Gnuplot pm3d: 'NaN value' removes all surrounding rectangles
问题 I would like to plot a pm3d map, where data points are not equidistant on the axis. Since the spacings for the x and y axis are identical, it is symmetrical, though. The problem is whenever a value is "NaN", all of the four surrounding rectangles are not plotted. In the data file below, this happens, for example, at (x,y)=(0.14,0.33) . If the value is not 'NaN', then the four rectangles reappear. I discovered this problem, when I tried to plot only the values >0 or <0, where the same happens.