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4.2 AMAT2

Aim:

Linearly combine two symmetric matrices  A1 and A2 stored in data structures AMAT1 and AMAT2. The result is a AMAT data structure, which contains the matrix .

Utilization:

• dimension array M (in the blank common),
• call INITI,
• create the input data structures AMAT1 and AMAT2.

Call the module:

                          
       CALL AMAT2(M,ALPHA1,NFAMA1,NIAMA1,
     +              ALPHA2,NFAMA2,NIAMA2,
     +                     NFAMAS,NIAMAS)

where:

• M: the super array,
• ALPHA1 (double precision): the multiplication coefficient of matrix A1,
• NFAMA1: the number of the support file of I.D.S. AMAT: AMAT1,
• NIAMA1: its level number,
• ALPHA2 (double precision): the multiplication coefficient of matrix A2,
• NFAMA2: the number of the support file of I.D.S. AMAT: AMAT2,
• NIAMA2: its level number,
• NFAMAS: the number of the support file of O.D.S. AMAT: AMAS,
• NIAMAS: its level number.

  Note:

  if NIAMA1=NIAMAS (resp. if NIAMA2=NIAMAS) the skeleton ( the skeleton of matrix A is the set of indices ) of A2 must be contained inside the skeleton of A1 (resp. the skeleton of A1 must be contained inside that of A2).

  In addition, if NIAMA1=NIAMA2, then NFAMA1 and NFAMA2 must be equal.