The Emacs mode allows the user to edit an existing function by pressing C-c
C-f, or typing ∇ followed by the name of the function. This opens up the
function editor in a separate window.
However, when the user creates a function using the dfn notation:
avg ← {(+/⍵)÷⍴⍵}
And then tried to edit it using ∇avg, the Emacs mode will run the
equivalent of ⎕CR 'avg' behind the scenes, and present the following in the
function editor:
∇λ←avg ⍵
λ←(+/⍵)÷⍴⍵
This will of course fail when the user tries to save the function.
First a question for Jürgen:
*Can I rely on the fact that if the first character in a function
definition is **λ**, does that guarantee that the function is a dfn?* A
consequence of this is, for example, that I am guaranteed that the function
consists of only one statement.
So, I have a few options here and I would like people's input on it:
- I can simply pop up an error message if an attempt is made to edit a
lambda function (then how should they be edited?)
- I open the function editor in a special "lambda mode", limiting the
function to a single statement
- I replace λ, ⍺ and ⍵ with proper variables, thus converting the lambda
function into a normal function when saving.
- Jürgen allows the use of λ, ⍺ and ⍵ as variables in normal functions
so they behave just like any other function, except with unusual parameter
names.
*What solution do you think should be used?* The current state is really
not ideal.
Regards,
Elias
