有关情节的一般问题

时间:2013-03-15 12:01:05

标签: r plot

使用R,我绘制了一个类似于this的阴影图。我想在R

中执行以下4项操作
  1. 添加图例,如链接所示。
  2. 将x轴名称替换为delta
  3. 的希腊符号
  4. 在图上提到各种交点。例如,在x = 0.75时,一些曲线符合x轴,我想将值0.75放在该点附近。
  5. 如果看到曲线,它们就不平滑了。如何让它们流畅?即使是精益求精的曲线也会更加平滑。
  6. 如何实现这一目标?

    这是情节。

    plot

    以下代码用于绘制图表。

    plot(NA,xlim=c(0,1),ylim=c(0,1),xlab="delta",ylab="K", xaxs="i",yaxs="i") # Empty plot
    a1 <- curve((x+x^7-x^2-x^4)/(1+x-x^3-x^4), from=0, n=450000, add = TRUE) # First curve
    a2 <- curve((x^2+x^3-x-x^5)/(x+x^2), to=0.9, n=45000, add = TRUE)
    a3 <- curve((x+x^7-x^2-x^4)/(1+x-x^2-x^3-x^4+x^7),from=0, n=45000, add = TRUE)
    a4 <- curve((x+x^8-x^3-x^5)/(x+x^8-x^3-x^5+1-x^4),from=0, to=0.9, n=45000, add = TRUE)
    a5 <- curve((x+x^8-x^3-x^5)/(1+x-x^5-x^4),from=0, n=45000, add = TRUE)
    a6 <- curve((x+x^2-x^4-1)/(x-x^4), to=0.84, n=45000, add = TRUE)
    a7 <- curve((x+x^6-x^3-x^4)/(1+x-x^3-x^4), from=0.83 ,to=1,  n=45000, add = TRUE)
    a8 <- curve((1+x^7-x^2-x^4)/(1+x^3-x-x^4), from=0.819, n=45000, add = TRUE)
    a9 <- curve((x)/(1+x), n=45000,from=0.819, to =1, add = TRUE)
    
    
    names(a1) <- c('xA1','yA1')
    names(a2) <- c('xA2','yA2')
    names(a3) <- c('xA3','yA3')
    names(a4) <- c('xA4','yA4')
    names(a5) <- c('xA5','yA5')
    names(a6) <- c('xA6','yA6')
    names(a7) <- c('xA7','yA7')
    names(a8) <- c('xA8','yA8')
    names(a9) <- c('xA9','yA9')
    
    
    with(as.list(c(a1,a2,a3,a4,a5,a6,a7,a8,a9)),{
    
    idA <- yA3 >=0
    idB <- yA2 >=0 & yA2 <= yA4
    idC <- yA4 >= yA2
    
    idD <- yA5 >=0
    
    idE <- yA6 >=0 & yA6 <= yA7
    idF <- yA7 <= yA6
    
    idG <- yA8 >=0 & yA8 <= yA9 
    idH <- xA9 >= xA8 &  xA9 >0.8
    
    idI <- xA1 >=0 & xA1 <= 0.755
    idJ <- xA3 >=0 & xA3 <= 0.755
    
    
    
     polygon(x = c(xA3[idA],xA2[idB],rev(xA4[idC])),
            y = c(yA3[idA],yA2[idB],rev(yA4[idC])), 
            density=20, angle=90, border=NULL)
    
     polygon(x = c(xA5[idD],1,1,0),
            y = c(yA5[idD],0,1,1), 
            density=20, angle=0, border=NULL)
    
     polygon(x = c(xA6,xA7),
            y = c(yA6,yA7), 
            density=20, angle=45, border=NULL)
    
     polygon(x = c(rev(xA8[idG]),xA9[idH],1),
            y = c(rev(yA8[idG]),yA9[idH],0), 
            density=20, angle=135, border=NULL)
    
     polygon(x = c(xA1[idI],rev(xA3[idJ])),
            y = c(yA1[idI],rev(yA3[idJ])), 
            col="black", border=NULL)
    
    
     })
    

2 个答案:

答案 0 :(得分:10)

layout(matrix(c(1,2),nrow=1),
       width=c(4,1)) #Divide your plotting region in two inequal part
par(mar=c(5,4,4,0)) #Get rid of the margin on the right side
plot(NA,xlim=c(0,1),ylim=c(0,1),
     xlab=expression(delta),ylab="K", xaxs="i",yaxs="i") # Here's your delta
a1 <- curve((x+x^7-x^2-x^4)/(1+x-x^3-x^4), from=0, n=450000, add = TRUE)

...

par(mar=c(5,0,4,2)) #No margin on the left side
plot(c(0,1),type="n", axes=F, xlab="", ylab="") #Empty plot
legend("top",legend=c("1","2","3","4","5"), 
       density=c(20,20,20,20,NA), angle=c(90,0,45,135,NA), 
       col=c(NA,NA,NA,NA,"black"), bty="n", cex=1.5)

enter image description here

至于您要标记的点,可以使用函数text(或mtext)来“programmaticaly”或locator以交互方式执行此操作。

编辑:或者(正如我在评论中所说),这也可以将您的传奇放在情节区域之外,并且可能更简单:

par(mar=c(5,4,4,8))
plot(NA,xlim=c(0,1),ylim=c(0,1),
     xlab=expression(delta),ylab="K", xaxs="i",yaxs="i") # Here's your delta
     a1 <- curve((x+x^7-x^2-x^4)/(1+x-x^3-x^4), from=0, n=450000, add = TRUE)

...

legend(1,1,legend=c("1","2","3","4","5"), 
   density=c(20,20,20,20,NA), angle=c(90,0,45,135,NA), 
   col=c(NA,NA,NA,NA,"black"), bty="n", cex=1.5, xpd=TRUE)

答案 1 :(得分:8)

传统的图形系统提供了添加a的legend()函数 传说或情节的关键。图例通常在绘图区域内绘制, 并且相对于用户坐标定位。

该函数有很多参数,在这里我们需要使用 angle 密度参数来区分散列区域。

legend(0.5, 0.8, paste("region", 1:5),
       density=c(20,20,20,20,0),
       angle=c(90,0,45,135,0))

enter image description here