From eac0249f19904615105e123e06e8cfa458648642 Mon Sep 17 00:00:00 2001
From: Jeff Bezanson <jeff.bezanson@gmail.com>
Date: Sat, 10 Jan 2015 13:25:58 -0500
Subject: [PATCH 1/2] rename null to nullspace

---
 base/deprecated.jl   | 2 ++
 base/exports.jl      | 2 +-
 base/linalg/dense.jl | 4 ++--
 test/linalg1.jl      | 6 +++---
 4 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/base/deprecated.jl b/base/deprecated.jl
index f2889abca63e5..28f193d2bef5c 100644
--- a/base/deprecated.jl
+++ b/base/deprecated.jl
@@ -268,3 +268,5 @@ const base64 = base64encode
 @deprecate beginswith startswith
 
 @deprecate functionlocs(f,t)  map(functionloc, methods(f,t))
+
+@deprecate null nullspace
diff --git a/base/exports.jl b/base/exports.jl
index 30211b1052805..6e626204d2b46 100644
--- a/base/exports.jl
+++ b/base/exports.jl
@@ -676,7 +676,7 @@ export
     lufact,
     lyap,
     norm,
-    null,
+    nullspace,
     ordschur!,
     ordschur,
     peakflops,
diff --git a/base/linalg/dense.jl b/base/linalg/dense.jl
index 07c6321e0ea82..2a1966753c5e4 100644
--- a/base/linalg/dense.jl
+++ b/base/linalg/dense.jl
@@ -455,14 +455,14 @@ pinv(a::StridedVector) = pinv(reshape(a, length(a), 1))
 pinv(x::Number) = isfinite(one(x)/x) ? one(x)/x : zero(x)
 
 ## Basis for null space
-function null{T}(A::StridedMatrix{T})
+function nullspace{T}(A::StridedMatrix{T})
     m, n = size(A)
     (m == 0 || n == 0) && return eye(T, n)
     SVD = svdfact(A, thin=false)
     indstart = sum(SVD[:S] .> max(m,n)*maximum(SVD[:S])*eps(eltype(SVD[:S]))) + 1
     return SVD[:V][:,indstart:end]
 end
-null(a::StridedVector) = null(reshape(a, length(a), 1))
+nullspace(a::StridedVector) = nullspace(reshape(a, length(a), 1))
 
 function cond(A::StridedMatrix, p::Real=2)
     if p == 2
diff --git a/test/linalg1.jl b/test/linalg1.jl
index 9997826b32b63..56eb4865909b9 100644
--- a/test/linalg1.jl
+++ b/test/linalg1.jl
@@ -229,13 +229,13 @@ debug && println("Solve square general system of equations")
     @test_throws DimensionMismatch b\b'
     @test norm(a*x - b, 1)/norm(b) < ε*κ*n*2 # Ad hoc, revisit!
 
-debug && println("Test null")
+debug && println("Test nullspace")
     if eltya != BigFloat && eltyb != BigFloat # Revisit when implemented in julia
-        a15null = null(a[:,1:5]')
+        a15null = nullspace(a[:,1:5]')
         @test rank([a[:,1:5] a15null]) == 10
         @test_approx_eq_eps norm(a[:,1:5]'a15null, Inf) zero(eltya) 300ε
         @test_approx_eq_eps norm(a15null'a[:,1:5], Inf) zero(eltya) 400ε
-        @test size(null(b), 2) == 0
+        @test size(nullspace(b), 2) == 0
     end
 
     end # for eltyb

From b1a687a42929b97219c5e3133af9581ea76b56c3 Mon Sep 17 00:00:00 2001
From: Jeff Bezanson <jeff.bezanson@gmail.com>
Date: Sat, 10 Jan 2015 17:18:18 -0500
Subject: [PATCH 2/2] null rename: doc/news update plus one missed rename

---
 NEWS.md               | 2 ++
 base/linalg.jl        | 2 +-
 doc/stdlib/linalg.rst | 2 +-
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/NEWS.md b/NEWS.md
index 8dd5d51f6dec9..71f0ca9cda412 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -173,6 +173,8 @@ Deprecated or removed
 
   * `beginswith` is renamed to `startswith` ([#9578]).
 
+  * `null` is renamed to `nullspace`.
+
 Julia v0.3.0 Release Notes
 ==========================
 
diff --git a/base/linalg.jl b/base/linalg.jl
index 4b34c00a804b9..b5afb4930f4d9 100644
--- a/base/linalg.jl
+++ b/base/linalg.jl
@@ -84,7 +84,7 @@ export
     lufact!,
     lyap,
     norm,
-    null,
+    nullspace,
     ordschur!,
     ordschur,
     peakflops,
diff --git a/doc/stdlib/linalg.rst b/doc/stdlib/linalg.rst
index 4e7e34c036112..345c02077603e 100644
--- a/doc/stdlib/linalg.rst
+++ b/doc/stdlib/linalg.rst
@@ -479,7 +479,7 @@ Linear algebra functions in Julia are largely implemented by calling functions f
 
    Moore-Penrose pseudoinverse
 
-.. function:: null(M)
+.. function:: nullspace(M)
 
    Basis for nullspace of ``M``.