plot.gsi: Plot method for generalised sensitivity analysis
In multisensi: Multivariate Sensitivity Analysis

Plot method for generalised sensitivity analysis of class gsi

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## S3 method for class 'gsi'
plot(x, nb.plot = 10, nb.comp = 3, graph = 1:3, xmax=NULL,
                   beside=TRUE, cor.plot=FALSE, xtick=TRUE, type="l",...)

`x`	a gsi object.
`nb.plot`	number of input factors to be considered.
`nb.comp`	number of Principal Components to be plotted.
`graph`	figures number: 1 or 2 or 3. 1 is for plotting the PCs and their sensitivity indices, 2 is for plotting the Generalised Sensitivity Indice, 3 is for plotting the Rsquare.
`xmax`	a user-defined maximal x value (x≤q 1) in all the bar graphs that show sensitivity indices; or NULL if the user wants to keep default values.
`beside`	if TRUE, the main and total sensitivity indices are represented by two bars; if FALSE, they are represented by the same bar.
`cor.plot`	if TRUE a correlation graph is made to represent the PCs ; if FALSE (default) a functionnal boxplot of the PCs is plotted.
`xtick`	if TRUE, put column names of outputs (Y) as ticks for the x axis.
`type`	what type of plot should be drawn for correlation graph ("l" for lines).
`...`	graphical parameters.