s.chull | R Documentation |

performs the scatter diagrams with polygons of contour by level of a factor.

s.chull(dfxy, fac, xax = 1, yax = 2, optchull = c(0.25, 0.5, 0.75, 1), label = levels(fac), clabel = 1, cpoint = 0, col = rep(1, length(levels(fac))), xlim = NULL, ylim = NULL, grid = TRUE, addaxes = TRUE, origin = c(0,0), include.origin = TRUE, sub = "", csub = 1, possub = "bottomleft", cgrid = 1, pixmap = NULL, contour = NULL, area = NULL, add.plot = FALSE)

`dfxy` |
a data frame containing the two columns for the axes |

`fac` |
a factor partioning the rows of the data frame in classes |

`xax` |
the column number of x in |

`yax` |
the column number of y in |

`optchull` |
the number of convex hulls and their interval |

`label` |
a vector of strings of characters for the point labels |

`clabel` |
if not NULL, a character size for the labels, used with |

`cpoint` |
a character size for plotting the points, used with |

`col` |
a vector of colors used to draw each class in a different color |

`xlim` |
the ranges to be encompassed by the x axis, if NULL, they are computed |

`ylim` |
the ranges to be encompassed by the y axis, if NULL they are computed |

`grid` |
a logical value indicating whether a grid in the background of the plot should be drawn |

`addaxes` |
a logical value indicating whether the axes should be plotted |

`origin` |
the fixed point in the graph space, for example c(0,0) the origin axes |

`include.origin` |
a logical value indicating whether the point "origin" should be belonged to the graph space |

`sub` |
a string of characters to be inserted as legend |

`csub` |
a character size for the legend, used with |

`possub` |
a string of characters indicating the sub-title position ("topleft", "topright", "bottomleft", "bottomright") |

`cgrid` |
a character size, parameter used with par("cex")* |

`pixmap` |
an object 'pixmap' displayed in the map background |

`contour` |
a data frame with 4 columns to plot the contour of the map : each row gives a segment (x1,y1,x2,y2) |

`area` |
a data frame of class 'area' to plot a set of surface units in contour |

`add.plot` |
if TRUE uses the current graphics window |

The matched call.

Daniel Chessel

xy <- cbind.data.frame(x = runif(200,-1,1), y = runif(200,-1,1)) posi <- factor(xy$x > 0) : factor(xy$y > 0) coul <- c("black", "red", "green", "blue") if(adegraphicsLoaded()) { s.class(xy, posi, ppoi.cex = 1.5, chullSize = c(0.25, 0.5, 0.75, 1), ellipseSize = 0, starSize = 0, ppoly = list(col = "white", border = coul)) } else { s.chull(xy, posi, cpoi = 1.5, col = coul) }

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