dx4.f
SUBROUTINE DX4 (U, IDMN, I, J, UXXX, UXXXX)
C***BEGIN PROLOGUE DX4
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Warning: this routine is not intended to be user-callable.
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C***SUBSIDIARY
C***PURPOSE Subsidiary to SEPX4
C***LIBRARY SLATEC
C***TYPE SINGLE PRECISION (DX4-S)
C***AUTHOR (UNKNOWN)
C***DESCRIPTION
C
C This program computes second order finite difference
C approximations to the third and fourth X
C partial derivatives of U at the (I,J) mesh point.
C
C***SEE ALSO SEPX4
C***ROUTINES CALLED (NONE)
C***COMMON BLOCKS SPL4
C***REVISION HISTORY (YYMMDD)
C 801001 DATE WRITTEN
C 891214 Prologue converted to Version 4.0 format. (BAB)
C 900402 Added TYPE section. (WRB)
C***END PROLOGUE DX4