47 lines
1.3 KiB
Fortran
47 lines
1.3 KiB
Fortran
!>
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! @license Apache-2.0
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!
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! Copyright (c) 2020 The Stdlib Authors.
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!
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! Licensed under the Apache License, Version 2.0 (the "License");
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! you may not use this file except in compliance with the License.
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! You may obtain a copy of the License at
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!
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! http://www.apache.org/licenses/LICENSE-2.0
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!
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! Unless required by applicable law or agreed to in writing, software
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! distributed under the License is distributed on an "AS IS" BASIS,
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! WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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! See the License for the specific language governing permissions and
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! limitations under the License.
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!<
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!> Wraps `dnrm2` as a subroutine.
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!
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! @param {integer} N - number of values over which to compute the norm
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! @param {Array<double>} dx - input array
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! @param {integer} stride - stride length
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! @param {double} nrm2 - output variable reference
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!<
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subroutine dnrm2sub( N, dx, stride, nrm2 )
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implicit none
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! ..
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! External functions:
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interface
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double precision function dnrm2( N, dx, stride )
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double precision :: dx(*)
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integer :: stride, N
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end function dnrm2
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end interface
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! ..
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! Scalar arguments:
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integer :: stride, N
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double precision :: nrm2
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! ..
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! Array arguments:
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double precision :: dx(*)
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! ..
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! Compute the L2-norm:
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nrm2 = dnrm2( N, dx, stride )
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return
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end subroutine dnrm2sub |