document transformation

tpapp · Jun 18, 2024 · 1a8149f · 1a8149f
1 parent f0066e9
commit 1a8149f
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/src/generic_api.jl b/src/generic_api.jl
@@ -275,8 +275,15 @@ end
 
 Base.parent(basis::TransformedBasis) = basis.parent
 
+"""
+$(SIGNATURES)
+
+Return the transformation of transformed bases, or `nothing` it not applicable.
+"""
 transformation(basis::TransformedBasis) = basis.transformation
 
+transformation(::FunctionBasis) = nothing
+
 domain(basis::TransformedBasis) = domain(basis.transformation)
 
 dimension(basis::TransformedBasis) = dimension(basis.parent)