Separate test and example for Irisawa hexlet

Put shared code in the conditionally compiled `engine::irisawa` module.

app-proto/Cargo.toml

@@ -6,6 +6,7 @@ edition = "2021"
 
 [features]
 default = ["console_error_panic_hook"]
+irisawa = []
 
 [dependencies]
 itertools = "0.13.0"
@@ -36,7 +37,12 @@ features = [
   'WebGlVertexArrayObject'
 ]
 
+# the self-dependency specifies features to use for tests and examples
+#
+#   https://github.com/rust-lang/cargo/issues/2911#issuecomment-1483256987
+#
 [dev-dependencies]
+dyna3 = { path = ".", default-features = false, features = ["irisawa"] }
 wasm-bindgen-test = "0.3.34"
 
 [profile.release]

app-proto/examples/irisawa-hexlet.rs

@@ -0,0 +1,25 @@
+use dyna3::engine::{Q, irisawa::realize_irisawa_hexlet};
+
+fn main() {
+    const SCALED_TOL: f64 = 1.0e-12;
+    let (config, success, history) = realize_irisawa_hexlet(SCALED_TOL);
+    print!("\nCompleted Gram matrix:{}", config.tr_mul(&*Q) * &config);
+    if success {
+        println!("Target accuracy achieved!");
+    } else {
+        println!("Failed to reach target accuracy");
+    }
+    println!("Steps: {}", history.scaled_loss.len() - 1);
+    println!("Loss: {}", history.scaled_loss.last().unwrap());
+    if success {
+        println!("\nChain diameters:");
+        println!("  {} sun (given)", 1.0 / config[(3, 3)]);
+        for k in 4..9 {
+            println!("  {} sun", 1.0 / config[(3, k)]);
+        }
+    }
+    println!("\nStep │ Loss\n─────┼────────────────────────────────");
+    for (step, scaled_loss) in history.scaled_loss.into_iter().enumerate() {
+        println!("{:<4} │ {}", step, scaled_loss);
+    }
+}

app-proto/run-examples

@@ -4,5 +4,6 @@
 #   http://xion.io/post/code/rust-examples.html
 #
 
+cargo run --example irisawa-hexlet
 cargo run --example three-spheres
 cargo run --example point-on-sphere

app-proto/src/engine.rs

@@ -276,66 +276,21 @@ pub fn realize_gram(
 
 // --- tests ---
 
-#[cfg(test)]
+// this problem is from a sangaku by Irisawa Shintarō Hiroatsu. the article
-mod tests {
+// below includes a nice translation of the problem statement, which was
+// recorded in Uchida Itsumi's book _Kokon sankan_ (_Mathematics, Past and
+// Present_)
+//
+//   "Japan's 'Wasan' Mathematical Tradition", by Abe Haruki
+//   https://www.nippon.com/en/japan-topics/c12801/
+//
+#[cfg(feature = "irisawa")]
+pub mod irisawa {
     use std::{array, f64::consts::PI};
     
     use super::*;
     
