Providing software solutions since 1976

• Log in
• Create profile
• Welcome
  [Log out]
• Edit profile
• My SAS

• Print  |
• Feedback  |
• Share

  • E-mail
  

  E-mail This Page

  Your Name:*
  Your E-mail:*
  Recipient E-mail:*
  Send a copy to me
  Personal Message:
  
  

  * indicates a required field

In some instances the results returned by CALL SVD and the GINV and
HOMOGEN functions may be incorrect.  To see if you are at risk for
encountering the problem, use the following check:

   PROC IML;
      START SVDCHECK(U,S,V,A);
         CALL SVD(U,S,V,A);
         SSA=SSQ(A);
         SSS=SSQ(S);
         /******************************************/
         /* Validation part                        */
         /* Reconstruct A from the decomposition   */
         /******************************************/
         B = U * DIAG(S) * V`;
         /******************************************/
         /* Check the difference                   */
         /******************************************/
         N=NROW(S);
         EPS=CONSTANT('sqrtmaceps');
         IF MAX(ABS(A-B)) > EPS * MAX(ABS(A))
            | MAX(ABS(U`*U)-I(N)) > EPS
            | MAX(ABS(V`*V)-I(N)) > EPS
            | ABS(SSA-SSS) > EPS * MAX(SSA,SSS)
         THEN DO;
            PRINT 'Problem Encountered', A;
         END;
         ELSE DO;
            PRINT 'OK';
         END;
         RETURN;
      FINISH;



A Technical Support hot fix for Release 8.2 TSLEVEL TS2M0 for this
issue is available at:

http://www.sas.com/techsup/download/hotfix/82_sbcs_prod_list.html#007033

Operating System and Release Information

A fix for Release 8.2 (TS2M0) for this issue is available at: