image_irreg {tagtools}

Plot an image with an irregular grid.

Description

This function is used to plot an image with an irregular grid. This is useful for plotting matrix data (i.e., sampled data that is a function of two parameters) in which one or both of the sampling schemes is not regularly spaced. image_irreg plots R(i,j) as a coloured patch centered on x(i), y(j) and with dimension determined by x[i] - x[i-1] and y[i] - y[i-1].

Usage

image_irreg(x, y, R)

Arguments

x

is a vector with the horizontal axis coordinates of each value in R.

y

is a vector with the vertical axis coordinates of each value in R.

R

is a matrix of measurements to display. The values in R are converted to colours in the current colormap and caxis. R must be length(x) by length(y). Use NaN to have a patch not display.

Value

an image plot on an irregular grid