Plot a shadow matrix.

plotShadow explores missing values in a matrix by plotting the shadow matrix of the data, in which missing values are coded as black rectangles, and non-missing values are given in light gray.

plotShadow(x, col = gray.colors(2), transpose = FALSE)

Arguments

x	a matrix
col	color palette
transpose	transpose the matrix?

Examples

x<-matrix(1:36,6)
rownames(x)<-paste('row',1:6)
colnames(x)<-paste('column',1:6)
x[2,3:5]<-NA
x[6,6]<-NA
x
#>       column 1 column 2 column 3 column 4 column 5 column 6
#> row 1        1        7       13       19       25       31
#> row 2        2        8       NA       NA       NA       32
#> row 3        3        9       15       21       27       33
#> row 4        4       10       16       22       28       34
#> row 5        5       11       17       23       29       35
#> row 6        6       12       18       24       30       NA
plotShadow(x)