TDISHR intrinsics grouped by their function.

      TDISHR permits expressions with some defined or measured constants.
      These symbolic forms are easier to read and are normally more accurate
      than you would enter.
      Major sources:
      "The 1986 Adjustment of the Fundamental Physical Constants..."
        by Cohen and Taylor as listed in "Physics Today" August 1990.
      "1980 Revised NRL Plasma Formulary" by Book.

      The names appear with a dollar sign ($) and without parentheses.

$MISSING is used internally to mark a missing argument and gives zero or blanks. $MISSING and $ROPRAND execute at compilation.

$NARG is used in a FUN to get the actual number of arguments--thus its value depends on where it is used.

$THIS is set by GET_DATA of a signal or param to that descriptor.

      These routines return information about the system or values:
        ALLOCATED       BIT_SIZE        DIGITS          ELBOUND
        EPSILON         ESHAPE          ESIZE           EUBOUND
        HUGE            KIND            LBOUND          LEN
        MAXEXPONENT     MINEXPONENT     PRECISION       PRESENT
        RADIX           RANGE           RANK
        SELECTED_INT_KIND         SELECTED_REAL_KIND    SHAPE
        SIZE            SIZEOF          TINY            UBOUND

      Input/output operations interact with the operating system and should
      be avoided in coding operations for tree expressions because of their
      side effects.
        DATE_TIME       EXT_FUNCTION
        FCLOSE          FOPEN           FSEEK           FTELL           
        FSEEK           SHOW_PRIVATE    SHOW_PUBLIC     SPAWN
        WAIT            WRITE

      >>>>>>>>>WARNING, many of these have side effects.

These operations construct and access MDS and VMS descriptors.

MDS Construction:

BUILD_ACTION	BUILD_CALL	BUILD_CONDITION	BUILD_CONGLOM
BUILD_DEPENDENCY	BUILD_DIM	BUILD_DISPATCH
BUILD_EVENT	BUILD_FUNCTION	BUILD_METHOD	BUILD_PARAM
BUILD_PATH	BUILD_PROCEDURE	BUILD_PROGRAM	BUILD_RANGE
BUILD_ROUTINE	BUILD_SIGNAL	BUILD_SLOPE	BUILD_WINDOW
BUILD_WITH_UNITS
MAKE_ACTION	MAKE_CALL	MAKE_CONDITION	MAKE_CONGLOM
MAKE_DEPENDENCY	MAKE_DIM	MAKE_DISPATCH	MAKE_FUNCTION
MAKE_METHOD	MAKE_PARAM	MAKE_PROCEDURE	MAKE_PROGRAM
MAKE_RANGE	MAKE_ROUTINE	MAKE_SIGNAL	MAKE_SLOPE
MAKE_WINDOW	MAKE_WITH_UNITS

Use BUILD_xxx for immediate structure building. (From Build_Call.) Use MAKE_xxx in FUNs for evaluated non-PUBLIC variables. Use this form if IMAGE or ROUTINE must be expressions.

MDS Fields:

CLASS	DSCPTR	KIND	NDESC
ARG_OF	AXIS_OF	BEGIN_OF	CLASS_OF
COMPLETION_OF	COMPLETION_MESSAGE_OF	CONDITION_OF
DIM_OF	DISPATCH_OF	DSCPTR_OF	END_OF
ERRORLOGS_OF	HELP_OF	IDENT_OF	IMAGE_OF
INTERRUPT_OF	KIND_OF	LANGUAGE_OF
METHOD_OF	MODEL_OF	NAME_OF	NDESC_OF
OBJECT_OF	PERFORMANCE_OF	PHASE_OF	PROCEDURE_OF
PROGRAM_OF	QUALIFIERS_OF	RAW_OF	ROUTINE_OF
SLOPE_OF	TASK_OF	TIME_OUT_OF	UNITS_OF
VALIDATION_OF	VALUE_OF	WHEN_OF	WINDOW_OF
$THIS	$VALUE

MDS Information:

BUILTIN_OPCODE	CULL	DATA	DATA_WITH_UNITS
EXTEND	GETDBI	GETNCI	I_TO_X
OPCODE_BUILTIN	OPCODE_STRING	STRING_OPCODE
UNITS	USING	VALIDATION	X_TO_I

      These opcodes are similar to C-language statements.
        BREAK           CONTINUE        FOR             GOTO
        IF ... ELSE     STATEMENT       SWITCH          WHILE

      Some are modified to permit proper compilation with a minimum of
      reserved words.
        CASE            DO              LABEL           RETURN

      These are like CC expressions.
        COMMA           CONDITIONAL

      These are F90-like extensions.
        CASE DEFAULT   

      >>>>>>>>>WARNING, the "bare" tree names
        BREAK CONTINUE ELSE (after IF statement) ELSEWHERE (after
        WHERE statement) will not be acceptable to the compiler.
        Use a leading colon (:) or choose another name.

      >>>>>>>>>WARNING, while it is possible to create expressions with a
        statement subexpression, the result cannot be re-compiled
        (except for the standard statements) because the semicolon,
        keyword, or brace is syntactically wrong.

      These operations change information into new blocks of information.

      Generation:
        ARRAY           BUILD_DTYPE_RANGE       DTYPE_RANGE
	RAMP            RANDOM          REPLICATE
        SPREAD          VECTOR          ZERO

      Masking:
        ALL             ANY             COUNT           FIRSTLOC
        LASTLOC

      Mathematics:
        ACCUMULATE      

      Matrix:
        DIAGONAL        DOT_PRODUCT     

      Reduction:
        MAXLOC          MAXVAL          MEAN            MINLOC
        MINVAL          PRODUCT     
        SUM             TRIM

      Selection:
        MAP             PACK
        SORT            SORTVAL         SUBSCRIPT       UNION

      Shaping and typing:
        SET_RANGE   

      Although a few of these produce the same sized output as their input,
      the result depend on other elements. (One-for-one operations are
      elementals.)

      Opcodes associated with variables are:
        ALLOCATED       DEALLOCATE      FUN             PRESENT
        RESET_PRIVATE   RESET_PUBLIC    SHOW_PRIVATE    SHOW_PUBLIC
        VAR

      Variable names may be preceded by PRIVATE or PUBLIC to restrict the
      search for them.

      Function descriptions may use IN INOUT OPTIONAL and OUT modes.

      Of special interest are EQUALS (x=expr) EQUALS_FIRST (x+=expr, etc.)
      POST_DEC (x--) POST_INC (x++) PRE_DEC (--x) and PRE_INC (++x) and
      subscripting (x[expr]) and mapping (MAP(x,expr)).