There is no proper 'z' matrix specified in contour ()
I'm trying to make a simple contour plot of R, but I get the following error: "no proper 'z' matrix specified"
. Below is my code:
r=read.table("test.dat")
dim(r)
## [1] 56 3
x=matrix(unlist(r[,3]),ncol=112,byrow=T)
dim(x)
## [1] 1 11
image((1:nrow(x))-56,(1:ncol(x))-56,x)
contour((1:nrow(x))-56,(1:ncol(x))-56,x , add=TRUE)
## Error in contour.default((1:nrow(x)) - 56,
## (1:ncol(x)) - 56, x, add = TRUE) :
## no proper 'z' matrix specified
Can anyone help me where I am making the mistake.
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1 answer
The code contour.default
(which you can print by typing the function name at the prompt in the R console) contains the line:
if (!is.matrix(z) ||
nrow(z) <= 1L ||
ncol(z) <= 1L)
stop("no proper 'z' matrix specified")
... in other words, contour()
refuses to try to process a matrix that has only one row or only one column. Is this really what you set out to conceive? If so, perhaps you can explain the context in more detail?
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