heatmap {aCGH}R Documentation

Creates heatmap array CGH objects


Clusters samples and produces heatmapp of the observed log2ratios.


heatmap(x, imp = TRUE, Rowv = NA, Colv = NULL, distfun = dist,
        hclustfun = hclust, add.expr, symm = FALSE,
        revC = identical(Colv, "Rowv"), scale = "none",
        na.rm = TRUE, margins = c(5, 5), ColSideColors,
        RowSideColors, cexRow = 0.2 + 1 / log10(nr),
        cexCol = 0.2 + 1 / log10(nc), labRow = NULL,
        labCol = NULL, main = NULL, xlab = NULL, ylab = NULL,
        verbose = getOption("verbose"), methodR = "ward",
        methodC = "ward", zlm = c(-0.5, 0.5), ...)


x object of the aCGH object
imp logical variable indicating whether log2.ratios.imputed or log2.ratios slot of aCGH should be used. Defaults to imputed value (TRUE).
Rowv determines if and how the row dendrogram should be computed and reordered. Either a 'dendrogram' or a vector of values used to reorder the row dendrogram or 'NA' to suppress any row dendrogram (and reordering) or by default, 'NULL'
Colv determines if and how the column dendrogram should be reordered. Has the same options as the Rowv argument above and additionally when x is a square matrix, Colv = "Rowv" means that columns should be treated identically to the rows.
distfun function used to compute the distance (dissimilarity) between both rows and columns. Defaults to 'dist'.
hclustfun function used to compute the hierarchical clustering when 'Rowv' or 'Colv' are not dendrograms. Defaults to 'hclust'
add.expr expression that will be evaluated after the call to 'image'. Can be used to add components to the plot.
symm logical indicating if 'x' should be treated *symm*etrically; can only be true when 'x' is a square matrix.
revC logical indicating if the column order should be 'rev'ersed for plotting, such that e.g., for the symmetric case, the symmetry axis is as usual.
scale character indicating if the values should be centered and scaled in either the row direction or the column direction, or none. The default is "row" if symm false, and "none" otherwise.
na.rm logical indicating whether 'NA''s should be removed.
margins numeric vector of length 2 containing the margins (see 'par(mar= *)') for column and row names, respectively.
ColSideColors (optional) character vector of length 'ncol(x)' containing the color names for a horizontal side bar that may be used to annotate the columns of 'x'.
RowSideColors (optional) character vector of length 'nrow(x)' containing the color names for a vertical side bar that may be used to annotate the rows of 'x'.
cexRow, cexCol positive numbers, used as 'cex.axis' in for the row or column axis labeling. The defaults currently only use number of rows or columns, respectively.
labRow, labCol character vectors with row and column labels to use; these default to 'rownames(x)' or 'colnames(x)', respectively.
main, xlab, ylab main, x- and y-axis titles;
verbose logical indicating if information should be printed.
methodR method to use for clustering rows. defaults to "ward"
methodC method to use for clustering columns. defaults to "ward"
zlm all the values greater or equal than zlm are set to zlm - 0.01. a;; value less or equal to -zlm are set to -zlm + 0.01
... additional arguments passed on to 'image', e.g., 'col' specifying the colors.


This function is almost identical to the heatmap in base R. The slight modifications are that (1) a user can specify clustering method for rows and columns; (2) all the values outside specified limits are floored to be 0.01 less than a limit; (3) default values are different. Note that using default option of imp (TRUE) produces nicer looking plots as all missing values are removed.


Invisibly, a list with components

crowInd row index permutation vector as returned by order.dendrogram
colInd row index permutation vector as returned by order.dendrogram


heatmap function in base R

See Also

aCGH clusterGenome


#default plotting method for the aCGH object

#to produce smoother looking heatmap, use imp = T: this will use imputed
#slot of aCGH object

plot(colorectal, imp = TRUE)

[Package aCGH version 1.1.4 Index]