Lets you create a custom symbolfor marking plotted points.
Vectors containing the x and y vertices of the symbol to be created. In the case of vector-drawn symbols, these vertices are connected, in order, with vectors forming the symbol.If only x is specified, it must be a (2, n) array of vertices, with element (0, i) containing the x-coordinate of the vertex, and element (1, i) containing the y-coordinate.
An integer specifying the color used to draw the symbols, or used to fill the polygon. (Default: the line color)Fill
A flag which, if set, fills the polygon defined by the vertices. If Fill is not set, lines are drawn connecting the vertices.Thick
The thickness of the lines drawn in constructing the symbol. (Default: 1.0)
Symbols may be drawn with vectors or may be filled. Symbols may be of any size and may have up to 50 vertices. To use a user-defined symbol, set the value of the Psym plotting keyword or the !Psym system variable to +8 or -8.
The Psym keyword, in the call to PLOT, is given a value of -8 so that the data points are connected by lines. Also, the Symsize keyword is used with a value of 6 to increase the size of the plotting symbols. This example uses PV-WAVE:IMSL Statistics procedures RANDOMOPT and RANDOM.
x = [0, -0.5, -0.5, 0.5, 0.5, 0] y = [0.5, 0, -1, -1, 0, 0.5]
USERSYM, x, y, /Fill
RANDOMOPT, Set = 12542
pts = RANDOM(6)
PLOT, pts, Psym = -8, Symsize = 6, $
X
Range = [-0.1, 5.1]
Figure 2-127 Scattered data plot with user-defined markers for data points.
Figure 2-128 Scattered data plot with user-defined markers for data points.
Plotting Keywords: Psym and Symsize
