如何获得适合数字的色阶?最高点是2000,在这种情况下应为蓝色,但较高的值为红色,应为较低的数字。下面是一个示例数据框和代码。
test <- data.frame(a = c(10,20,15,30,45,40,20,30,25,30,10,40,10,20,15),
b = c(5,10,5,15,10,20,20,15,10,5,15,20,5,10,5),
c = c(500, 1000,1250, 750,575,200,800,2000,1500,1750,250,750,1000,800,500))
plot_ly(data = test,
x = ~a,
y = ~b,
z = ~c,
intensity = seq(0,2000, length = 8),
colorscale = list(c(0,'rgb(255,0,0)'),
c(0.5, 'rgb(0,255,0)'),
c(1, 'rgb(0,0,255)')),
type = 'mesh3d')
理想情况下,色阶会更加具体,其中0-500是红色,501-1000是橙色,1001-1500是黄色,1501-2000将是绿色(而不是刻度)。