plot.rknnSupport: Plot Function for Support Criterion
In rknn: Random KNN Classification and Regression

Plot support of the important features.

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## S3 method for class 'rknnSupport'
plot(x, n.var = min(30, length(x$support)),
    main = deparse(substitute(x)), bg = "gold", lcolor = "blue", ...)

`x`	a list with `support` returned from `rknnSupport`.
`n.var`	number of variables to be displayed.
`main`	text for main title.
`bg`	background color.
`lcolor`	line color.
`...`	addtional `plot` arguments.