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A subroutine naming convention is employed in which each subroutine name is a coded specification of the computation done by that subroutine. All names consist of five letter in the form TXXYY. The first letter, T, indicates the matrix data type. Standard FORTRAN allows the use of three such types: S REAL D DOUBLE PRECISION C COMPLEX In addition, some FORTRAN systems (alas, NOT the DEC-20!) allow a double precision complex type: Z COMPLEX*16 The next two letters, XX, indicate the form of the matrix or its decomposition: CH Cholesky decomposition GB General band GE General GT General tridiagonal HI Hermitian indefinite HP Hermitian indefinite packed PB Positive definite band PO Positive definite PP Positive definite packed PT Positive definite tridiagonal QR Orthogonal-triangular decomposition SI Symmetric indefinite SP Symmetric indefinite packed SV Singular value decomposition TR Triangular The final two letters, YY, indicate the computation done by a particular subroutine: CO Factor and estimate condition DC Decompose DD Downdate DI Determinant and/or inverse and/or inertia EX Exchange FA Factor SL Solve UD Update The following chart shows all the LINPACK subroutine. The initial S in the names may be replaced by D, C, or Z, and the initial C in the complex-only names may be replaced by a Z. CO FA SL DI SGE * * * * SGB * * * * SPO * * * * SPP * * * * SPB * * * * SSI * * * * SSP * * * * CHI * * * * CHP * * * * STR * * * SGT * SPT * DC SL UD DD EX SCH * * * * SQR * * SSV *