Fix getcolptr for sparse matrix views

Author: dkarrasch

test/linalg.jl

@@ -158,8 +158,8 @@ begin
         MAW = tr(wr(MA))
         @test AW * B ≈ MAW * B
         # and for SparseMatrixCSCView - a view of all rows and unit range of cols
-        vAW = tr(wr(view(A, :, 1:n)))
-        vMAW = tr(wr(view(MA, :, 1:n)))
+        vAW = tr(wr(view([A A], :, (n+1):2n)))
+        vMAW = tr(wr(view([MA MA], :, (n+1):2n)))
         @test vAW * B ≈ vMAW * B
     end
     a = sprand(rng, ComplexF64, n, n, 0.01)
@@ -170,8 +170,8 @@ begin
         MAW = tr(wr(ma))
         @test AW * B ≈ MAW * B
         # and for SparseMatrixCSCView - a view of all rows and unit range of cols
-        vAW = tr(wr(view(a, :, 1:n)))
-        vMAW = tr(wr(view(ma, :, 1:n)))
+        vAW = tr(wr(view([a a], :, (n+1):2n)))
+        vMAW = tr(wr(view(ma, :, (n+1):2n)))
         @test vAW * B ≈ vMAW * B
     end
     A = A - Diagonal(diag(A)) + 2I # avoid rounding errors by division
@@ -181,6 +181,10 @@ begin
         AW = tr(wr(A))
         MAW = tr(wr(MA))
         @test AW \ B ≈ MAW \ B
+        # and for SparseMatrixCSCView - a view of all rows and unit range of cols
+        vAW = tr(wr(view([a a], :, (n+1):2n)))
+        vMAW = tr(wr(view(ma, :, (n+1):2n)))
+        @test vAW \ B ≈ vMAW \ B
     end
     @testset "triangular singular exceptions" begin
         A = LowerTriangular(sparse([0 2.0;0 1]))