# inits.f

          FUNCTION INITS (OS, NOS, ETA)
    C***BEGIN PROLOGUE  INITS
    C***PURPOSE  Determine the number of terms needed in an orthogonal
    C            polynomial series so that it meets a specified accuracy.
    C***LIBRARY   SLATEC (FNLIB)
    C***CATEGORY  C3A2
    C***TYPE      SINGLE PRECISION (INITS-S, INITDS-D)
    C***KEYWORDS  CHEBYSHEV, FNLIB, INITIALIZE, ORTHOGONAL POLYNOMIAL,
    C             ORTHOGONAL SERIES, SPECIAL FUNCTIONS
    C***AUTHOR  Fullerton, W., (LANL)
    C***DESCRIPTION
    C
    C  Initialize the orthogonal series, represented by the array OS, so
    C  that INITS is the number of terms needed to insure the error is no
    C  larger than ETA.  Ordinarily, ETA will be chosen to be one-tenth
    C  machine precision.
    C
    C             Input Arguments --
    C   OS     single precision array of NOS coefficients in an orthogonal
    C          series.
    C   NOS    number of coefficients in OS.
    C   ETA    single precision scalar containing requested accuracy of
    C          series.
    C
    C***REFERENCES  (NONE)
    C***ROUTINES CALLED  XERMSG
    C***REVISION HISTORY  (YYMMDD)
    C   770401  DATE WRITTEN
    C   890831  Modified array declarations.  (WRB)
    C   891115  Modified error message.  (WRB)
    C   891115  REVISION DATE from Version 3.2
    C   891214  Prologue converted to Version 4.0 format.  (BAB)
    C   900315  CALLs to XERROR changed to CALLs to XERMSG.  (THJ)
    C***END PROLOGUE  INITS