[R] adding percentage secondary y-axis

John Kane jrkrideau at yahoo.ca
Thu Nov 23 19:21:41 CET 2017 

 
Actually Petr, I don't see that a secondary y-axis a problem here. If I understand it correctly Eliza is simply presenting the same data against two different scales. We in North America sometimes need to do the same thing when graphing, say  temperature data. We might want degrees Celsius on the y-axis and degrees Fahrenheit on the secondary y-axis because the USA still uses the antiquated Imperial measurement system. I don't think even Hadley would object here.
The deadly sin of a secondary y-axis is when there are two different variables are being graphed, say speed on the first axis and gasoline consumption on the other axis.  It creates a perceptual nightmare.  
    On Thursday, November 23, 2017, 12:28:36 PM EST, Eliza Botto <eliza_botto at outlook.com> wrote:  
 
 Thank you very much peter.

It worked out nicely.

I have additional question. How can I get Y-axis on log-scale?

Thank you very much in Advance,


Eliza

UoS
PP


________________________________
From: PIKAL Petr <petr.pikal at precheza.cz>
Sent: 23 November 2017 16:22:39
To: Eliza Botto; r-help at r-project.org
Subject: RE: adding percentage secondary y-axis

Hi

It is usually not recommended but if you insist

maybe
library(plotrix)
?twoord.plot
twoord.plot(lx=D[,1],ly=D[,2], rx=D[,1], ry=D[,3])

or

plot.yy(x=D[,1],yright=D[,3], yleft=D[,2])

which allows only one x axis (see below).

Cheers
Petr

plot.yy <- function (x, yright, yleft, yleftlim = NULL, yrightlim = NULL,
    xlab = NULL, yylab = list(NA, NA), pch = c(1, 2),
    col = c(1,2), linky = F, smooth = 0, lwds = 1, length = 10,
        format = "%d/%m", rect = NULL, type = "p", ...)
{
    par(mar = c(5, 4, 4, 2), oma = c(0, 0, 0, 3))
    plot(x, yright, ylim = yrightlim, axes = F, ylab = "", xlab = xlab,
        pch = pch[1], col = col[1], type = type, ...)
    if (!is.null(rect))
        rect(x[rect[1]], rect[2], x[rect[3]], rect[4], col = "grey")
    points(x, yright, ylim = yrightlim, ylab = "", xlab = xlab,
        pch = pch[1], col = col[1], ...)
    axis(4, pretty(range(yright, na.rm = T), 10), col = col[1])
    if (linky)
        lines(x, yright, col = col[1], ...)
    if (smooth != 0)
        lines(supsmu(x, yright, span = smooth), col = col[1],
            lwd = lwds, ...)
    if (is.na(yylab[[1]]))
        mtext(deparse(substitute(yright)), side = 4, outer = T,
            line = 1, col = col[1], ...)
    else mtext(yylab[[1]], side = 4, outer = T, line = 1, col = col[1],
        ...)
    par(new = T)
    plot(x, yleft, ylim = yleftlim, ylab = "", axes = F, xlab = xlab,
        pch = pch[2], col = col[2], ...)
    box()
    axis(2, pretty(range(yleft, na.rm = T), 10), col = col[2],
        col.axis = col[2])
    if (!inherits(x, c("Date", "POSIXt")))
        axis(1, pretty(range(x, na.rm = T), 10))
    else {
        if (inherits(x, "POSIXt")) {
            l <- length(x)
            axis(1, at = x[seq(1, l, length = length)],
            labels = format(as.POSIXct(x[seq(1,l, length = length)]),
            format = format))
        }
        else {
            if (inherits(x, "Date")) {
                l <- length(x)
                axis(1, at = x[seq(1, l, length = length)],
                labels = format(as.Date(x[seq(1,l, length = length)]),
                format = format))
            }
            else {
                print("Not suitable x axis")
            }
        }
    }
    if (is.na(yylab[[2]]))
        mtext(deparse(substitute(yleft)), side = 2, line = 2,
            col = col[2], ...)
    else mtext(yylab[[2]], side = 2, line = 2, col = col[2],
        ...)
    if (linky)
        lines(x, yleft, col = col[2], lty = 2, ...)
    if (smooth != 0)
        lines(supsmu(x, yleft, span = smooth), col = col[2],
            lty = 2, lwd = lwds, ...)
  }





> -----Original Message-----
> From: R-help [mailto:r-help-bounces at r-project.org] On Behalf Of Eliza Botto
> Sent: Thursday, November 23, 2017 3:31 PM
> To: r-help at r-project.org
> Subject: [R] adding percentage secondary y-axis
>
> Dear useRs,
>
>
> I have this dataset (D) with three columns.
>
>
> > dput(D)
>
> structure(c(1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20,
> 2.990484802, 3.005018792, 3.019552781, 3.03408677, 3.048620759,
> 3.063154749, 3.077688738, 3.092222727, 3.106756717, 3.121290706,
> 3.135824695, 3.150358684, 3.164892674, 3.179426663, 3.193960652,
> 3.208494642, 3.223028631, 3.23756262, 3.252096609, 3.266630599,
> 0.488381368, 0.976762736, 1.465144104, 1.953525472, 2.44190684,
> 2.930288208, 3.418669576, 3.907050944, 4.395432311, 4.883813679,
> 5.372195047, 5.860576415, 6.348957783, 6.837339151, 7.325720519,
> 7.814101887, 8.302483255, 8.790864623, 9.279245991, 9.767627359), .Dim =
> c(20L, 3L))
>
>
> The first column represents the index values while the second column contains
> the response values. The third column in actually the percentage increase in the
> response values by increasing a unit index value.
>
>
> I made a plot and obtained a single line by;
>
>
> >plot(D[,1],D[,2],type="l")
>
>
> The primary y-axis represents the usual response values. Now I want to add a
> secondary y-axis representing  the percentage value shown against response
> value. So that, when a reader sees the graph she could easily visualize not only
> the decimal response value but also the percentage increase against that
> response value from the secondary axis without plotting any extra line.
>
>
> I thank you in advance,
>
>
> Stay Blessed!!!!
>
>
>
> Eliza
>
>
> UoS
>
>      [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at 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.

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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
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