-    #[test]
+    pub fn realize_irisawa_hexlet(scaled_tol: f64) -> (DMatrix<f64>, bool, DescentHistory) {
-    fn sub_proj_test() {
-        let target = PartialMatrix(vec![
-            MatrixEntry { index: (0, 0), value: 19.0 },
-            MatrixEntry { index: (0, 2), value: 39.0 },
-            MatrixEntry { index: (1, 1), value: 59.0 },
-            MatrixEntry { index: (1, 2), value: 69.0 }
-        ]);
-        let attempt = DMatrix::<f64>::from_row_slice(2, 3, &[
-            1.0, 2.0, 3.0,
-            4.0, 5.0, 6.0
-        ]);
-        let expected_result = DMatrix::<f64>::from_row_slice(2, 3, &[
-            18.0, 0.0, 36.0,
-            0.0, 54.0, 63.0
-        ]);
-        assert_eq!(target.sub_proj(&attempt), expected_result);
-    }
-    
-    #[test]
-    fn zero_loss_test() {
-        let gram = PartialMatrix({
-            let mut entries = Vec::<MatrixEntry>::new();
-            for j in 0..3 {
-                for k in 0..3 {
-                    entries.push(MatrixEntry {
-                        index: (j, k),
-                        value: if j == k { 1.0 } else { -1.0 }
-                    });
-                }
-            }
-            entries
-        });
-        let config = {
-            let a: f64 = 0.75_f64.sqrt();
-            DMatrix::from_columns(&[
-                sphere(1.0, 0.0, 0.0, a),
-                sphere(-0.5, a, 0.0, a),
-                sphere(-0.5, -a, 0.0, a)
-            ])
-        };
-        let state = SearchState::from_config(&gram, config);
-        assert!(state.loss.abs() < f64::EPSILON);
-    }
-    
-    // this problem is from a sangaku by Irisawa Shintarō Hiroatsu. the article
-    // below includes a nice translation of the problem statement, which was
-    // recorded in Uchida Itsumi's book _Kokon sankan_ (_Mathematics, Past and
-    // Present_)
-    //
-    //   "Japan's 'Wasan' Mathematical Tradition", by Abe Haruki
-    //   https://www.nippon.com/en/japan-topics/c12801/
-    //
-    fn realize_irisawa_hexlet(scaled_tol: f64) -> (DMatrix<f64>, bool, DescentHistory) {
         let gram = {
             let mut gram_to_be = PartialMatrix::new();
             for s in 0..9 {
@@ -388,12 +343,62 @@ mod tests {
             scaled_tol, 0.5, 0.9, 1.1, 200, 110
         )
     }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::{*, irisawa::realize_irisawa_hexlet};
+    
+    #[test]
+    fn sub_proj_test() {
+        let target = PartialMatrix(vec![
+            MatrixEntry { index: (0, 0), value: 19.0 },
+            MatrixEntry { index: (0, 2), value: 39.0 },
+            MatrixEntry { index: (1, 1), value: 59.0 },
+            MatrixEntry { index: (1, 2), value: 69.0 }
+        ]);
+        let attempt = DMatrix::<f64>::from_row_slice(2, 3, &[
+            1.0, 2.0, 3.0,
+            4.0, 5.0, 6.0
+        ]);
+        let expected_result = DMatrix::<f64>::from_row_slice(2, 3, &[
+            18.0, 0.0, 36.0,
+            0.0, 54.0, 63.0
+        ]);
+        assert_eq!(target.sub_proj(&attempt), expected_result);
+    }
+    
+    #[test]
+    fn zero_loss_test() {
+        let gram = PartialMatrix({
+            let mut entries = Vec::<MatrixEntry>::new();
+            for j in 0..3 {
+                for k in 0..3 {
+                    entries.push(MatrixEntry {
+                        index: (j, k),
+                        value: if j == k { 1.0 } else { -1.0 }
+                    });
+                }
+            }
+            entries
+        });
+        let config = {
+            let a: f64 = 0.75_f64.sqrt();
+            DMatrix::from_columns(&[
+                sphere(1.0, 0.0, 0.0, a),
+                sphere(-0.5, a, 0.0, a),
+                sphere(-0.5, -a, 0.0, a)
+            ])
+        };
+        let state = SearchState::from_config(&gram, config);
+        assert!(state.loss.abs() < f64::EPSILON);
+    }
     
     #[test]
     fn irisawa_hexlet_test() {
         // solve Irisawa's problem
         const SCALED_TOL: f64 = 1.0e-12;
-        let (config, success, history) = realize_irisawa_hexlet(SCALED_TOL);
+        let (config, _, _) = realize_irisawa_hexlet(SCALED_TOL);
         
         // check against Irisawa's solution
         let entry_tol = SCALED_TOL.sqrt();
@@ -401,26 +406,5 @@ mod tests {
         for (k, diam) in solution_diams.into_iter().enumerate() {
             assert!((config[(3, k)] - 1.0 / diam).abs() < entry_tol);
         }
-        
-        // print info
-        print!("\nCompleted Gram matrix:{}", config.tr_mul(&*Q) * &config);
-        if success {
-            println!("Target accuracy achieved!");
-        } else {
-            println!("Failed to reach target accuracy");
-        }
-        println!("Steps: {}", history.scaled_loss.len() - 1);
-        println!("Loss: {}", history.scaled_loss.last().unwrap());
-        if success {
-            println!("\nChain diameters:");
-            println!("  {} sun (given)", 1.0 / config[(3, 3)]);
-            for k in 4..9 {
-                println!("  {} sun", 1.0 / config[(3, k)]);
-            }
-        }
-        println!("\nStep │ Loss\n─────┼────────────────────────────────");
-        for (step, scaled_loss) in history.scaled_loss.into_iter().enumerate() {
-            println!("{:<4} │ {}", step, scaled_loss);
-        }
     }
 }