Struct ImLnFn 

pub struct ImLnFn;

Returns the natural logarithm of a complex number.

Produces the principal complex logarithm as text.

Remarks

• Input is coerced to complex-number text before parsing.
• Returns #NUM! for zero input because ln(0) is undefined.
• Invalid complex text returns #NUM!.

Examples

title: "Natural log of 1"
formula: "=IMLN(\"1\")"
expected: "0"

title: "Natural log on imaginary axis"
formula: "=IMLN(\"i\")"
expected: "1.5707963267948966i"

related:
  - IMEXP
  - IMLOG10
  - IMLOG2
faq:
  - q: "Why does `IMLN(0)` return `#NUM!`?"
    a: "The complex logarithm at zero is undefined, so this implementation returns `#NUM!`."

Trait Implementations

impl Debug for ImLnFn

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Function for ImLnFn

[formualizer-docgen:schema:start] Name: IMLN Type: ImLnFn Min args: 1 Max args: 1 Variadic: false Signature: IMLN(arg1: any@scalar) Arg schema: arg1{kinds=any,required=true,shape=scalar,by_ref=false,coercion=None,max=None,repeating=None,default=false} Caps: PURE [formualizer-docgen:schema:end]

fn caps(&self) -> FnCaps

Capability flags for this function

fn name(&self) -> &'static str

fn min_args(&self) -> usize

fn arg_schema(&self) -> &'static [ArgSchema]

fn eval<'a, 'b, 'c>( &self, args: &'c [ArgumentHandle<'a, 'b>], _ctx: &dyn FunctionContext<'b>, ) -> Result<CalcValue<'b>, ExcelError>

The unified evaluation path.

fn namespace(&self) -> &'static str

fn variadic(&self) -> bool

fn volatile(&self) -> bool

fn aliases(&self) -> &'static [&'static str]

Optional list of additional alias names (case-insensitive) that should resolve to this function. Default: empty slice. Implementors can override to expose legacy names. Returned slice must have ’static lifetime (typically a static array reference).

fn function_salt(&self) -> u64

fn eval_reference<'a, 'b, 'c>( &self, _args: &'c [ArgumentHandle<'a, 'b>], _ctx: &dyn FunctionContext<'b>, ) -> Option<Result<ReferenceType, ExcelError>>

Optional reference result path. Only called by the interpreter/engine when the callsite expects a reference (e.g., range combinators, by-ref argument positions, or spill sources).

fn dispatch<'a, 'b, 'c>( &self, args: &'c [ArgumentHandle<'a, 'b>], ctx: &dyn FunctionContext<'b>, ) -> Result<CalcValue<'b>, ExcelError>

Dispatch to the unified evaluation path with automatic argument validation.