assert_is_multipanelfigure: Check that the input is a multipanelfigure
Description
Checks that the input is of class multipanelfigure and has the
appropriate attributes.
Usage
assert_is_multipanelfigure(x)
Arguments
x
Object to check.
References
Graumann, J., and Cotton, R.J. (2018). multipanelfigure: Simple
Assembly of Multiple Plots and Images into a Compound Figure. Journal of
Statistical Software 84. doi: 10.18637/jss.v084.c03