cc [ flags ] -I/usr/local/include file(s) -L/usr/local/lib -lmcw [ ... ] #include <mathcw.h> extern float elqf (float k); extern double elq (double k); extern long double elql (long double k); extern __float80 elqw (__float80 k); extern __float128 elqq (__float128 k); extern long_long_double elqll (long_long_double k); extern decimal_float elqdf (decimal_float k); extern decimal_double elqd (decimal_double k); extern decimal_long_double elqdl (decimal_long_double k); extern decimal_long_long_double elqdll (decimal_long_long_double k);
NB: Functions with prototypes containing underscores in type names may be available only with certain extended compilers.
The companion function elk(q) provides the inverse operation, such that
k = elk(q), q = elq(k).
See M. Abramowitz & I. A. Stegun, Handbook of Mathematical Functions, Chapter 16, for definitions of the Jacobian elliptic, theta, and zeta functions.