Make two_level trait impl more readable

Also fix a little non-returning result issue

2 files changed, 3 insertions, 4 deletions

diff --git a/src/plot/gnuplot.rs b/src/plot/gnuplot.rs
index 8bb5ac6..fec64b7 100644
--- a/src/plot/gnuplot.rs
+++ b/src/plot/gnuplot.rs
@@ -29,6 +29,7 @@ fn write_data_file(path: &str, data: &[[f64; 6]]) -> Result<(), io::Error> {
             line[0], line[1], line[2], line[3], line[4], line[5]
         ))?;
     }
+    Ok(())
 }
 
 impl Gnuplot {
diff --git a/src/simulation/two_level.rs b/src/simulation/two_level.rs
index 99336a5..2d9d459 100644
--- a/src/simulation/two_level.rs
+++ b/src/simulation/two_level.rs
@@ -16,10 +16,8 @@ impl TwoLevel {
 
 impl State for TwoLevel {
     fn fibrate(&self) -> Vec<f64> {
-        self.state
-            .iter()
-            .flat_map(|c| [c.re, c.im])
-            .map(|v| *v)
+        self.state.iter()
+            .flat_map(|c| std::iter::once(c.re).chain(std::iter::once(c.im)))
             .collect()
     }