac94 · 2021-10-08T13:06:03.000-04:00
diff --git a/src/utils.jl b/src/utils.jl
@@ -225,6 +225,7 @@ isdiffeq(eq) = isdifferential(eq.lhs)
 isdifference(expr) = istree(expr) && operation(expr) isa Difference
 isdifferenceeq(eq) = isdifference(eq.lhs)
 
+isvariable(x::Num) = isvariable(value(x))
 function isvariable(x)
     x isa Symbolic || return false
     p = getparent(x, nothing)
