signal.plot: Visualization of Signal Across Lookback
In cloudcell/quantstrat: Quantitative Strategy Model Framework

This function takes a list of matrix of post signal price changes and plots boxplots. Note function plots whatever is given to it therefore when there are lots paramsets, it is best to plot a smaller portion so the information can be displayed clearly.

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signal.plot(signals, rows = NULL, columns = NULL, mai = c(0.1, 0.4, 0.2,
  0.1), mgp = c(1, 1, 0), xlab = "", ylab = "", cex.main = 0.6,
  xaxt = "n", cex.axis = 0.5, h = 0, hlinecol = "red", ...)

`signals`	list of paramset forward looking price changes by asset
`rows`	number of rows for plot
`columns`	number of columns for plot
`mai`	A numerical vector of the form c(bottom, left, top, right) which gives the margin size specified in inches.
`mgp`	The margin line (in mex units) for the axis title, axis labels and axis line. Note that mgp[1] affects title whereas mgp[2:3] affect axis. The default is c(3, 1, 0).
`xlab`	a title for the x axis
`ylab`	a title for the y axis
`cex.main`	The magnification to be used for main titles relative to the current setting of cex.
`xaxt`	A character which specifies the x axis type. Specifying "n" suppresses plotting of the axis. The standard value is "s": for compatibility with S values "l" and "t" are accepted but are equivalent to "s": any value other than "n" implies plotting.
`cex.axis`	The magnification to be used for axis annotation relative to the current setting of cex.
`h`	the y-value(s) for horizontal line(s).
`hlinecol`	A specification for the default plotting color. See section ‘Color Specification’.
`...`	any other passthru parameters