Add methods .rows() .columns()

Author: bluss

src/impl_linalg.rs

@@ -140,6 +140,11 @@ impl<A, S> ArrayBase<S, (Ix, Ix)>
         self.subview_mut(Axis(0), index)
     }
 
+    /// Return the number of rows (length of `Axis(0)`) in the two-dimensional array.
+    pub fn rows(&self) -> Ix {
+        self.shape().axis(Axis(0))
+    }
+
     /// Return an array view of column `index`.
     ///
     /// **Panics** if `index` is out of bounds.
@@ -157,6 +162,11 @@ impl<A, S> ArrayBase<S, (Ix, Ix)>
         self.subview_mut(Axis(1), index)
     }
 
+    /// Return the number of columns (length of `Axis(1)`) in the two-dimensional array.
+    pub fn columns(&self) -> Ix {
+        self.shape().axis(Axis(1))
+    }
+
     /// Perform matrix multiplication of rectangular arrays `self` and `rhs`.
     ///
     /// The array shapes must agree in the way that