Define a function in Calc (Embedded)

Question

In Calc Embedded Mode, you can define a variable with the := operator. You can then use it in an equation using the => operator and it will be automatically updated when you change the variable. See (calc) Assignments in Embedded Mode.

Example:

• Create a new buffer containing:

x := 3

x + 2 => 9999

• Invoke calc-embedded-activate (C-x * a)

• Invoke calc-embedded-update-formula (C-x * u) on the bottom equation. It changes to x + 2 => 5

• Now enter embedded mode on the top equation and change it to x := 30. The bottom one will change to x + 2 => 32.

But this doesn't work with functions. Create a buffer containing

f(x) := 2 x

f(2) => 9999

Invoke C-x * a anywhere and invoke C-x * u on the bottom equation. It changes to f(2) => f(2). Changing the top equation doesn't affect the bottom one.

Is there any way to define a function from within Calc or does it have another way of dealing with this? I know of defmath but that doesn't help in e.g. a Latex document (unless you define the function twice, likely making mistakes).

Answer 1

This probably won't be very satisfying but you can use the anonymous function syntax and call the function with the call function:

f := <x : 2 x>

call(f, 7) => 14

(Sadly f(7) doesn't work.)