Materials Algorithms Project
Program Library

Subroutine MAP_UTIL_MAGG

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 inverse of the magnitude of the product of two vectors. The second vector is formed by a matrix transformation on the first vector.

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Specification

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Description

MAP_UTIL_MAGG calculates the inverse of the square root of the scalar product of two vectors. The input vector [H,K,L] is operated on by the 3x3 matrix G to form the second vector.

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References

None supplied.

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Parameters

Input parameters

H, K, L - reals

H, K, L are the components of the input vector [H,K,L].

G - real array of dimension 9

G is a 3x3 matrix in vector form.

Output parameters

M - real

M is the inverse of the square root of the scalar product of the two vectors.

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Error Indicators

None.

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Accuracy

No information supplied.

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Further Comments

None.

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Example

1. Program text

       REAL H, K, L, G(9), M
       READ (5,*) 
       CALL MAP_UTIL_MAGG(H, K, L, G, M)
       WRITE (6,*) M
       STOP
       END

2. Program data

1.0   3.0   2.0
1.0  -1.0   2.0   0.0   3.0  -2.0   1.5   0.4   1.0

3. Program results

0.194625

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Auxiliary Routines

MAP_UTIL_TRANS

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Keywords

matrix transformation

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Download

Download source code

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