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Improved accuracy for derivation

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bakk 2021-05-17 21:27:11 +02:00
parent 7a56322e0f
commit ece50bf92c
1 changed files with 2 additions and 2 deletions
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4
kalk/src/calculus.rs
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@ -14,7 +14,7 @@ pub fn derive_func(
const H: f64 = 0.000001; const H: f64 = 0.000001;
let unit = &argument.unit.to_string(); let unit = &argument.unit.to_string();
let argument_with_h = Expr::Literal(argument.clone().add(context, H.into()).to_f64()); let argument_with_h = Expr::Literal(argument.clone().add(context, H.into()).to_f64());
let argument_without_h = Expr::Literal(argument.to_f64()); let argument_without_h = Expr::Literal(argument.sub(context, H.into()).to_f64());
let f_x_h = interpreter::eval_fn_call_expr( let f_x_h = interpreter::eval_fn_call_expr(
context, context,
@ -29,7 +29,7 @@ pub fn derive_func(
unit, unit,
)?; )?;
Ok(f_x_h.sub(context, f_x).div(context, H.into())) Ok(f_x_h.sub(context, f_x).div(context, (2f64 * H).into()))
} }
pub fn integrate( pub fn integrate(