Produces a biplot from the output of nmf
Arguments
- x
- an object of class " - nmf"
- factors
- length 2 vector specifying factors to plot. 
- matrix
- either - wor- h
- group_by
- a discrete factor giving groupings for samples or features. Must be of the same length as number of samples in - object$hor number of features in- object$w.
- ...
- for consistency with - biplotgeneric