Re: [R] wire.frame tick labels from matrix

From: Deepayan Sarkar <deepayan.sarkar_at_gmail.com>
Date: Fri, 15 Feb 2008 12:41:57 -0800

On 2/15/08, Sundar Dorai-Raj <sundar.dorai-raj_at_pdf.com> wrote:
>
>
> Marlin Keith Cox said the following on 2/15/2008 11:39 AM:
>
> > Dear R Users, close to the end of this I used wireframe to create a 3D plot
> > from a matrix. The x and y axis tick labels (1-6) for each were created
> > from the matrix being a 6X6 matrix. I need the axis tick labels to be the
> > row and column headings which you can see in the output (mat.x). I have
> > tried several work arounds, but they have not been successful.
> >
> > Thanks in advance. keith
> >
> >

> > rm(list=ls())
> > sen<-read.csv("brooktroutsort.csv")
> >
> > #Resistance
> > R=c(660, 548, 676, 763, 768, 692, 657, 630, 748, 680, 786, 645, 710, 677,
> > 692, 732, 737, 651, 396,
> > 601, 640, 448, 464, 472, 434, 487, 495, 426, 429, 456)
> >
> > #Detector length
> > Lend=c(37.0, 39.0, 39.0, 39.0, 40.0, 41.5, 44.0, 45.0, 46.0, 47.0,
> > 47.0, 48.0,
> > 48.5, 49.0, 51.0, 53.0, 53.0, 60.0, 89.0, 103.0, 108.5, 118.0, 118.0,
> > 123.0,
> > 126.0, 138.0, 139.0, 141.0, 141.0, 151.0)
> >
> > #Errors to be multiplied by Restistance
> > x=c(0,.05,.10,.15,.20,.25)
> >
> > #Errors to be multiplied by Detector length
> > y=c(0,.01,.02,.03,.04,.05)
> >
> > #equation to predict water weight in grams
> > a=3.453*((Lend^2)/R)+1.994
> >
> > X=(R%o%x+R)
> >
> > Y=((Lend%o%y+Lend)^2)
> >
> > num.x.col <- length(X[1,])
> > num.y.col <- length(Y[1,])
> > num.rows <- length(X[,1])
> >
> > Z <- matrix(nrow=num.rows, ncol=num.x.col*num.y.col)
> >
> > for( i in 1:num.rows) {
> > Z[i,] <- as.vector( Y[i,] %*% t(X[i,])^-1 )
> > }
> >
> > pred.est <- 3.453*Z+1.994
> > z=(pred.est-a)/a
> >
> > colnames(z)<- rep(c("X1","X2","X3","X4","X5","X6"),6)
> >
> > meanz=colMeans(z)
> > mat.x <- matrix(meanz, nrow=6, ncol=6, byrow=TRUE)
> >
> > colnames(mat.x)<- c(0,1,2,3,4,5)
> > rownames(mat.x)<-c(0,5,10,15,20,25)
> > mat.x
> >
> >
> > library(lattice)
> > wireframe(mat.x,drape=TRUE,zlab=list("Proportion Error of Estimate",
> > rot=90), xlab="Resistance Error (%) ",ylab="Length Error
> > (%)",scale=list(arrows=FALSE))
> > detach(z)
> > detach(sen)
> >
> >
>
>
> Try:
>
> mat.df <- data.frame(z = as.vector(mat.x))
> mat.df$x <- rep(c(0,5,10,15,20,25), each = 6)
> mat.df$y <- rep(c(0,1,2,3,4,5), times = 6)
>
> library(lattice)
> wireframe(z ~ x * y, mat.df,
>
> drape = TRUE,
> zlab = list("Proportion Error of Estimate", rot=90),
> xlab = "Resistance Error (%) ",
> ylab = "Length Error (%)",
>
> scales = list(arrows = FALSE))

A shortcut is

wireframe(mat.x, drape = TRUE, scales = list(arrows = FALSE),

          xlim = rownames(mat.x), ylim = colnames(mat.x))

It probably makes sense to do this automatically for the matrix method.

-Deepayan



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