Materials Algorithms Project
Program Library

Subroutine MAP_UTIL_PROD

1. Provenance of code.
2. Purpose of code.
3. Specification.
4. Description of subroutine's operation.
5. References.
6. Parameter descriptions.
7. Error indicators.
8. Accuracy estimate.
9. Any additional information.
10. Example of code
11. Auxiliary subroutines required.
12. Keywords.
13. Download source code.
14. Links.

Provenance of Source Code

H.K.D.H. Bhadeshia,
Phase Transformations Group,
Department of Materials Science and Metallurgy,
University of Cambridge,
Cambridge, U.K.

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Purpose

To calculate the product of two 3x3 matrices.

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Specification

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Description

MAP_UTIL_PROD calculates the matrix product A of the two 3x3 matrices B and C. A, B and C are in vector form.

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References

None supplied.

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Parameters

Input parameters

B,C - real arrays of dimension 9.

B and C are input marices in vector form.

Output parameters

A - real array of dimension 9.

A contains the product of B and C.

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Error Indicators

None.

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Accuracy

No information supplied.

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Further Comments

Used by the crystal analysis program MAP_CRYSTAL_PROGRAM.

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Example

1. Program text

       REAL A(9), B(9), C(9)
       INTEGER I
       READ (5,*) (B(I), I=1,9)
       READ (5,*) (C(I), I=1,9)
       CALL MAP_UTIL_PROD(A, B, C)
       WRITE (6,*) (A(I), I=1,9)
       STOP
       END

2. Program data

 1.0   2.0   0.0   3.0  -1.0   1.0   4.0  -2.0   1.0
-2.0   1.0  -3.0   4.0  -1.0   0.0   3.0   1.0   2.0

3. Program results

6.0  -1.0  -3.0  -7.0   5.0  -7.0  -13.0   7.0  -10.0

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Auxiliary Routines

None.

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Keywords

product

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Download

Download source code

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