[R] Daily Category Revenue-Stacked Bar Chart in ggplot2

[Hidden Markov Model]

I am trying to use the ggplot2 to build a stacked bar chart for daily Revenue
by category. The chart would look have date on the x-axis, and revenue on
the y axis. The fill would be the categories themselves. I have searched a
great deal and have been unable to find exactly how to do this.



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