HTML.cormat {R2HTML}R Documentation

Write a correlation matrix with HTML formatting


Although the class ‘cormat’ is not defined, the function is called to HTML.cormat, to highlight the fact it should be called only with a correlation matrix.


HTML.cormat(x, file = .HTML.file, digits = 2, append = TRUE, align = "center", caption = "", captionalign = "bottom", classcaption = "captiondataframe", classtable = "cormat", useCSS = TRUE, ...)


x a correlation matrix
file target HTLM output
digits number of digits to use for rounding
append logical. If 'TRUE' output will be appended to 'file'; otherwise, it will overwrite the contents of 'file'
align alignment to be used: center, left or right
caption optional caption to append to the table
captionalign alignment to be used for the caption: could be bottom or top
classcaption CSS class to use for caption
classtable CSS class to be used for the whole table (in html <table> statement)
useCSS whether to use CSS or not for traffic highlighting
... ...


returns (invisibly) the input


“Highlighting traffic” is a simple technique which allows to have a visual representation of data. It is particularly well suited for correlation matrices in order to have at a glance the underlying (linear) structure of data. If your output doesn't rely on CSS styles, you should use useCSS=FALSE option, whihc hard codes grey levels for correlations.

For CSS uses, you can (re)define colours and other attributes for correlations in seq(0,1,length=11)-defined intervals. Some definitions could be equivalent, not showing any difference. You can, by example, redefine CSS so that only correlations greater than 0.9 are showned, and lower the size of cells, which could be usefull for veryu big datasets.


Eric Lecoutre

See Also



        HTML(as.title("Fisher Iris dataset / Correlation matrix - normal matrix"),file=tmpfic)
        HTML(cor(iris[,1:4]), file=tmpfic)
        HTML(as.title("Fisher Iris dataset / Correlation matrix - traffic highlighting"),file=tmpfic)
        HTML.cormat(cor(iris[,1:4]), file=tmpfic)

        # File is generated, you can call the browser:
        ## Not run: browseURL(tmpfic)

[Package R2HTML version 1.4-3 Index]