Add more functions to initialize DMat and DVec.

src/dmat.rs

@@ -1,5 +1,5 @@
 use std::num::{One, Zero};
-use std::vec::from_elem;
+use std::vec;
 use std::cmp::ApproxEq;
 use std::util;
 use traits::inv::Inv;
@@ -23,11 +23,7 @@ impl<N: Zero + Clone> DMat<N> {
     ///   components.
     #[inline]
     pub fn new_zeros(nrows: uint, ncols: uint) -> DMat<N> {
-        DMat {
+        DMat::from_elem(nrows, ncols, Zero::zero())
-            nrows: nrows,
-            ncols: ncols,
-            mij:   from_elem(nrows * ncols, Zero::zero())
-        }
     }
 
     /// Tests if all components of the matrix are zeroes.
@@ -37,6 +33,38 @@ impl<N: Zero + Clone> DMat<N> {
     }
 }
 
+impl<N: One + Clone> DMat<N> {
+    /// Builds a matrix filled with a given constant.
+    #[inline]
+    pub fn new_ones(nrows: uint, ncols: uint) -> DMat<N> {
+        DMat::from_elem(nrows, ncols, One::one())
+    }
+}
+
+impl<N: Clone> DMat<N> {
+    /// Builds a matrix filled with a given constant.
+    #[inline]
+    pub fn from_elem(nrows: uint, ncols: uint, val: N) -> DMat<N> {
+        DMat {
+            nrows: nrows,
+            ncols: ncols,
+            mij:   vec::from_elem(nrows * ncols, val)
+        }
+    }
+}
+
+impl<N> DMat<N> {
+    /// Builds a matrix filled with a given constant.
+    #[inline(always)]
+    pub fn from_fn(nrows: uint, ncols: uint, f: &fn(uint, uint) -> N) -> DMat<N> {
+        DMat {
+            nrows: nrows,
+            ncols: ncols,
+            mij:   vec::from_fn(nrows * ncols, |i| { let m = i % ncols; f(m, m - i * ncols) })
+        }
+    }
+}
+
 // FIXME: add a function to modify the dimension (to avoid useless allocations)?
 
 impl<N: One + Zero + Clone> DMat<N> {

src/dvec.rs

@@ -1,6 +1,6 @@
 use std::num::{Zero, One, Algebraic};
+use std::vec;
 use std::vec::{VecIterator, VecMutIterator};
-use std::vec::from_elem;
 use std::cmp::ApproxEq;
 use std::iterator::FromIterator;
 use traits::vector::{Vec, AlgebraicVec};
@@ -22,7 +22,7 @@ impl<N: Zero + Clone> DVec<N> {
     ///   * `dim` - The dimension of the vector.
     #[inline]
     pub fn new_zeros(dim: uint) -> DVec<N> {
-        DVec { at: from_elem(dim, Zero::zero()) }
+        DVec::from_elem(dim, Zero::zero())
     }
 
     /// Tests if all components of the vector are zeroes.
@@ -32,6 +32,33 @@ impl<N: Zero + Clone> DVec<N> {
     }
 }
 
+impl<N: One + Clone> DVec<N> {
+    /// Builds a vector filled with ones.
+    /// 
+    /// # Arguments
+    ///   * `dim` - The dimension of the vector.
+    #[inline]
+    pub fn new_ones(dim: uint) -> DVec<N> {
+        DVec::from_elem(dim, One::one())
+    }
+}
+
+impl<N: Clone> DVec<N> {
+    /// Builds a vector filled with a constant.
+    #[inline]
+    pub fn from_elem(dim: uint, elem: N) -> DVec<N> {
+        DVec { at: vec::from_elem(dim, elem) }
+    }
+}
+
+impl<N: Clone> DVec<N> {
+    /// Builds a vector filled with the result of a function.
+    #[inline(always)]
+    pub fn from_fn(dim: uint, f: &fn(uint) -> N) -> DVec<N> {
+        DVec { at: vec::from_fn(dim, |i| f(i)) }
+    }
+}
+
 impl<N> Iterable<N> for DVec<N> {
     fn iter<'l>(&'l self) -> VecIterator<'l, N> {
         self.at.iter()