# add.scatter: Add graphics to an existing plot In ade4: Analysis of Ecological Data: Exploratory and Euclidean Methods in Environmental Sciences

## Description

`add.scatter` is a function which defines a new plot area within an existing plot and displays an additional graphic inside this area. The additional graphic is determined by a function which is the first argument taken by `add.scatter`. It can be used in various ways, for instance to add a screeplot to an ordination scatterplot (`add.scatter.eig`).
The function `add.scatter.eig` uses the following colors: black (represented axes), grey(axes retained in the analysis) and white (others).

## Usage

 ```1 2 3 4``` ```add.scatter(func,posi = c("bottomleft","bottomright","topleft","topright"), ratio = 0.2, inset = 0.01, bg.col = 'white') add.scatter.eig(w, nf = NULL, xax, yax, posi = "bottomleft", ratio = .25, inset = 0.01, sub = "Eigenvalues", csub = 2 * ratio) ```

## Arguments

 `func` an - evaluated - function producing a graphic `posi` a character vector (only its first element being considered) giving the position of the added graph. Possible values are "bottomleft" (="bottom"),"bottomright","topleft" (="top"),"topright", and "none" (no plot). `ratio` the size of the added graph in proportion of the current plot region `inset` the inset from which the graph is drawn, in proportion of the whole plot region. Can be a vector of length 2, giving the inset in x and y. If atomic, same inset is used in x and y `bg.col` the color of the background of the added graph `w` numeric vector of eigenvalues `nf` the number of retained factors, NULL if not provided `xax` first represented axis `yax` second represented axis `sub` title of the screeplot `csub` size of the screeplot title

## Details

`add.scatter` uses `par("plt")` to redefine the new plot region. As stated in `par` documentation, this produces to (sometimes surprising) interactions with other parameters such as "mar". In particular, such interactions are likely to reset the plot region by default which would cause the additional graphic to take the whole plot region. To avoid such inconvenient, add ```par([other options], plt=par("plt"))``` when using `par` in your graphical function (argument `func`).

## Value

The matched call (invisible).

## Author(s)

Thibaut Jombart t.jombart@imperial.ac.uk

`scatter`

## Examples

 ``` 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66``` ``` data(microsatt) w <- dudi.coa(data.frame(t(microsatt\$tab)), scann = FALSE, nf = 3) if(adegraphicsLoaded()) { a1 <- rnorm(100) b1 <- s1d.barchart(sort(a1), p1d.horizontal = FALSE, plot = FALSE) h1 <- s1d.hist(a1, pgrid.draw = FALSE, porigin.draw = FALSE, pbackground.col = "grey", plot = FALSE, ppoly.col = "white", ppoly.alpha = 1) g1 <- insert(h1, b1, posi = "topleft", plot = FALSE) a2 <- rnorm(100) b2 <- s1d.barchart(sort(a2), p1d.horizontal = FALSE, plot = FALSE) h2 <- s1d.hist(a2, pgrid.draw = FALSE, porigin.draw = FALSE, pbackground.col = "grey", plot = FALSE, ppoly.col = "white", ppoly.alpha = 1) g2 <- insert(h2, b2, posi = "topleft", inset = c(0.25, 0.01), plot = FALSE) a3 <- rnorm(100) b3 <- s1d.barchart(sort(a3), p1d.horizontal = FALSE, plot = FALSE) h3 <- s1d.hist(a3, pgrid.draw = FALSE, porigin.draw = FALSE, pbackground.col = "grey", plot = FALSE, ppoly.col = "white", ppoly.alpha = 1) g3 <- insert(h3, b3, posi = "bottomleft", inset = 0.4, ratio = 0.2, plot = FALSE) a4 <- rnorm(100) b4 <- s1d.barchart(sort(a4), p1d.horizontal = FALSE, plot = FALSE) h4 <- s1d.hist(a4, pgrid.draw = FALSE, porigin.draw = FALSE, pbackground.col = "grey", plot = FALSE, ppoly.col = "white", ppoly.alpha = 1) g4 <- insert(h3, b3, posi = "bottomright", ratio = 0.3, plot = FALSE) G1 <- ADEgS(list(g1, g2, g3, g4), layout = c(2, 2), plot = TRUE) g5 <- s.label(w\$co, plot = FALSE) g6 <- plotEig(w\$eig, w\$nf, psub = list(text = "Eigenvalues"), pbackground = list(box = TRUE), plot = FALSE) G2 <- insert(g6, g5, posi = "bottomright", ratio = 0.25) } else { par(mfrow=c(2,2)) f1 <- function(a){ opar=par("mar","xaxt","yaxt","plt") on.exit(par(opar)) par(mar=rep(.1,4),xaxt="n",yaxt="n",plt=par("plt")) hist(a,xlab="",ylab="",main="",col="white",proba=TRUE) lines(seq(-4,4,le=50),dnorm(seq(-4,4,le=50)),col="red") } a <- rnorm(100) barplot(sort(a)) add.scatter(f1(a),posi="topleft",bg.col="grey") a <- rnorm(100) barplot(sort(a)) add.scatter(f1(a),posi="topleft",bg.col="grey",inset=c(.25,.01)) a <- rnorm(100) barplot(sort(a)) add.scatter(f1(a),posi="topleft",bg.col="grey",inset=.25,ratio=.1) a <- rnorm(100) barplot(sort(a)) add.scatter(f1(a),posi="bottomright",bg.col="grey",ratio=.3) par(mfrow=c(1,1)) s.label(w\$co) add.scatter.eig(w\$eig,w\$nf,posi="bottomright",1,2) } ```

### Example output  ```
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ade4 documentation built on June 17, 2021, 5:14 p.m.