Drawing function in R

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There's some function in R could help us to display data:


plot() could be used to draw two vectors

contour()  to create a contour plot

persp() could draw a perspective plot of a surface

image() generate a heat map

abline() draw a line in a plot to help making the data clearly


> weights <- c(300, 200, 100, 250, 150)> prices <- c(9000, 5000, 12000, 7500, 18000)> plot(weights, prices)
<span style="font-family: Arial, Helvetica, sans-serif; background-color: rgb(255, 255, 255);"></span><pre name="code" class="plain"> plot(weights, prices, pch = as.integer(types)) legend("topright", c("gems", "gold", "silver"), pch = 1:3)


There are some attributes in plot() function, which are very important in drawing pictures.

x  assigns the x axis

y assigns the y axis

xlab -- the title of X axis

ylab -- the title of Y axis

col -- the colour of lines -- "red" , "blue",  "black".....

type -- the style of the line

ylim -- the range of Y axis


legend(): Could be used to add legends to a map, illustrating the symbols.

x,y -- the location of legend

legend -- the content of legend

col -- the same as col attribute in plot() function

pch -- the plotting symbols appearing in the legend

lty -- the line types and widths for lines appearing in the legend


Then I will show some demo here. "volcano"  is a data set 87*61, which is a digitized map.

contour(volcano)

 
> persp(volcano)> persp(volcano, expand = 0.2)


"expand" is a expansion factor applied to the z coordinates. Often used with 0 < expand < 1 to shrink the plotting box in the z direction.

> image(volcano)
0 0
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