CPlot:FindNearestX

CPlot:FindNearestX

The FindNearestX method returns the plot series index of the point with x coordinate nearest a target x value.

nIndex, xPt = CPlot:FindNearestX( x )

nIndex is the index of the nearest point, from 1 to CPlot:Count.

x is the x coordinate of the target point.

xPt is the x coordinate of the nearest point.

On failure, 0,0 is returned.

The following script finds the index of the point with x coordinate nearest 4.2 in series 1 of a CPlotView:

V = attachlist_plotview()	-- select the target plot window
if V == nil then Exit() end	-- if not successful, exit the script
P = V:GetPlot(1)	-- get a CPlot object for series 1
if P == nil then Exit("Bad series") end
nTargX = 4.2	-- find the point nearest x=4.2
n, xPt = P:FindNearestX( nTargX )	-- get index n and value x
Printf("Nearest: Pt[%d]=%lg\n", nTargX, n, xPt)	-- print the result