R Language Basics Learning (iv): The Paint function--plot () function in R

The plot () function is a function of the basic X-y two variables in R, which is used as follows: Plot (x, Y, ...)

For example: First I use the runif () function to produce two columns of random numbers: x1,y1, and then draw directly with the plot () function:

> X1 <-Round (runif (20,min = 0, max = 100))
> x1
[1] 90 84 86 86 28 43 86 76 90 76 14 62 40 52 87 57 88 17
[19] 10 27
> Y1 <-Round (runif (20,min = 0, max = 100))
> y1
[1] 23 91 75 72 4 60 23 50 74 92 55 56 21 86 71 86 84 47
[19] 4 79
> Plot (x1,y1)

This is the default paint style for the plot () function. You can add additional parameters to change the style of the diagram.

Cases:

> Plot (x1,y1,main = "I am the title", Xlab = "I am the x axis", Ylab = "I am the y axis", Xlim = C (0,100), Ylim = C (0,100), col = "Red", PCH = 19)

The illustrations are:

Parameter description:

Main: Title

Xlab,ylab:x,y Axis Description

Scale limits for xlim,ylim:x,y axes

Col: The color of the stroke

PCH: The style of the stroke, the 19 code is a solid dot, can also be replaced by other codes.

The above is a scatter plot with the plot () function, and the plot () function can also draw a line chart, for example:

> x <-C (1:10)
> y <-Round (runif (10,min = x, max = 100))
> Plot (x,y,type = ' l ', Ylim = C (60,100))

X is 1-10 10 digits, Y is the score of 10 exams, you can draw a line chart of these 10 test scores:

The plot () function can also draw multiple line graphs with the lines () function:

> x <-1:10
> Beijing <-Round (rnorm (10,mean = $, SD = 2), 1)
> Shanghai <-Round (rnorm (10,mean = $, SD = 3), 1)
> Guangzhou <-Round (rnorm (10,mean = $, SD = 1), 1)

> Plot (x,beijing,type = ' l ', Ylim = C (16,30), LWD = 2,main = "Temperature change trend in Beijing, Shanghai and Guangzhou for the last 10 days")
> lines (x,shanghai,type = ' l ', col = ' Blue ', LWD = 2)
> lines (x,guangzhou,type = ' l ', col = ' red ', LWD = 2)

Note: the lines () function must be used in conjunction with the plot () function to draw a graph with the plot () function and then add the lines () function to the other lines.

Learn here today, and then next week to learn

R Language Basics Learning (iv): The Paint function--plot () function in R