.\" SCCSID: @(#)bessel.3m	6.2	8/30/89.TH bessel 3m VAX.SH Namej0, j1, jn, y0, y1, yn \- bessel functions.SH Syntax.nf.B #include <math.h>.PP.B double j0(\fIx\fP).B double \fIx\fP;.PP.B double j1(\fIx\fP).B double \fIx\fP;.PP.B double jn(\fIn,x\fP).B double \fIx\fP;.PP.B double y0(\fIx\fP).B double \fIx\fP;.PP.B double y1(\fIx\fP).B double \fIx\fP;.PP.B double yn(\fIn,x\fP).B double \fIx\fP;.fi.SH Description.NXR "bessel keyword (math)".NXR "j0 subroutine".NXR "j1 subroutine".NXR "jn subroutine".NXR "y0 subroutine".NXR "y1 subroutine".NXR "yn subroutine"These functions calculate bessel functions of the firstand second kinds for real arguments and integer orders..SH Return ValuesNegative arguments cause.PN y0 ,.PN y1 ,and.PN ynto return \-HUGE_VAL and set.I errnoto EDOM.Arguments too large in magnitude cause.PN j0,.PN j1,.PN jn ,.PN y0,.PN y1,and.PN ynto return zero and to set.I errnoto ERANGE..SH EnvironmentWhen your program is compiled using the System V environment,nonpositive arguments cause .PN y0 ,.PN y1and.PN ynto return the value HUGE and to set .I errnoto EDOM.In addition, a message indicating DOMAIN erroris printed on the standard error output..PPArguments too large in magnitude cause.PN j0,.PN j1,.PN y0,and.PN y1to return zero and to set.I errnoto ERANGE.In addition, a message indicating TLOSS error is printed on the standard error output..PPThese error-handling procedures may be changed with the function.MS matherr 3m .