[R] apply a color range (kind of like a heat map) to the values in each cell of a data frame

[Bert Gunter]

I haven't followed this closely, but you might wish to check the
stats::image() function to see if it might give you what you want (perhaps
with a little finagling). Feel free to ignore if you are happy with what
you have. As Jim said, there are lots of functions in various packages that
do this sort of thing.

Cheers,
Bert

On Fri, Jun 18, 2021 at 11:47 AM Yuan Chun Ding <ycding using coh.org> wrote:

> Hi Jim,
>
> Thank you so much for your help!
>
> I looked into the plotrix package, the addtable2plot function can do
> somewhat I want by creating an empty plot first.
>
> Ding
>
> -----Original Message-----
> From: Jim Lemon [mailto:drjimlemon using gmail.com]
> Sent: Thursday, June 17, 2021 8:29 PM
> To: Yuan Chun Ding <ycding using coh.org>
> Cc: r-help using r-project.org
> Subject: Re: [R] apply a color range (kind of like a heat map) to the
> values in each cell of a data frame
>
> Hi Ding,
> There are a number of "value to color" functions in various packages.
> One is "color.scale" in the plotrix package:
>
> library(plotrix)
> s1
> <-c(0.085,0.086,0.139,0.129,0.235,0.177,0.000,0.126,0.271,0.000,0.083,0.163)
> s2
> <-c(0.000,0.093,0.000,0.080,0.072,0.388,0.138,0.107,0.000,0.000,0.474,0.000)
> s13
> <-c(0.000,0.077,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.166,0.308,0.000)
> s3
> <-c(0.000,0.478,0.000,0.332,0.163,0.000,0.000,0.000,0.145,0.469,0.000,0.000)
> test1 <-data.frame(s1,s2,s13,s3)
> # generate a matrix of colors
> test1.col<-color.scale(as.matrix(test1),extremes=c("white","blue"))
>
> color.scale calculates colors using linear interpolation of the values in
> three color spaces (RGB, HSV or HCL). You may be interested in some of the
> plotting functions in plotrix that employ color.scale, particularly
> "size_n_color".
>
> Jim
>
> On Fri, Jun 18, 2021 at 10:04 AM Yuan Chun Ding <ycding using coh.org> wrote:
> >
> > Dear R users,
> >
> > I have a numeric table with 140 rows and 30 columns, here I only made
> partial table,  test1,  as an example.  I want to apply a blue color range
> to the value in each cell of  the data frame test1.
> > I found some R code using DT library. However, I only can see the
> colored table at my R studio viewer window, also only show the first 10
> rows.  I hope to save the colored table into a PNG file and want to modify
> the size of each cell, so I can apply the code to a much bigger table with
> 140 rows and 30 column.
> >
> > Can you help me?
> >
> > Thank you very much!!
> >
> > Ding
> >
> > s1
> > <-c(0.085,0.086,0.139,0.129,0.235,0.177,0.000,0.126,0.271,0.000,0.083,
> > 0.163)
> > s2
> > <-c(0.000,0.093,0.000,0.080,0.072,0.388,0.138,0.107,0.000,0.000,0.474,
> > 0.000)
> > s13
> > <-c(0.000,0.077,0.000,0.000,0.000,0.000,0.000,0.000,0.000,0.166,0.308,
> > 0.000)
> > s3
> > <-c(0.000,0.478,0.000,0.332,0.163,0.000,0.000,0.000,0.145,0.469,0.000,
> > 0.000)
> > test1 <-data.frame(s1,s2,s13,s3)
> > row.names(test1)<c("COH_001","COH_002","COH_003","COH_004","COH_005","
> > COH_006","COH_007","COH_008","COH_009","COH_010","COH_011","COH_012")
> >
> > library(DT)
> >
> > dtable1 <- datatable(test1, rownames=TRUE, options = list(lengthChange
> > = FALSE, dom='t'))
> >
> > colRamp <- colorRamp(c("white","blue")) for(column in names(test1)){
> >   x <- na.omit(test1[[column]])
> >   brks <- quantile(x, probs = seq(.05, .95, .01))
> >   RGB <- colRamp(c(0, (brks-min(x))/(max(x)-min(x))))
> >   clrs <- apply(RGB, 1, function(rgb){
> >     sprintf("rgb(%s)", toString(round(rgb,0)))
> >   })
> >   dtable1 <- dtable1 %>%
> >     formatStyle(column, backgroundColor = styleInterval(brks, clrs)) }
> >
> > dtable1
> >
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