nag_band_real_mat_print (x04cec) (PDF version)
x04 Chapter Contents
x04 Chapter Introduction
NAG C Library Manual

NAG Library Function Document

nag_band_real_mat_print (x04cec)

+ Contents

    1  Purpose
    7  Accuracy
    9  Example

1  Purpose

nag_band_real_mat_print (x04cec) is an easy-to-use function to print a double band matrix .

2  Specification

#include <nag.h>
#include <nagx04.h>
void  nag_band_real_mat_print (Nag_OrderType order, Integer m, Integer n, Integer kl, Integer ku, const double a[], Integer pda, const char *title, const char *outfile, NagError *fail)

3  Description

nag_band_real_mat_print (x04cec) prints a double band matrix stored in packed form. It is an easy-to-use driver for nag_band_real_mat_print_comp (x04cfc). The function uses default values for the format in which numbers are printed, for labelling the rows and columns, and for output record length.
nag_band_real_mat_print (x04cec) will choose a format code such that numbers will be printed with a %8.4f, a %11.4f or a %13.4e format. The %8.4f code is chosen if the sizes of all the matrix elements to be printed lie between 0.001 and 1.0. The %11.4f code is chosen if the sizes of all the matrix elements to be printed lie between 0.001 and 9999.9999. Otherwise the %13.4e code is chosen.
The matrix is printed with integer row and column labels, and with a maximum record length of 80.
The matrix is output to the file specified by outfile or, by default, to standard output.

4  References

None.

5  Arguments

1:     orderNag_OrderTypeInput
On entry: the order argument specifies the two-dimensional storage scheme being used, i.e., row-major ordering or column-major ordering. C language defined storage is specified by order=Nag_RowMajor. See Section 3.2.1.3 in the Essential Introduction for a more detailed explanation of the use of this argument.
Constraint: order=Nag_RowMajor or Nag_ColMajor.
2:     mIntegerInput
3:     nIntegerInput
On entry: the number of rows and columns of the band matrix, respectively, to be printed.
If either m or n is less than 1, nag_band_real_mat_print (x04cec) will exit immediately after printing title; no row or column labels are printed.
4:     klIntegerInput
On entry: the number of subdiagonals of the band matrix A.
Constraint: kl0.
5:     kuIntegerInput
On entry: the number of superdiagonals of the band matrix A.
Constraint: ku0.
6:     a[dim]const doubleInput
Note: the dimension, dim, of the array a must be at least
  • max1,pda×n when order=Nag_ColMajor;
  • max1,m×pda when order=Nag_RowMajor.
On entry: the band matrix to be printed.
This is stored as a notional two-dimensional array with row elements or column elements stored contiguously. The storage of elements Aij, for row i=1,,m and column j=max1,i-kl,,minn,i+ku, depends on the order argument as follows:
  • if order=Nag_ColMajor, Aij is stored as a[j-1×pda+ku+i-j];
  • if order=Nag_RowMajor, Aij is stored as a[i-1×pda+kl+j-i].
7:     pdaIntegerInput
On entry: the stride separating row or column elements (depending on the value of order) of the matrix A in the array a.
Constraint: pdakl+ku+1.
8:     titleconst char *Input
On entry: a title to be printed above the matrix.
If title=NULL, no title (and no blank line) will be printed.
If title contains more than 80 characters, the contents of title will be wrapped onto more than one line, with the break after 80 characters.
Any trailing blank characters in title are ignored.
9:     outfileconst char *Input
On entry: the name of a file to which output will be directed. If outfile is NULL the output will be directed to standard output.
10:   failNagError *Input/Output
The NAG error argument (see Section 3.6 in the Essential Introduction).

6  Error Indicators and Warnings

NE_ALLOC_FAIL
Memory allocation failed.
NE_BAD_PARAM
On entry, argument value had an illegal value.
NE_INTERNAL_ERROR
An internal error has occurred in this function. Check the function call and any array sizes. If the call is correct then please contact NAG for assistance.
NE_NOT_APPEND_FILE
Cannot open file value for appending.
NE_NOT_CLOSE_FILE
Cannot close file value.
NE_NOT_WRITE_FILE
Cannot open file value for writing .

7  Accuracy

Not applicable.

8  Further Comments

A call to nag_band_real_mat_print (x04cec) is equivalent to a call to nag_band_real_mat_print_comp (x04cfc) with the following argument values:

ncols = 80
indent = 0
labrow = Nag_IntegerLabels
labcol = Nag_IntegerLabels
form = 0

9  Example

See Section 9 in nag_dpbtrf (f07hdc).

nag_band_real_mat_print (x04cec) (PDF version)
x04 Chapter Contents
x04 Chapter Introduction
NAG C Library Manual

© The Numerical Algorithms Group Ltd, Oxford, UK. 2012