Struct FisherInvFn 

pub struct FisherInvFn;

Returns the inverse Fisher transformation of y.

FISHERINV maps Fisher z-values back to the open interval (-1, 1).

Remarks

• The inverse form is (e^(2y) - 1) / (e^(2y) + 1).
• Output is always strictly between -1 and 1 for finite inputs.
• This function is useful for converting transformed correlation estimates back to r-space.
• Invalid numeric coercions propagate as spreadsheet errors.

Examples

title: "Inverse Fisher at zero"
formula: "=FISHERINV(0)"
expected: 0

title: "Round-trip with FISHER(0.5)"
formula: "=FISHERINV(0.5493061443340549)"
expected: 0.5

Trait Implementations

impl Debug for FisherInvFn

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

Formats the value using the given formatter.

impl Function for FisherInvFn

[formualizer-docgen:schema:start] Name: FISHERINV Type: FisherInvFn Min args: 1 Max args: 1 Variadic: false Signature: FISHERINV(arg1: number@range) Arg schema: arg1{kinds=number,required=true,shape=range,by_ref=false,coercion=NumberLenientText,max=None,repeating=None,default=false} Caps: PURE, NUMERIC_ONLY [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.