Array, contains the following conversion parameters:

If

job

[0]

=0

, the matrix in the CSR format is converted to the BSR format;

if

job

[0]

=1

, the matrix in the BSR format is converted to the CSR format.

If

job

[1]

=0

, zero-based indexing for the matrix in CSR format is used;

if

job

[1]

=1

, one-based indexing for the matrix in CSR format is used.

If

job

[2]

=0

, zero-based indexing for the matrix in the BSR format is used;

if

job

[2]

=1

, one-based indexing for the matrix in the BSR format is used.

job

[3]

is only used for conversion to CSR format. By default, the converter saves the blocks without checking whether an element is zero or not. If

job

[3]

=1

, then the converter only saves non-zero elements in blocks.

job

[5]

- job indicator.

For conversion to the BSR format:

If

job

[5]

=0

, only arrays

jab

,

iab

are generated for the output storage.

If

job

[5]

>0

, all output arrays

absr

,

jab

, and

iab

are filled in for the output storage.

If

job

[5]

=-1

,

iab

[

m

] -

iab

[0]

returns the number of non-zero blocks.

For conversion to the CSR format:

If

job

[5]

=0

, only arrays

ja

,

ia

are generated for the output storage.

Actual row dimension of the matrix

A

for convert to the BSR format; block row dimension of the matrix

A

for convert to the CSR format.

Size of the block in the matrix

A

.

Leading dimension of the array

absr

as declared in the calling program.

ldabsr

must be greater than or equal to

mblk

*

mblk

.

(input/output)

Array containing non-zero elements of the matrix

A

. Its length is equal to the number of non-zero elements in the matrix

A

. Refer to

values

array description in Sparse Matrix Storage Formats for more details.

(input/output). Array containing the column indices for each non-zero element of the matrix

A

.

Its length is equal to the length of the array

acsr

. Refer to

columns

array description in Sparse Matrix Storage Formats for more details.

(input/output). Array of length

m

+ 1

, containing indices of elements in the array

acsr

, such that

ia

[

I

]] -

iab

[0]

is the index in the array

acsr

of the first non-zero element from the row

I

. The value of

ia

[

m

]] -

iab

[0]

is equal to the number of non-zeros. Refer to

rowIndex

array description in Sparse Matrix Storage Formats for more details.

(input/output)

Array containing elements of non-zero blocks of the matrix

A

. Its length is equal to the number of non-zero blocks in the matrix

A

multiplied by

mblk

*

mblk

. Refer to

values

array description in BSR Format for more details.

(input/output). Array containing the column indices for each non-zero block of the matrix

A

.

Its length is equal to the number of non-zero blocks of the matrix

A

. Refer to

columns

array description in BSR Format for more details.

(input/output). Array of length

(

m

+ 1)

, containing indices of blocks in the array

absr

, such that

iab

[

i

] -

iab

[0]

is the index in the array

absr

of the first non-zero element from the

i

-th row . The value of

iab

[

m

]

is equal to the number of non-zero blocks. Refer to

rowIndex

array description in BSR Format for more details.

Integer info indicator only for converting the matrix

A

from the CSR format.

If

info

=0

, the execution is successful.

If

info

=1

, it means that

mblk

is equal to 0.

If

info

=2

, it means that

ldabsr

is less than

mblk

*

mblk

and there is no space for all blocks.