[R] Reg: Help in assigning colors to factor variable in ggplot2

[John Kane]

Here is a rough guess at what you may want with a bit of mock data and
using ggplot2.
##=================================================#
library(ggplot2)
library(RColorBrewer)

dat1  <- data.frame(aa = sample(1:10, 20, replace = TRUE), bb =
sample(21:30, 20, replace = TRUE),
                    outcome = sample(c("died", "home", "other
hospital","secondary care/rehab"), 20, replace = TRUE ))
ggplot(dat1, aes(aa, bb, colour = outcome)) + geom_point() +
    scale_colour_brewer(palette = "Dark2") +
labs(
x = "Maximum body temperature",
y =  "Maximum heart rate",
colour = "outcome",
title ="500 ICU patients"
)
 ##====================================================##

On Mon, 26 Dec 2022 at 09:46, John Kane <jrkrideau using gmail.com> wrote:

> I suspect you may be mixing *plot()* commands with *ggplot()* commands and
> they are likely incompatible.
>
> Could you supply some sample data and any error messages that you are
> getting?   A handy way to supply some sample data is the dput() function.
> In the case of a large dataset something like dput(head(mydata, 100))
> should supply the data we need.
>
> On Mon, 26 Dec 2022 at 09:06, Upananda Pani <upananda.pani using gmail.com>
> wrote:
>
>> Dear All,
>>
>> I am trying to plot a scatter plot between  temperature and heart rate and
>> additionally marking the outcome of the patients by colors. I am using the
>> standard package Use the standard function plot as well as the functions
>> of
>> package "ggplot2" (Wickham (2009)). Save the plots in pdf files.
>>
>> I am geeting an error to plot when assigning colsOutcome to the
>> scatterplot. I am doing it wrongly. Please advise me.
>> ```{r}
>> library(ggplot2)
>> library(RColorBrewer)
>> library(ggsci)
>> ICUData <- read.csv(file = "ICUData.csv")
>> ```
>> ```{r}
>> ## Generate empty vector
>> colsOutcome <- character(nrow(ICUData))
>> ## Fill with colors
>> colsOutcome[ICUData$outcome == "died"] <- "#E41A1C"
>> colsOutcome[ICUData$outcome == "home"] <- "#377EB8"
>> colsOutcome[ICUData$outcome == "other hospital"] <- "#4DAF4A8"
>> colsOutcome[ICUData$outcome == "secondary care/rehab"] <- "#984EA3"
>> ```
>>
>> ```{r}
>> plot(x = ICUData$temperature, y = ICUData$heart.rate, pch = 19,
>>      xlab = "Maximum body temperature", ylab = "Maximum heart rate",
>>      main = "500 ICU patients", col = colsOutcome, xlim = c(33,43))
>> legend(x = "topleft", legend = c("died", "home", "other hospital",
>> "secondary care/rehab"), pch = 19,
>>        col = c("#E41A1C", "#377EB8", "#4DAF4A8", "#984EA3"))
>> ```
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>> and provide commented, minimal, self-contained, reproducible code.
>>
>
>
> --
> John Kane
> Kingston ON Canada
>


-- 
John Kane
Kingston ON Canada

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