NAG CL Interface
x04dec is an easy-to-use function to print a Complex band matrix.
||x04dec (Nag_OrderType order,
const Complex a,
const char *title,
const char *outfile,
The function may be called by the names: x04dec, nag_file_print_matrix_complex_band or nag_band_complx_mat_print.
prints a Complex band matrix stored in
It is an easy-to-use driver for x04dfc
. The function uses default values for the format in which numbers are printed, for labelling the rows and columns, and for output record length.
x04dec will choose a format code such that numbers will be printed with
a , a or a
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 chosen code is used to print each complex element of the matrix with the real part above the imaginary part.
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.
: 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 3.1.3
in the Introduction to the NAG Library CL Interface for a more detailed explanation of the use of this argument.
: the number of rows and columns of the band matrix, respectively, to be printed.
If either m
is less than
will exit immediately after printing title
; no row or column labels are printed.
On entry: the number of subdiagonals of the band matrix .
On entry: the number of superdiagonals of the band matrix .
– const Complex
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 .
: the stride separating row or column elements (depending on the value of order
) of the matrix
in the array
– const char *
: 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
– const char *
: the name of a file to which output will be directed. If outfile
the output will be directed to standard output.
– NagError *
The NAG error argument (see Section 7
in the Introduction to the NAG Library CL Interface).
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.
Parallelism and Performance
x04dec is not threaded in any implementation.
A call to x04dec
is equivalent to a call to x04dfc
with the following argument values: