CPlotView:GetPtErrX

The GetPtErrX method returns the x errorbar value of a point in the class data matrix.

Syntax

xErr = CPlotView:GetPtErrX( n )

n is the index of the point in the data array.

xErr is the value of the x errorbar.

On success, this method returns the x errorbar value.

On failure, this method returns 0.

This method returns the x errorbar value of the specified point at index n. If n is out of range, the value 0 is returned. To remove ambiguity about whether the point truly has an x errorbar value of 0 or is out of bounds, check the index before calling this method.

Example

The following script adds some points, then finds the nearest point and prints its x errorbar value:

P = CPlotView:new()	-- create a new CPlotView
P:Add( 11.82, 70.5, 10.25, 12.4)	-- add a point
P:Add( 4.62, 90.5, 11.5, 10.2)	-- add a point
n = P:FindPoint( 4, 72)	-- get index of point nearest 4,72
Printf("n=%d,xerr=%lg\r\n",n,P:GetPtErrX(n))	-- result: n = 1, xerr = 10.25