NAG Library Function Document
nag_band_real_mat_print (x04cec) is an easy-to-use function to print a double band matrix
||nag_band_real_mat_print (Nag_OrderType order,
const double a,
const char *title,
const char *outfile,
nag_band_real_mat_print (x04cec) prints a double band matrix stored in
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 , a or a format.
code is chosen if the sizes of all the matrix elements to be printed lie between and . The
code is chosen if the sizes of all the matrix elements to be printed lie between and . Otherwise the
code is chosen.
The matrix is printed with integer row and column labels, and with a maximum record length of .
The matrix is output to the file specified by outfile
by default, to standard output.
order – Nag_OrderTypeInput
: 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
. See Section 18.104.22.168
in the Essential Introduction for a more detailed explanation of the use of this argument.
m – IntegerInput
n – IntegerInput
: the number of rows and columns of the band matrix, respectively, to be printed.
If either m
is less than
, nag_band_real_mat_print (x04cec) will exit immediately after printing title
; no row or column labels are printed.
kl – IntegerInput
On entry: the number of subdiagonals of the band matrix .
ku – IntegerInput
On entry: the number of superdiagonals of the band matrix .
a – const doubleInput
the dimension, dim
, of the array a
must be at least
: 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
, for row
, depends on the order
argument as follows:
- if , is stored as ;
- if , is stored as .
pda – IntegerInput
: the stride separating row or column elements (depending on the value of order
) of the matrix
in the array
title – const char *Input
: a title to be printed above the matrix.
If , no title (and no blank line) will be printed.
contains more than
characters, the contents of title
will be wrapped onto more than one line, with the break after
Any trailing blank characters in title
outfile – const char *Input
: the name of a file to which output will be directed. If outfile
the output will be directed to standard output.
fail – NagError *Input/Output
The NAG error argument (see Section 3.6
in the Essential Introduction).
6 Error Indicators and Warnings
Memory allocation failed.
On entry, argument had an illegal value.
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
Cannot open file for appending.
Cannot close file .
Cannot open file for writing.
8 Parallelism and Performance
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
in nag_dpbtrf (f07hdc).