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SLAED9(l)) SLAED9(l)SLAED9 - find the roots of the secular equation, as defined by the values in D, Z, and RHO, between KSTART and KSTOPNAMESUBROUTINE SLAED9( K, KSTART, KSTOP, N, D, Q, LDQ, RHO, DLAMDA, W, S, LDS, INFO ) INTEGER INFO, K, KSTART, KSTOP, LDQ, LDS, N REAL RHO REAL D( * ), DLAMDA( * ), Q( LDQ, * ), S( LDS, * ), W( * )SYNOPSISSLAED9 finds the roots of the secular equation, as defined by the values in D, Z, and RHO, between KSTART and KSTOP. It makes the appropriate calls to SLAED4 and then stores the new matrix of eigenvectors for use in cal- culating the next level of Z vectors.PURPOSEK (input) INTEGER The number of terms in the rational function to be solved by SLAED4. K >= 0. KSTART (input) INTEGER KSTOP (input) INTEGER The updated eigenvalues Lambda(I), KSTART <= I <= KSTOP are to be computed. 1 <= KSTART <= KSTOP <= K. N (input) INTEGER The number of rows and columns in the Q matrix. N >= K (delation may result in N > K). D (output) REAL array, dimension (N) D(I) contains the updated eigenvalues for KSTART <= I <= KSTOP. Q (workspace) REAL array, dimension (LDQ,N) LDQ (input) INTEGER The leading dimension of the array Q. LDQ >= max( 1, N ). RHO (input) REAL The value of the parameter in the rank one update equation. RHO >= 0 required. DLAMDA (input) REAL array, dimension (K) The first K elements of this array contain the old roots of the deflated updating problem. These are the poles of the secular equation. W (input) REAL array, dimension (K) The first K elements of this array contain the components of the deflation-adjusted updating vector. S (output) REAL array, dimension (LDS, K) Will contain the eigenvectors of the repaired matrix which will be stored for subsequent Z vector cal- culation and multiplied by the previously accumulated eigenvectors to update the system. LDS (input) INTEGER The leading dimension of S. LDS >= max( 1, K ). INFO (output) INTEGER = 0: successful exit. < 0: if INFO =ARGUMENTS, the i-th argument had an illegal value. > 0: if INFO = 1, an eigenvalue did not converge-iBased on contributions by Jeff Rutter, Computer Science Division, University of California at Berkeley, USAFURTHER DETAILSLAPACK version 3.015 June 2000 SLAED9(l)

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