3d 散点图中的 R plotly 平面

Question

我正在尝试向 this plot 添加一个平面（请原谅尺寸，如果我把它变大则文件太大）。该表面应与地面平行，第三维等于零。它应该通过红点。

重现代码：

n.cases <- 240              
n.vars <- 4                
set.seed(26)               
eps <- rnorm(n.vars, 0, 1/4)
x <- matrix(rnorm(n.cases * (n.vars+2)), nrow=n.cases)
beta <- rbind(c(1,rep(0, n.vars)), c(0,rep(1, n.vars)), cbind(rep(0,n.vars), diag(eps)))
y <- x%*%beta             

data <- data.frame(y)
data.1.2 <- data[,1:2]
data.1.2$X3 <- integer(nrow(data.1.2))

data.1.2$group = 'First Iteration'

data.1.3 <- data[,1:3]
data.1.3$group = 'Second Iteration'

newdf <- rbind(data.1.2, data.1.3)

library(plotly)

plot_ly(x=newdf$X1, y=newdf$X2, z=newdf$X3, color = newdf$group, colors = c('#BF382A', '#0C4B8E')) %>%
  add_markers() %>%
  layout(scene = list(xaxis = list(title = 'First Dimension'),
                      yaxis = list(title = 'Second Dimension'),
                      zaxis = list(title = 'Third Dimension'),
                      bgcolor = "rgb(244, 244, 248)"))

我尝试使用 add_surface，但到目前为止没有成功。我不明白函数需要什么样的矩阵。我试过

matrix <- cbind(c(-5,-4,-3,-2,-1,0,1,2,3,4,5), c(-5,-4,-3,-2,-1,0,1,2,3,4,5), c(0,0,0,0,0,0,0,0,0,0,0))

然后通过

添加曲面

%>%  add_surface(z=~matrix2)

但这确实以

结束

Error in traces[[i]][[obj]] : 
 attempt to select less than one element in get1index

我想我还不明白矩阵的样子。

谢谢！

Answer 1

我想你正在寻找这样的东西：

matrix2 <- c(
  c(0,0,0,0),
  c(0,0,0,0),
  c(0,0,0,0),
  c(0,0,0,0)
)
dim(matrix2) <- c(4,4)

y <- c(-2,-1,0,1)
x <- c(-2,-1,0,1)
rownames(matrix2) <- x
colnames(matrix2) <- y


plot_ly() %>%
  add_markers(data = newdf, x=~X1, y=~X2, z=~X3, color = ~group, colors = c('#BF382A', '#0C4B8E')) %>%
  layout(scene = list(xaxis = list(title = 'First Dimension'),
                      yaxis = list(title = 'Second Dimension'),
                      zaxis = list(title = 'Third Dimension'),
                      bgcolor = "rgb(244, 244, 248)")) %>%  add_surface(z=~matrix2, x = ~x, y= ~y)

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