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emdbook (version 1.3.2.1)

gridsearch2d: Graphical grid search in 2D

Description

Given an objective function and starting ranges, computes the values over the ranges and displays them in the graphics window. User can then interactively zoom in to view interesting parts of the surface.

Usage

gridsearch2d(fun, v1min, v2min, v1max, v2max, n1 = 20, n2 = 20, logz = FALSE, sys3d = c("both", "contour", "image"), ...)

Arguments

fun
Objective function to be minimized: function of two arguments
v1min
Minimum starting value of variable 1
v2min
Minimum starting value of variable 2
v1max
Maximum starting value of variable 1
v2max
Maximum starting value of variable 2
n1
Number of grid points for variable 1
n2
Number of grid points for variable 2
logz
Display image or contour on log scale?
sys3d
Display surface as an image, contour, or both?
...
Other arguments to fun

Value

  • If a final point is chosen, a list with elements x and y, otherwise NULL.

Details

If log=TRUE, the value of the surface is rescaled to log10(m-min(m)+mindm), where mindm is the difference between the minimum and the next-largest value (or 1e-10 if this difference is zero).

At each iteration, the user is prompted to select two corners of the new range with the mouse; if this choice is confirmed then the view zooms in. When the user chooses to quit, they are asked whether they want to choose a final point (e.g. an estimate of the minimum) with the mouse.

See Also

curve3d