如何从矩阵生成R中的等高线图 [英] How to produce contour plot in R from matrix

问题描述

我有一个文件，其中包含nxn个数字值矩阵，并且标题行和列包含标签.

I have a file containing an nxn matrix of numeric values with a header row and column containing labels.

我想用R(2.14.x)生成值的等高线图，因此我像这样加载矩阵:

I want to produce a contour plot of the values with R (2.14.x) so I am loading in the matrix like so:

mat <- as.matrix(read.table("myfile", row.names=1, sep=",", header=TRUE))

，然后尝试通过以下方式生成等高线图:

and then attempting to produce a contour plot by:

contour(rownames(mat), colnames(mat), mat)

但是我得到了错误:

Error in r[i1] - r[-length(r):-(length(r) - lag + 1L)] : 
  non-numeric argument to binary operator

产生问题的示例矩阵包含:

An example matrix that produces the problem contains:

,1,2,3
1,827786,672544,622597
2,674201,651413,533766
3,626531,533179,489844

出了什么问题，我该如何解决? 我是R的新手，所以我可能在这里做一些愚蠢的事情.任何帮助表示赞赏.

What's going wrong and how do I fix it? I'm very new to R so I might be doing something stupid here. Any help appreciated.

推荐答案

D'oh.一定是在途中误读了一些文档-contour(mat)正常工作.

D'oh. Must've misread some documentation on the way - contour(mat) works fine.

我从 http://wiki.cbr.washington之类的文档中想到.edu/qerm/index.php/R/Contour_Plots ，我需要将x，y，z分开.

I thought from docs like http://wiki.cbr.washington.edu/qerm/index.php/R/Contour_Plots that I needed to split out the x,y,z.

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