As discussed elsewhere, in JTPACK77 matrices are typically represented by three Fortran arrays. In this manual we refer to them as a, ia, ja. The first is a floating-point array containing the values of the matrix, the second is a short integer vector containing information about how the matrix is represented, and the third is an integer vector possibly containing additional storage information.
This chapter describes in detail the second of those arrays, ia, as well as the corresponding formats for a and, if necessary, ja.
The array ia should be dimensioned to _JT_no_of_storage_parmameters_, which is currently 8.
The following describes the options available (or planned) for ia(_JT_storage_)(current index: 1), which designates the storage format for the corresponding matrix. Following a description of each format, accompanying values of ia which must be set for that format are indicated.