More progress.

src/fitter/recursive.rs

@@ -0,0 +1,43 @@
+use crate::kernel::Kernel;
+
+use super::Fitter;
+
+pub struct RecursiveFitter {
+    ts_new: Vec<f64>,
+    kernel: Box<dyn Kernel>,
+    ts: Vec<usize>,
+    ms: Vec<usize>,
+    vs: Vec<usize>,
+    ns: Vec<usize>,
+    xs: Vec<usize>,
+    is_fitted: bool,
+}
+
+impl RecursiveFitter {
+    pub fn new(kernel: Box<dyn Kernel>) -> Self {
+        RecursiveFitter {
+            ts_new: Vec::new(),
+            kernel,
+            ts: Vec::new(),
+            ms: Vec::new(),
+            vs: Vec::new(),
+            ns: Vec::new(),
+            xs: Vec::new(),
+            is_fitted: true,
+        }
+    }
+}
+
+impl Fitter for RecursiveFitter {
+    fn add_sample(&mut self, t: f64) -> usize {
+        todo!();
+    }
+
+    fn allocate(&mut self) {
+        todo!();
+    }
+
+    fn fit(&mut self) {
+        todo!();
+    }
+}