## Developer Reference

• 2020.2
• 07/15/2020
• Public Content
Contents

# mkl_?diasv

Solves a system of linear equations for a sparse matrix in the diagonal format with one-based indexing (deprecated).

## Syntax

Include Files
• mkl.fi
Description
This routine is deprecated. Use mkl_sparse_?_trsvfrom the
Intel® MKL
The
mkl_?diasv
routine solves a system of linear equations with matrix-vector operations for a sparse matrix stored in the diagonal format:
`y := alpha*inv(A)*x`
or
`y := alpha*inv(AT)* x,`
where:
alpha
is scalar,
x
and
y
are vectors,
A
is a sparse upper or lower triangular matrix with unit or non-unit main diagonal,
A
T
is the transpose of
A
.
This routine supports only one-based indexing of the input arrays.
Input Parameters
Parameter descriptions are common for all implemented interfaces with the exception of data types that refer here to the FORTRAN 77 standard types. Data types specific to the different interfaces are described in the section
"Interfaces"
below.
transa
CHARACTER*1
.
Specifies the system of linear equations.
If
transa
=
'N'
or
'n'
, then
y
:=
alpha
*inv(
A
)*
x
If
transa
=
'T'
or
't'
or
'C'
or
'c'
, then
y
:=
alpha
*inv(
A
T
)*
x
,
m
INTEGER
.
Number of rows of the matrix
A
.
alpha
REAL
for
mkl_sdiasv
.
DOUBLE PRECISION
for
mkl_ddiasv
.
COMPLEX
for
mkl_cdiasv
.
DOUBLE COMPLEX
for
mkl_zdiasv
.
Specifies the scalar
alpha
.
matdescra
CHARACTER
.
Array of six elements, specifies properties of the matrix used for operation. Only first four array elements are used, their possible values are given in
Table “Possible Values of the Parameter
matdescra
(
descra
)”
. Possible combinations of element values of this parameter are given in
Table “Possible Combinations of Element Values of the Parameter
matdescra
.
val
REAL
for
mkl_sdiasv
.
DOUBLE PRECISION
for
mkl_ddiasv
.
COMPLEX
for
mkl_cdiasv
.
DOUBLE COMPLEX
for
mkl_zdiasv
.
Two-dimensional array of size
lval
by
ndiag
, contains non-zero diagonals of the matrix
A
. Refer to
values
array des