[R] Plot dataframe with color based on a column value

[Bert Gunter]

1. lines() *is* base R.

2. See the col argument of ?plot.default.


Bert Gunter

"The trouble with having an open mind is that people keep coming along and
sticking things into it."
-- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


On Sun, Jan 24, 2021 at 6:48 AM Luigi Marongiu <marongiu.luigi using gmail.com>
wrote:

> Hello
> is it possible to color the data of a dataframe according to the
> values of one column?
> I have a dataframe that OI have subdivided into X and Y, with a third
> Z with the sample number. I would like to plot Y~X but coloring using
> Z. But I would like to use base R and not lines.
> Is that possible?
> Thank you
>
> ```
> d <- 2
> K <- 10^13
> A1_0 <- 1
> A2_0 <- 100
> A3_0 <- 500
> A4_0 <- 10000
> PCR <- function(initCopy, dupRate, Carry) {
>   ROI_T = initCopy
>   A = array()
>   for (i in 1:45) {
>     ROI_TplusOne <- ROI_T * dupRate * (1 - ROI_T/Carry)
>     A[i] <- ROI_TplusOne
>     ROI_T <- ROI_TplusOne
>   }
>   return(A)
> }
> A1 <- PCR(A1_0, d, K)
> A2 <- PCR(A2_0, d, K)
> A3 <- PCR(A3_0, d, K)
> A4 <- PCR(A4_0, d, K)
> # store results and plot
> Z <- c(rep(1, 45), rep(2, 45), rep(3, 45), rep(4, 45))
> X = rep(1:45,4)
> Y = c(A1, A2, A3, A4)
> ROI <- data.frame(Z, X, Y)
> plot(Y ~ X, data = ROI, type = "l", lwd = 3)
> ```
>
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