150 lines
4.1 KiB
Fortran
150 lines
4.1 KiB
Fortran
SUBROUTINE UD01BD( MP, NP, DP, NIN, P, LDP1, LDP2, INFO )
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C
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C SLICOT RELEASE 5.0.
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C
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C Copyright (c) 2002-2009 NICONET e.V.
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C
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C This program is free software: you can redistribute it and/or
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C modify it under the terms of the GNU General Public License as
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C published by the Free Software Foundation, either version 2 of
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C the License, or (at your option) any later version.
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C
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C This program is distributed in the hope that it will be useful,
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C but WITHOUT ANY WARRANTY; without even the implied warranty of
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C MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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C GNU General Public License for more details.
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C
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C You should have received a copy of the GNU General Public License
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C along with this program. If not, see
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C <http://www.gnu.org/licenses/>.
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C
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C PURPOSE
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C
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C To read the coefficients of a matrix polynomial
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C dp-1 dp
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C P(s) = P(0) + P(1) * s + . . . + P(dp-1) * s + P(dp) * s .
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C
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C ARGUMENTS
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C
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C Input/Output Parameters
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C
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C MP (input) INTEGER
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C The number of rows of the matrix polynomial P(s).
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C MP >= 1.
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C
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C NP (input) INTEGER
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C The number of columns of the matrix polynomial P(s).
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C NP >= 1.
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C
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C DP (input) INTEGER
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C The degree of the matrix polynomial P(s). DP >= 0.
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C
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C NIN (input) INTEGER
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C The input channel from which the elements of P(s) are
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C read. NIN >= 0.
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C
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C P (output) DOUBLE PRECISION array, dimension
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C (LDP1,LDP2,DP+1)
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C The leading MP-by-NP-by-(DP+1) part of this array contains
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C the coefficients of the matrix polynomial P(s).
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C Specifically, P(i,j,k) contains the coefficient of
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C s**(k-1) of the polynomial which is the (i,j)-th element
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C of P(s), where i = 1,2,...,MP, j = 1,2,...,NP and
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C k = 1,2,...,DP+1.
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C
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C LDP1 INTEGER
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C The leading dimension of array P. LDP1 >= MP.
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C
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C LDP2 INTEGER
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C The second dimension of array P. LDP2 >= NP.
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C
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C Error Indicator
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C
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C INFO INTEGER
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C = 0: successful exit;
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C < 0: if INFO = -i, the i-th argument had an illegal
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C value.
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C
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C METHOD
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C
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C The coefficients P(i), i = 0, ..., DP, which are MP-by-NP
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C matrices, are read from the input file NIN row by row. Each P(i)
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C must be preceded by a text line. This text line can be used to
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C indicate the coefficient matrices.
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C
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C REFERENCES
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C
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C None.
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C
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C NUMERICAL ASPECTS
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C
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C None.
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C
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C CONTRIBUTOR
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C
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C Release 3.0: V. Sima, Katholieke Univ. Leuven, Belgium, June 1998.
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C Based on routine RDMAPO by A.J. Geurts, Eindhoven University of
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C Technology, Holland.
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C
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C REVISIONS
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C
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C -
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C
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C ******************************************************************
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C
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C .. Parameters ..
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DOUBLE PRECISION ZERO
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PARAMETER ( ZERO = 0.0D0 )
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C .. Scalar Arguments ..
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INTEGER DP, INFO, LDP1, LDP2, MP, NP, NIN
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C .. Array Arguments ..
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DOUBLE PRECISION P(LDP1,LDP2,*)
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C .. Local Scalars ..
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INTEGER I, J, K
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C .. External Subroutines ..
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EXTERNAL XERBLA
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C
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C .. Executable Statements ..
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C
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INFO = 0
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C
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C Check the input scalar arguments.
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C
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IF( MP.LT.1 ) THEN
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INFO = -1
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ELSE IF( NP.LT.1 ) THEN
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INFO = -2
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ELSE IF( DP.LT.0 ) THEN
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INFO = -3
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ELSE IF( NIN.LT.0 ) THEN
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INFO = -4
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ELSE IF( LDP1.LT.MP ) THEN
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INFO = -6
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ELSE IF( LDP2.LT.NP ) THEN
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INFO = -7
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END IF
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C
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IF ( INFO.NE.0 ) THEN
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C
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C Error return.
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C
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CALL XERBLA( 'UD01BD', -INFO )
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RETURN
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END IF
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C
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C Skip the text line preceding P(i) and read P(i), i = 0, ..., DP,
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C row after row.
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C
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DO 20 K = 1, DP + 1
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READ ( NIN, FMT = '()' )
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C
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DO 10 I = 1, MP
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READ ( NIN, FMT = * ) ( P(I,J,K), J = 1, NP )
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10 CONTINUE
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C
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20 CONTINUE
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C
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RETURN
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C *** Last line of UD01BD ***
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END
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