do not use strides

Author: perazz

src/stdlib_linalg_norms.fypp

@@ -8,7 +8,7 @@
 ! Vector norms
 submodule(stdlib_linalg) stdlib_linalg_norms
      use stdlib_linalg_constants
-     use stdlib_linalg_blas!, only: nrm2
+     use stdlib_linalg_blas, only: nrm2
      use stdlib_linalg_lapack, only: lange
      use stdlib_linalg_state, only: linalg_state_type, linalg_error_handling, LINALG_ERROR, &
          LINALG_INTERNAL_ERROR, LINALG_VALUE_ERROR     
@@ -169,7 +169,7 @@ submodule(stdlib_linalg) stdlib_linalg_norms
 
         type(linalg_state_type) :: err_
 
-        integer(ilp) :: sze,norm_request,str
+        integer(ilp) :: sze,norm_request
         real(${rk}$) :: rorder
         ${rt}$, pointer :: a1d(:)
         intrinsic :: abs, sum, sqrt, maxval, minval, conjg
@@ -198,7 +198,7 @@ submodule(stdlib_linalg) stdlib_linalg_norms
                 nrm = sum( abs(a) )
             case(NORM_TWO)            
                 #:if rank==1
-                nrm = nrm2(sze,a,incx=stride_1d(a))
+                nrm = nrm2(sze,a,incx=1)
                 #:elif rt.startswith('complex')
                 nrm = sqrt( real( sum( a * conjg(a) ), ${rk}$) )                
                 #:else

test/linalg/test_linalg_norm.fypp

@@ -80,6 +80,21 @@ module test_linalg_norm
                          '2d-reshaped ${rt}$ norm(a,2)')
         if (allocated(error)) return        
 
+        ! Test row norm (strided access)
+        slice = twod(3,:) 
+        call check(error,abs(norm(twod(3,:),2)-norm(slice,2))<tol*max(1.0_${rk}$,norm(twod(3,:),2)), &
+                         'row ${rt}$ norm(t(3,:),2)')
+        if (allocated(error)) return                
+
+
+        ! Test column norm (strided access)
+        slice = twod(::2,3) 
+        call check(error,abs(norm(twod(::2,3),2)-norm(slice,2))<tol*max(1.0_${rk}$,norm(twod(::2,3),2)), &
+                         'column ${rt}$ norm(t(::2,3),2)')
+        if (allocated(error)) return                
+
+        
+        
     end subroutine test_strided_1d_${ri}$    
 
     #:for rank in range(1, MAXRANK)