## UD01MD

### Printing a real matrix

[Specification] [Arguments] [Method] [References] [Comments] [Example]

Purpose

```  To print an M-by-N real matrix A row by row. The elements of A
are output to 7 significant figures.

```
Specification
```      SUBROUTINE UD01MD( M, N, L, NOUT, A, LDA, TEXT, INFO )
C     .. Scalar Arguments ..
INTEGER           INFO, L, LDA, M, N, NOUT
CHARACTER*(*)     TEXT
C     .. Array Arguments ..
DOUBLE PRECISION  A(LDA,*)

```
Arguments

Input/Output Parameters

```  M       (input) INTEGER
The number of rows of matrix A to be printed.  M >= 1.

N       (input) INTEGER
The number of columns of matrix A to be printed.  N >= 1.

L       (input) INTEGER
The number of elements of matrix A to be printed per line.
1 <= L <= 5.

NOUT    (input) INTEGER
The output channel to which the results are sent.
NOUT >= 0.

A       (input) DOUBLE PRECISION array, dimension (LDA,N)
The leading M-by-N part of this array must contain the
matrix to be printed.

LDA     INTEGER
The leading dimension of array A.  LDA >= M.

TEXT    (input) CHARACTER*72.
Title caption of the matrix to be printed (up to a
maximum of 72 characters). For example, TEXT = 'Matrix A'.

```
Error Indicator
```  INFO    INTEGER
= 0:  successful exit;
< 0:  if INFO = -i, the i-th argument had an illegal
value.

```
Method
```  The routine first prints the contents of TEXT as a title, followed
by the elements of the matrix A such that

(i)  if N <= L, the leading M-by-N part is printed;
(ii) if N = k*L + p (where k,p > 0), then k M-by-L blocks of
consecutive columns of A are printed one after another
followed by one M-by-p block containing the last p columns
of A.

Row numbers are printed on the left of each row and a column
number appears on top of each column.
The routine uses 2 + (k + 1)*(m + 1) lines and 8 + 15*c positions
per line where c is the actual number of columns, (i.e. c = L
or c = p).

```
References
```  None.

```
Numerical Aspects
```  None.

```
```  None
```
Example

Program Text

```*     UD01MD EXAMPLE PROGRAM TEXT
*     Copyright (c) 2002-2017 NICONET e.V.
*
*     .. Parameters ..
INTEGER          NIN, NOUT
PARAMETER        ( NIN = 5, NOUT = 6 )
INTEGER          MMAX, NMAX
PARAMETER        ( MMAX = 20, NMAX = 20 )
INTEGER          LDA
PARAMETER        ( LDA = MMAX )
*     .. Local Scalars ..
INTEGER          I, INFO, J, L, M, N
CHARACTER*72     TEXT
*     .. Local Arrays ..
DOUBLE PRECISION A(LDA,NMAX)
*     .. External Subroutines ..
EXTERNAL         UD01MD
*     .. Executable Statements ..
*
WRITE ( NOUT, FMT = 99999 )
*     Skip the heading in the data file and read the data.
READ ( NIN, FMT = '()' )
READ ( NIN, FMT = * ) M, N, L, TEXT
IF ( M.LE.0 .OR. M.GT.MMAX ) THEN
WRITE ( NOUT, FMT = 99996 ) M
ELSE IF ( N.LE.0 .OR. N.GT.NMAX ) THEN
WRITE ( NOUT, FMT = 99997 ) N
ELSE
READ ( NIN, FMT = * ) ( ( A(I,J), J = 1,N ), I = 1,M )
*        Print out the matrix A.
CALL UD01MD( M, N, L, NOUT, A, LDA, TEXT, INFO )
IF ( INFO.NE.0 ) WRITE ( NOUT, FMT = 99998 ) INFO
END IF
STOP
*
99999 FORMAT (' UD01MD EXAMPLE PROGRAM RESULTS',/1X)
99998 FORMAT (' INFO on exit from UD01MD = ',I2)
99997 FORMAT (/' N is out of range.',/' N = ',I5)
99996 FORMAT (/' M is out of range.',/' M = ',I5)
END
```
Program Data
``` UD01MD EXAMPLE PROGRAM DATA
4     4     4     'Matrix A'
1.0   2.0   3.0   4.0
5.0   6.0   7.0   8.0
9.0  10.0  11.0  12.0
13.0  14.0  15.0  16.0
```
Program Results
``` UD01MD EXAMPLE PROGRAM RESULTS

Matrix A ( 4X 4)

1              2              3              4
1    0.1000000D+01  0.2000000D+01  0.3000000D+01  0.4000000D+01
2    0.5000000D+01  0.6000000D+01  0.7000000D+01  0.8000000D+01
3    0.9000000D+01  0.1000000D+02  0.1100000D+02  0.1200000D+02
4    0.1300000D+02  0.1400000D+02  0.1500000D+02  0.1600000D+02

```