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make newtons_method more accurate

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This commit is contained in:
Simon Gardling 2022-03-10 14:13:57 -05:00
parent 9935285c98
commit c692c7c3a2
1 changed files with 4 additions and 3 deletions
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7
src/function.rs
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@ -306,7 +306,8 @@ impl FunctionEntry {
self.min_x = min_x; self.min_x = min_x;
self.max_x = max_x; self.max_x = max_x;
let resolution: f64 = (self.pixel_width as f64 / (self.max_x - self.min_x).abs()) as f64; let threshold: f64 =
((self.pixel_width as f64 / (self.max_x - self.min_x).abs()) as f64) / 2.0;
let (back_values, integral, derivative) = self.run_back(); let (back_values, integral, derivative) = self.run_back();
self.output.back = Some(back_values); self.output.back = Some(back_values);
@ -317,7 +318,7 @@ impl FunctionEntry {
if do_extrema { if do_extrema {
self.output.extrema = Some( self.output.extrema = Some(
newtons_method( newtons_method(
resolution, threshold,
self.min_x..self.max_x, self.min_x..self.max_x,
self.output.derivative.to_owned().unwrap(), self.output.derivative.to_owned().unwrap(),
&|x: f64| self.function.get_derivative_1(x), &|x: f64| self.function.get_derivative_1(x),
@ -333,7 +334,7 @@ impl FunctionEntry {
if do_roots { if do_roots {
self.output.roots = Some( self.output.roots = Some(
newtons_method( newtons_method(
resolution, threshold,
self.min_x..self.max_x, self.min_x..self.max_x,
self.output.back.to_owned().unwrap(), self.output.back.to_owned().unwrap(),
&|x: f64| self.function.get(x), &|x: f64| self.function.get(x),