6822505602
Uses statrs for numerical functions REFACTOR: Put statistical functions on its own module This might seem counter-intuitive but the wasm build after this refactor is 1528 bytes smaller :)
22 lines
702 B
Rust
22 lines
702 B
Rust
use crate::expressions::types::CellReferenceIndex;
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use crate::{calc_result::CalcResult, expressions::parser::Node, model::Model};
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impl Model {
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// PHI(x) = standard normal PDF at x
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pub(crate) fn fn_phi(&mut self, args: &[Node], cell: CellReferenceIndex) -> CalcResult {
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if args.len() != 1 {
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return CalcResult::new_args_number_error(cell);
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}
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let x = match self.get_number_no_bools(&args[0], cell) {
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Ok(f) => f,
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Err(e) => return e,
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};
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// Standard normal PDF: (1 / sqrt(2π)) * exp(-x^2 / 2)
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let result = (-(x * x) / 2.0).exp() / (2.0 * std::f64::consts::PI).sqrt();
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CalcResult::Number(result)
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}
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}
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