subroutine cposl(a,lda,n,b) integer lda,n complex a(lda,1),b(1) c c cposl solves the complex hermitian positive definite system c a * x = b c using the factors computed by cpoco or cpofa. c c on entry c c a complex(lda, n) c the output from cpoco or cpofa. c c lda integer c the leading dimension of the array a . c c n integer c the order of the matrix a . c c b complex(n) c the right hand side vector. c c on return c c b the solution vector x . c c error condition c c a division by zero will occur if the input factor contains c a zero on the diagonal. technically this indicates c singularity but it is usually caused by improper subroutine c arguments. it will not occur if the subroutines are called c correctly and info .eq. 0 . c c to compute inverse(a) * c where c is a matrix c with p columns c call cpoco(a,lda,n,rcond,z,info) c if (rcond is too small .or. info .ne. 0) go to ... c do 10 j = 1, p c call cposl(a,lda,n,c(1,j)) c 10 continue c c linpack. this version dated 08/14/78 . c cleve moler, university of new mexico, argonne national lab. c c subroutines and functions c c blas caxpy,cdotc c c internal variables c complex cdotc,t integer k,kb c c solve ctrans(r)*y = b c do 10 k = 1, n t = cdotc(k-1,a(1,k),1,b(1),1) b(k) = (b(k) - t)/a(k,k) 10 continue c c solve r*x = y c do 20 kb = 1, n k = n + 1 - kb b(k) = b(k)/a(k,k) t = -b(k) call caxpy(k-1,t,a(1,k),1,b(1),1) 20 continue return end