User-defined functions

A function has zero or one named output. Definitions are registered before script execution, so a call may precede its declaration.

answer = square(5);

function result = square(value)
    result = value * value;
end

• Calls receive only positional parameters as local variables.
• Matrix arguments are passed by value.
• A user function can shadow a built-in.
• A same-named matrix variable takes precedence and is indexed.
• Recursion is limited to 32 simultaneous calls.

Nested functions, closures, anonymous functions, multiple outputs, optional arguments, and automatic function-file lookup are not implemented. Native compilation rejects user functions with interpreter guidance.