add pure measurement error channel

src/main.rs

@@ -77,7 +77,16 @@ fn main() {
         .parse::<usize>()
         .unwrap();
 
-    let (m_correct, m_error) = load_channel_coeffs_from_file(matches.value_of("channel").unwrap());
+    let channel = matches.value_of("channel").unwrap();
+    let (m_correct, m_error) = if let Ok(pm) = channel.parse::<f64>() {
+        let mut m_correct = vec![0.; 256];
+        m_correct[0] = 1. - pm;
+        let mut m_error = vec![0.; 256];
+        m_error[0] = pm;
+        (m_correct, m_error)
+    } else {
+        load_channel_coeffs_from_file(channel)
+    };
 
     // let pm = 0.02;
     // let mut m_correct = vec![0.; 256];