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Returns the integral of the supplied vector between the ranges specified by arguments 2 and 3 divided by the span (= arg 3 -arg 2). If the values supplied for argument 2 and/or 3 do not lie on sample points, second order interpolation will be used to estimate y values at those points.
| Number | Type | Compulsory | Default | Description | 
|---|---|---|---|---|
| 1 | real | Yes | 
 | Input vector | 
| 2 | real | No | Start of input vector | start x value | 
| 3 | real | No | End of input vector | end x value | 
Return type: real
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