| [2] | 1 | If your compiler does not recognize ANSI C headers,
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| 2 | compile with KR_headers defined: either add -DKR_headers
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| 3 | to the definition of CFLAGS in the makefile, or insert
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| 4 |
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| 5 | #define KR_headers
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| 6 |
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| 7 | at the top of f2c.h , cabs.c , main.c , and sig_die.c .
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| 8 |
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| 9 | Under MS-DOS, compile s_paus.c with -DMSDOS.
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| 10 |
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| 11 | If you have a really ancient K&R C compiler that does not understand
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| 12 | void, add -Dvoid=int to the definition of CFLAGS in the makefile.
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| 13 |
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| 14 | If you use a C++ compiler, first create a local f2c.h by appending
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| 15 | f2ch.add to the usual f2c.h, e.g., by issuing the command
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| 16 | make f2c.h
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| 17 | which assumes f2c.h is installed in /usr/include .
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| 18 |
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| 19 | If your system lacks onexit() and you are not using an ANSI C
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| 20 | compiler, then you should compile main.c, s_paus.c, s_stop.c, and
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| 21 | sig_die.c with NO_ONEXIT defined. See the comments about onexit in
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| 22 | the makefile.
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| 23 |
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| 24 | If your system has a double drem() function such that drem(a,b)
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| 25 | is the IEEE remainder function (with double a, b), then you may
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| 26 | wish to compile r_mod.c and d_mod.c with IEEE_drem defined.
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| 27 | On some systems, you may also need to compile with -Ddrem=remainder .
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| 28 |
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| 29 | To check for transmission errors, issue the command
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| 30 | make check
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| 31 | This assumes you have the xsum program whose source, xsum.c,
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| 32 | is distributed as part of "all from f2c/src". If you do not
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| 33 | have xsum, you can obtain xsum.c by sending the following E-mail
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| 34 | message to [email protected]
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| 35 | send xsum.c from f2c/src
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| 36 |
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| 37 | The makefile assumes you have installed f2c.h in a standard
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| 38 | place (and does not cause recompilation when f2c.h is changed);
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| 39 | f2c.h comes with "all from f2c" (the source for f2c) and is
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| 40 | available separately ("f2c.h from f2c").
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| 41 |
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| 42 | Most of the routines in libF77 are support routines for Fortran
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| 43 | intrinsic functions or for operations that f2c chooses not
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| 44 | to do "in line". There are a few exceptions, summarized below --
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| 45 | functions and subroutines that appear to your program as ordinary
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| 46 | external Fortran routines.
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| 47 |
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| 48 | 1. CALL ABORT prints a message and causes a core dump.
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| 49 |
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| 50 | 2. ERF(r) and DERF(d) and the REAL and DOUBLE PRECISION
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| 51 | error functions (with x REAL and d DOUBLE PRECISION);
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| 52 | DERF must be declared DOUBLE PRECISION in your program.
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| 53 | Both ERF and DERF assume your C library provides the
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| 54 | underlying erf() function (which not all systems do).
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| 55 |
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| 56 | 3. ERFC(r) and DERFC(d) are the complementary error functions:
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| 57 | ERFC(r) = 1 - ERF(r) and DERFC(d) = 1.d0 - DERFC(d)
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| 58 | (except that their results may be more accurate than
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| 59 | explicitly evaluating the above formulae would give).
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| 60 | Again, ERFC and r are REAL, and DERFC and d are DOUBLE
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