diff --git a/examples/helloworld.rs b/examples/helloworld.rs
index 190cb5162..6ed726019 100644
--- a/examples/helloworld.rs
+++ b/examples/helloworld.rs
@@ -71,6 +71,12 @@ fn main() {
     print(&row(&a, num_rows - 1).unwrap());
     print(&col(&a, num_cols - 1).unwrap());
 
+    println!("Set last row to 1's");
+    let r_dims = Dim4::new(&[3, 1, 1, 1]);
+    let r_input: [f32; 3] = [1.0, 1.0, 1.0];
+    let r = Array::new(r_dims, &r_input, Aftype::F32).unwrap();
+    print(&set_row(&a, &r, num_rows - 1).unwrap());
+
     println!("Create 2-by-3 matrix from host data");
     let d_dims = Dim4::new(&[2, 3, 1, 1]);
     let d_input: [i32; 6] = [1, 2, 3, 4, 5, 6];
diff --git a/src/index.rs b/src/index.rs
index 003ca3689..93bdf82e3 100644
--- a/src/index.rs
+++ b/src/index.rs
@@ -114,26 +114,81 @@ pub fn index(input: &Array, seqs: &[Seq]) -> Result<Array, AfError> {
     }
 }
 
+#[allow(dead_code)]
 pub fn row(input: &Array, row_num: u64) -> Result<Array, AfError> {
-    let dims_err = input.dims();
-    let dims = match dims_err {
-        Ok(dim) =>  dim.clone(),
-        Err(e)  =>  panic!("Error unwrapping dims in row(): {}", e),
-    };
-
     index(input, &[Seq::new(row_num as f64, row_num as f64, 1.0)
-                    ,Seq::new(0.0, dims[1] as f64 - 1.0, 1.0)])
+                    , Seq::default()])
+}
+
+#[allow(dead_code)]
+pub fn set_row(input: &Array, new_row: &Array, row_num: u64) -> Result<Array, AfError> {
+    assign_seq(input, &[Seq::new(row_num as f64, row_num as f64, 1.0), Seq::default()]
+               , new_row)
+}
+
+#[allow(dead_code)]
+pub fn rows(input: &Array, first: u64, last: u64) -> Result<Array, AfError> {
+    index(input, &[Seq::new(first as f64, last as f64, 1.0), Seq::default()])
 }
 
+#[allow(dead_code)]
+pub fn set_rows(input: &Array, new_rows: &Array, first: u64, last: u64) -> Result<Array, AfError> {
+    assign_seq(input, &[Seq::new(first as f64, last as f64, 1.0), Seq::default()]
+               , new_rows)
+}
+
+#[allow(dead_code)]
 pub fn col(input: &Array, col_num: u64) -> Result<Array, AfError> {
-    let dims_err = input.dims();
-    let dims = match dims_err {
-        Ok(dim) =>  dim.clone(),
-        Err(e)  =>  panic!("Error unwrapping dims in row(): {}", e),
-    };
+    index(input, &[Seq::default()
+                    , Seq::new(col_num as f64, col_num as f64, 1.0)])
+}
+
+#[allow(dead_code)]
+pub fn set_col(input: &Array, new_col: &Array, col_num: u64) -> Result<Array, AfError> {
+    assign_seq(input, &[Seq::default(), Seq::new(col_num as f64, col_num as f64, 1.0)]
+               , new_col)
+}
 
-    index(input, &[Seq::new(0.0, dims[0] as f64 - 1.0, 1.0)
-                    ,Seq::new(col_num as f64, col_num as f64, 1.0)])
+#[allow(dead_code)]
+pub fn cols(input: &Array, first: u64, last: u64) -> Result<Array, AfError> {
+    index(input, &[Seq::default()
+                    , Seq::new(first as f64, last as f64, 1.0)])
+}
+
+#[allow(dead_code)]
+pub fn set_cols(input: &Array, new_cols: &Array, first: u64, last: u64) -> Result<Array, AfError> {
+    assign_seq(input, &[Seq::default(), Seq::new(first as f64, last as f64, 1.0)]
+               , new_cols)
+}
+
+#[allow(dead_code)]
+pub fn slice(input: &Array, slice_num: u64) -> Result<Array, AfError> {
+    index(input, &[Seq::default()
+                    , Seq::default()
+                    , Seq::new(slice_num as f64, slice_num as f64, 1.0)])
+}
+
+#[allow(dead_code)]
+pub fn set_slice(input: &Array, new_slice: &Array, slice_num: u64) -> Result<Array, AfError> {
+    assign_seq(input, &[Seq::default()
+                        , Seq::default()
+                        , Seq::new(slice_num as f64, slice_num as f64, 1.0)]
+               , new_slice)
+}
+
+#[allow(dead_code)]
+pub fn slices(input: &Array, first: u64, last: u64) -> Result<Array, AfError> {
+    index(input, &[Seq::default()
+                    , Seq::default()
+                    , Seq::new(first as f64, last as f64, 1.0)])
+}
+
+#[allow(dead_code)]
+pub fn set_slices(input: &Array, new_slices: &Array, first: u64, last: u64) -> Result<Array, AfError> {
+    assign_seq(input, &[Seq::default()
+                        , Seq::default()
+                        , Seq::new(first as f64, last as f64, 1.0)]
+               , new_slices)
 }
 
 pub fn lookup(input: &Array, indices: &Array, seq_dim: i32) -> Result<Array, AfError> {
@@ -148,11 +203,11 @@ pub fn lookup(input: &Array, indices: &Array, seq_dim: i32) -> Result<Array, AfE
     }
 }
 
-pub fn assign_seq(lhs: &Array, ndims: usize, seqs: &[Seq], rhs: &Array) -> Result<Array, AfError> {
+pub fn assign_seq(lhs: &Array, seqs: &[Seq], rhs: &Array) -> Result<Array, AfError> {
     unsafe{
         let mut temp: i64 = 0;
         let err_val = af_assign_seq(&mut temp as MutAfArray, lhs.get() as AfArray,
-                                    ndims as c_uint, seqs.as_ptr() as *const Seq,
+                                    seqs.len() as c_uint, seqs.as_ptr() as *const Seq,
                                     rhs.get() as AfArray);
         match err_val {
             0 => Ok(Array::from(temp)),
diff --git a/src/lib.rs b/src/lib.rs
old mode 100644
new mode 100755
index c712cb484..a819f459b
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -44,7 +44,9 @@ mod defines;
 pub use dim4::Dim4;
 mod dim4;
 
-pub use index::{Indexer, index, row, col, lookup, assign_seq, index_gen, assign_gen};
+pub use index::{Indexer, index, row, rows, col, cols, slice, slices
+                , set_row, set_rows, set_col, set_cols, set_slice, set_slices
+                , lookup, assign_seq, index_gen, assign_gen};
 mod index;
 
 pub use seq::Seq;