The GPOINT subroutine is a graphical call that draws symbols at specified locations.
The required arguments to the GPOINT subroutine are as follows:
- x
-
is a vector that contains the horizontal coordinates of points.
- y
-
is a vector that contains the vertical coordinates of points.
The optional arguments to the GPOINT subroutine are as follows:
- symbol
-
is a character vector or quoted literal that specifies a valid plotting symbol or symbols.
- color
-
is a valid SAS color, where color can be specified as a quoted text string (such as 'RED'), the name of a character matrix that contains a valid color as an element, or a color number (such as 1) that refers to a color in the color list.
- height
-
is a numeric matrix or literal that specifies the character height.
- window
-
is a numeric matrix or literal that specifies a window. This is given in world coordinates and has the form
{minimum-x minimum-y maximum-x maximum-y}
- viewport
-
is a numeric matrix or literal that specifies a viewport. This is given in normalized coordinates and has the same form as the window argument.
The GPOINT subroutine marks one or more points with symbols. The x and y vectors define the locations of the markers. The symbol and color arguments can have from one to as many elements as there are well-defined points. The coordinates in use for this graphics command are world coordinates.
The following example plots the curve 
for 
:
call gstart; x = 0:100; y = 50 + 25*sin(x/10); call gpoint(x, y); call gshow;
The following example uses the GPOINT subroutine to plot symbols at specific locations on the screen:
marker = {a b c d e '@' '#' '$' '%' '^' '&' '*' '-' '+' '='};
x = 5*(1:ncol(marker));
y = x;
call gpoint(x, y, marker);
call gshow;
See Chapter 15 for further examples that use the GPOINT subroutine.