Keywords: gildas-prog

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## GR4_CURVE - GR8_CURVE

`GR4_CURVE(NXY,X,Y,Z,VAR,PER,BVAL,EVAL,ERROR)`

Plots a smooth curve from the (X,Y) values using the requested interpolant. Z is either a dummy argument or a parameter for the curve representation depending on the `VAR` value. `VAR` indicates which is the variable to use for interpolation. `PER` indicates whether the curve is periodic or not. `BVAL` and `EVAL` define the blanking value and the blanking tolerance (set `EVAL` negative to disable blanking checking). `ERROR` is an error flag set if the curve could not be produced. The current accuracy is used for the interpolation.

    Arguments :
            NXY     INTEGER         Input
            X       REAL (NXY)      Input
            Y       REAL (NXY)      Input
            VAR     CHARACTER*(*)   Input
            PER     LOGICAL         Input
            BVAL    REAL            Input
            EVAL    REAL            Input
            ERROR   LOGICAL         Output