matlab (version 1.0.4.1)

imagesc: MATLAB imagesc function

Description

Scales image data to the full range of the current palette and displays the image.

Usage

imagesc(x=seq(ncol(C)), y=seq(nrow(C)), C, col=jet.colors(12), ...)

Arguments

x,y

locations of grid lines at which the values in C are measured. These must be finite, non-missing and in (strictly) ascending order. By default, the dimensions of C are used.

C

numeric matrix representing data to be plotted. Note that x can be used instead of C for convenience.

col

vector of colors used to display image data

...

graphical parameters for image may also be passed as arguments to this method

Author

P. Roebuck

Details

Each element of C corresponds to a rectangular area in the image. The values of the elements of C are indices into the current palette that determine the color of each patch.

The method interprets the matrix data as a table of f(x[i], y[j]) values, so that the x axis corresponds to column number and the y axis to row number, with row 1 at the top, i.e., the same as the conventional printed layout of a matrix.

See Also

image, jet.colors, par

Examples

values <- matrix(c(seq(1,  5, by=1),
                   seq(2, 10, by=2),
                   seq(3, 15, by=3)), nrow=3, byrow=TRUE)
imagesc(values, xlab="cols", ylab="rows", col=jet.colors(16))