carta
pspttrs(3)

pspttrs3

Solve a system of linear equations a(1:n, ja:ja+n-1) * x = b(ib:ib+n-1, 1:nrhs)

Purpose

PSPTTRS solves a system of linear equations

where A(1:N, JA:JA+N-1) is the matrix used to produce the factors stored in A(1:N,JA:JA+N-1) and AF by PSPTTRF.
A(1:N, JA:JA+N-1) is an N-by-N real
tridiagonal symmetric positive definite distributed
matrix.

Routine PSPTTRF MUST be called first.

From scalapack-doc 1.5-11 in Debian 11 (Bullseye). Parsed by carta from the page's man source.