# Display common color scale on multiple scatter3D plots

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## Display common color scale on multiple scatter3D plots

 Dear all, I am trying to display multivariate data using the library plot3D. I have 3 variables that go on the axis and a fourth that I would like to display as a color shade. However, the scale differs between plots because the data I am using varies. Would be possible to maintain a single scale so that the different points will have the same shade on different plots? This would be like giving the same axis scale on different plots. For example, I got the following: >>>> set.seed(50) x = runif(10, 6, 18) y = runif(10,  5,  7) z = runif(10, 0.7, 3.14) k = runif(10, 0.5, 1.2) w = runif(10, min(z, k), max(z,k)) df = my.data <- data.frame(x, y, z, k, w) library("plot3D") X = df\$x Y = df\$y Z = df\$z K = df\$k W = df\$w scatter3D(X, Y, Z, col.var = Z, pch = 16, cex = 2) scatter3D(X, Y, K, col.var = K, pch = 16, cex = 2) <<< In these plots the scale varies (0.6-0.9 in the first plot, 1.5-2.5 in the second); I tried by creating a common scale with the variable W which ranges from the min and max of the fourth levels represented by the variables Z and K, but the result is the same: scatter3D(X, Y, Z, col.var = W, pch = 16, cex = 2) scatter3D(X, Y, K, col.var = W, pch = 16, cex = 2) Essentially, I would like the variables Z and K to be shaded according to a common scale so that I could evaluate the shades of the two plots directly. Would that be possible? Thank you. -- Best regards, Luigi ______________________________________________ [hidden email] mailing list -- To UNSUBSCRIBE and more, see https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide http://www.R-project.org/posting-guide.htmland provide commented, minimal, self-contained, reproducible code.