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SUBROUTINE UD01CD( MP, NP, DP, NIN, P, LDP1, LDP2, INFO )
C
C SLICOT RELEASE 5.0.
C
C Copyright (c) 2002-2009 NICONET e.V.
C
C This program is free software: you can redistribute it and/or
C modify it under the terms of the GNU General Public License as
C published by the Free Software Foundation, either version 2 of
C the License, or (at your option) any later version.
C
C This program is distributed in the hope that it will be useful,
C but WITHOUT ANY WARRANTY; without even the implied warranty of
C MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
C GNU General Public License for more details.
C
C You should have received a copy of the GNU General Public License
C along with this program. If not, see
C <http://www.gnu.org/licenses/>.
C
C PURPOSE
C
C To read the elements of a sparse matrix polynomial
C dp-1 dp
C P(s) = P(0) + P(1) * s + . . . + P(dp-1) * s + P(dp) * s .
C
C ARGUMENTS
C
C Input/Output Parameters
C
C MP (input) INTEGER
C The number of rows of the matrix polynomial P(s).
C MP >= 1.
C
C NP (input) INTEGER
C The number of columns of the matrix polynomial P(s).
C NP >= 1.
C
C DP (input) INTEGER
C The degree of the matrix polynomial P(s). DP >= 0.
C
C NIN (input) INTEGER
C The input channel from which the elements of P(s) are
C read. NIN >= 0.
C
C P (output) DOUBLE PRECISION array, dimension
C (LDP1,LDP2,DP+1)
C The leading MP-by-NP-by-(DP+1) part of this array contains
C the coefficients of the matrix polynomial P(s).
C Specifically, P(i,j,k) contains the coefficient of
C s**(k-1) of the polynomial which is the (i,j)-th element
C of P(s), where i = 1,2,...,MP, j = 1,2,...,NP and
C k = 1,2,...,DP+1.
C The not assigned elements are set to zero.
C
C LDP1 INTEGER
C The leading dimension of array P. LDP1 >= MP.
C
C LDP2 INTEGER
C The second dimension of array P. LDP2 >= NP.
C
C Error Indicator
C
C INFO INTEGER
C = 0: successful exit;
C < 0: if INFO = -i, the i-th argument had an illegal
C value;
C = 1 : if a row index i is read with i < 1 or i > MP or
C a column index j is read with j < 1 or j > NP or
C a coefficient degree d is read with d < 0 or
C d > DP + 1. This is a warning.
C
C METHOD
C
C First, the elements P(i,j,k) with 1 <= i <= MP, 1 <= j <= NP and
C 1 <= k <= DP + 1 are set to zero. Next the nonzero (polynomial)
C elements are read from the input file NIN. Each nonzero element is
C given by the values i, j, d, P(i,j,k), k = 1, ..., d+1, where d is
C the degree and P(i,j,k) is the coefficient of s**(k-1) in the
C (i,j)-th element of P(s), i.e., let
C d
C P (s) = P (0) + P (1) * s + . . . + P (d) * s
C i,j i,j i,j i,j
C
C be the nonzero (i,j)-th element of the matrix polynomial P(s).
C
C Then P(i,j,k) corresponds to coefficient P (k-1), k = 1,...,d+1.
C i,j
C For each nonzero element, the values i, j, and d are read as one
C record of the file NIN, and the values P(i,j,k), k = 1,...,d+1,
C are read as the following record.
C The routine terminates after the last line has been read.
C
C REFERENCES
C
C None.
C
C NUMERICAL ASPECTS
C
C None.
C
C CONTRIBUTOR
C
C Release 3.0: V. Sima, Katholieke Univ. Leuven, Belgium, June 1998.
C Based on routine RDSPOM by A.J. Geurts, Eindhoven University of
C Technology, Holland.
C
C REVISIONS
C
C -
C
C ******************************************************************
C
C .. Parameters ..
DOUBLE PRECISION ZERO
PARAMETER ( ZERO = 0.0D0 )
C .. Scalar Arguments ..
INTEGER DP, INFO, LDP1, LDP2, MP, NP, NIN
C .. Array Arguments ..
DOUBLE PRECISION P(LDP1,LDP2,*)
C .. Local Scalars ..
INTEGER D, I, J, K
C .. External Subroutines ..
EXTERNAL DLASET, XERBLA
C
C .. Executable Statements ..
C
INFO = 0
C
C Check the input scalar arguments.
C
IF( MP.LT.1 ) THEN
INFO = -1
ELSE IF( NP.LT.1 ) THEN
INFO = -2
ELSE IF( DP.LT.0 ) THEN
INFO = -3
ELSE IF( NIN.LT.0 ) THEN
INFO = -4
ELSE IF( LDP1.LT.MP ) THEN
INFO = -6
ELSE IF( LDP2.LT.NP ) THEN
INFO = -7
END IF
C
IF ( INFO.NE.0 ) THEN
C
C Error return.
C
CALL XERBLA( 'UD01CD', -INFO )
RETURN
END IF
C
DO 10 K = 1, DP+1
CALL DLASET( 'Full', MP, NP, ZERO, ZERO, P(1,1,K), LDP1 )
10 CONTINUE
C
C Read (i, j, d, P(i,j,k), k=1,...,d+1) of the nonzero elements one
C by one.
C
20 READ( NIN, FMT = *, END = 30 ) I, J, D
IF ( I.LT.1 .OR. I.GT.MP .OR. J.LT.1 .OR. J.GT.NP .OR.
$ D.LT.0 .OR. D.GT.(DP+1) ) THEN
INFO = 1
READ ( NIN, FMT = * )
ELSE
READ ( NIN, FMT = * ) ( P(I,J,K), K = 1, D+1 )
END IF
GO TO 20
C
30 CONTINUE
RETURN
C *** Last line of UD01CD ***
END
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