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4.3 CCAMAT

Aim:

Compress   array AMAT6 in structure AMAT, containing the coefficients of matrix A. It corresponds to eliminating the coefficients whose absolute value are too small according to the following criterion:

This procedure enables us to reduce the size of an existing AMAT structure to that which is strictly necessary, and can in particularly be used for the preconditioning matrix.

Utilization:

• dimension array M (in the blank common),
• call INITI.

Call the module:

           
      CALL CCAMAT(M,RAPORT,NFAMAE,NIAMAE,NFAMAS,NIAMAS)

where:

• M: the super array,
• RAPORT: the value of parameter ,
• NFAMAE: the number of the support file of I.D.S. AMAT,
• NIAMAE: its level number,
• NFAMAS: the number of the support file of O.D.S. AMAT,
• NIAMAS: its level number, (the O.D.S. can be distinct from the I.D.S.).