RUDLEV

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DCL:GRPH2:UDPACK: Contour Routines: Explanation of Subroutines

8.2.8 RUDLEV

1.

Function

Determines the interval of the contour level set by UDGCLA, UDGCLB, and UDSCLV.

2.

Call

RUDLEV(NLEV)

3

Explanation of Parameters

NLEV (I) Specifies which contour interval to check. (the NLEVth contour interval.)

RUDLEV (R) The value of a floating-point function that gives the contour interval.

4.

Notes

(a): Internally, the values of the (NLEV)th and (NLEV+1)th contour levels are checked by UDQCLV (see Section 8.2.5), and the difference (the (NLEV+1)th value minus the (NLEV)th value) is returned. Note that the values of the contour levels inquired by UDQCLV are not necessarily in ascending order.
(b): Two or more contour levels must be set. Also, NLEV must be larger than 1 and smaller than the total number of contour levels set. When this condition is not satisfied, RUDVAL gives an alert message and 0 is returned.

`NLEV`	`(I)`	Specifies which contour interval to check. (the `NLEV`th contour interval.)
`RUDLEV`	`(R)`	The value of a floating-point function that gives the contour interval.