Allows an numRows by numCols matrix of plots to be displayed in a single plot. If the function is called with no arguments, then the plotting device layout will be reset to a single plot.
numRows
numCols
layout20x(numRows = 1, numCols = 1)
number of rows in plot array
number of columns in plot array
Function returns no value
# NOT RUN { data(course.df) layout20x(1,2) stripchart(course.df$Exam) boxplot(course.df$Exam) # }
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