Graphical parameters

Question 1

adj

Answer 1

controls text justification (0 left-justified, 0.5 centred, 1 right-justified)

Question 2

bg

Answer 2

specifies the colour of the background (ex. : bg=”red”, bg=”blue”, . . .
the list of the 657 available colours is displayed with colors())

Question 3

bty

Answer 3

controls the type of box drawn around the plot, allowed values are: “o”, “l”, “7”, “c”, “u” ou “]” (the box looks like the corresponding char-
acter); if bty=”n” the box is not drawn

Question 4

cex

Answer 4

a value controlling the size of texts and symbols with respect to the de-
fault; the following parameters have the same control for numbers on the axes, cex.axis, the axis labels, cex.lab, the title, cex.main, and the sub-title, cex.sub

Question 5

col

Answer 5

controls the color of symbols and lines; use color names: “red”, “blue” see colors() or as “#RRGGBB”; see rgb(), hsv(), gray(), and rainbow(); as for cex there are: col.axis, col.lab, col.main, col.sub

Question 6

font

Answer 6

an integer which controls the style of text (1: normal, 2: italics, 3: bold, 4: bold italics); as for cex there are: font.axis, font.lab, font.main, font.sub

Question 7

las

Answer 7

an integer which controls the orientation of the axis labels (0: parallel to the axes, 1: horizontal, 2: perpendicular to the axes, 3: vertical)

Question 8

lty

Answer 8

controls the type of lines, can be an integer or string (1: “solid”, 2: “dashed”, 3: “dotted”, 4: “dotdash”, 5: “longdash”, 6: “twodash”, or a string of up to eight characters (between “0” and “9”) which specifies alternatively the length, in points or pixels, of the drawn elements and the blanks, for example lty=”44” will have the same effect than lty=2

Question 9

lwd

Answer 9

a numeric which controls the width of lines, default 1

Question 10

mar

Answer 10

a vector of 4 numeric values which control the space between the axes and the border of the graph of the form c(bottom, left, top,
right), the default values are c(5.1, 4.1, 4.1, 2.1)

Question 11

mfcol

Answer 11

a vector of the form c(nr,nc) which partitions the graphic window as a matrix of nr lines and nc columns, the plots are then drawn in
columns

Question 12

mfrow

Answer 12

id. but the plots are drawn by row

Question 13

pch

Answer 13

controls the type of symbol, either an integer between 1 and 25, or any
single character within “”

Question 14

ps

Answer 14

an integer which controls the size in points of texts and symbols

Question 15

pty

Answer 15

a character which specifies the type of the plotting region, “s”: square, “m”: maximal

Question 16

tck

Answer 16

a value which specifies the length of tick-marks on the axes as a fraction of the smallest of the width or height of the plot; if tck=1 a grid is drawn

Question 17

tcl

Answer 17

a value which specifies the length of tick-marks on the axes as a fraction of the height of a line of text (by default tcl=-0.5)

Question 18

xaxt

Answer 18

if xaxt=”n” the x-axis is set but not drawn (useful in conjonction with axis(side=1, …))

Question 19

yaxt

Answer 19

if yaxt=”n” the y-axis is set but not drawn (useful in conjonction with axis(side=2, …))