fix linear indexing of matrix slices

src/base/indexing.rs

@@ -567,7 +567,10 @@ where
     #[doc(hidden)]
     #[inline(always)]
     unsafe fn get_unchecked(self, matrix: &'a Matrix<T, R, C, S>) -> Self::Output {
-        matrix.data.get_unchecked_linear(self)
+        let nrows = matrix.shape().0;
+        let row = self % nrows;
+        let col = self / nrows;
+        matrix.data.get_unchecked(row, col)
     }
 }
 

src/base/matrix_slice.rs

@@ -73,7 +73,6 @@ macro_rules! slice_storage_impl(
                       S: $Storage<T, RStor, CStor>,
                       RStride: Dim,
                       CStride: Dim {
-
                 $T::from_raw_parts(storage.$get_addr(start.0, start.1), shape, strides)
             }
         }