[R] Calendar Heat Map

[Jeff Newmiller]

ggplot automatically chooses continuous or discrete scales depending on the type of column you give it... so don't give it a numeric column (integers are a subset of numeric)... give it a character (lazy) or factor (better for controlling what the output looks like) value for your colour specification.

Read

?cut

for one clean way to make a new factor column in your data set before you give it to ggplot. Note that if you don't like the labels it generates automatically you can specify them yourself.

On February 5, 2019 2:28:28 PM PST, reichmanj using sbcglobal.net wrote:
>r-Help Form
>
> 
>
>I'm working on a "Time-Series Calendar Heatmap" using the following
>code.
>
> 
>
>ggplot(myData, aes(monthweek, weekdayf, fill = myData $adjusted)) + 
>
>geom_tile(colour = "white") + facet_grid(year(myData $date)~monthf) + 
>
>scale_fill_gradient(low="red", high="green") + 
>
>xlab("Week of Month") + ylab("") + 
>
>ggtitle("Time-Series Calendar Heatmap ") + labs(fill = "Price")
>
> 
>
>While the ggplot commands do (almost) what I want I can't figure out
>how to
>change my color scaling. While scale_fill_gradient(low="red",
>high="green")
>does what I ask, that is create a color gradient from red to green it
>not
>what I thought it would be. What I need is discreet colors something
>like 0
>- grey; 1:5 - blue; 6:10 - green etc.  How to I set discrete colors for
>groups of values. A color ramp would work but I need to separately
>color
>those cells with 0 counts.
>
> 
>
>Jeff Reichman
>
>
>	[[alternative HTML version deleted]]
>
>______________________________________________
>R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
>https://stat.ethz.ch/mailman/listinfo/r-help
>PLEASE do read the posting guide
>http://www.R-project.org/posting-guide.html
>and provide commented, minimal, self-contained, reproducible code.

-- 
Sent from my phone. Please excuse my brevity.