Struct SeriesSumFn 

pub struct SeriesSumFn;

Trait Implementations

impl Debug for SeriesSumFn

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

Formats the value using the given formatter.

impl Function for SeriesSumFn

Evaluates a power series from coefficients, start power, and step.

Remarks

• Computes sum(c_i * x^(n + i*m)) in coefficient order.
• Coefficients may be supplied as a scalar, array literal, or range.
• Errors in x, n, m, or coefficient values are propagated.

Examples

title: "Series from an array literal"
formula: "=SERIESSUM(2,0,1,{1,2,3})"
expected: 17

title: "Series from worksheet coefficients"
grid:
  A1: 1
  A2: -1
  A3: 0.5
formula: "=SERIESSUM(0.5,1,2,A1:A3)"
expected: 0.390625

related:
  - SUMPRODUCT
  - POWER
  - EXP
faq:
  - q: "In what order are SERIESSUM coefficients applied?"
    a: "Coefficients are consumed in input order as c_i*x^(n+i*m)."

[formualizer-docgen:schema:start] Name: SERIESSUM Type: SeriesSumFn Min args: 4 Max args: 4 Variadic: false Signature: SERIESSUM(arg1: number@scalar, arg2: number@scalar, arg3: number@scalar, arg4: any@scalar) Arg schema: arg1{kinds=number,required=true,shape=scalar,by_ref=false,coercion=NumberLenientText,max=None,repeating=None,default=false}; arg2{kinds=number,required=true,shape=scalar,by_ref=false,coercion=NumberLenientText,max=None,repeating=None,default=false}; arg3{kinds=number,required=true,shape=scalar,by_ref=false,coercion=NumberLenientText,max=None,repeating=None,default=false}; arg4{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.