SURVO MM Help System (web edition)

(in PostScript graphics only)
Points in a scatter plot can be connected by arrows (or line segments)
by giving an ARROWS specification.
Its simplest form is
where A=[a_ij] is an incidence matrix saved as a matrix file and
a_ij=1 means that points of observations i and j are to be connected
and a_ij=0 that points i and j are not to be connected.
It is assumed that when the data set has n observations, A is an
m x n (m<=n) matrix. Thus restrictions by IND, CASES etc. are not permitted.

The general form of ARROWS is
where                                                          default
matrix: incidence matrix (MAT file)                               -
gap:    distance from end points (in plotting units)              0
type:   0=no arrow, 1=end arrow, 2=start arrow, 3=both, 4= <-->   0
           corresponding negative value = filled arrow head
alen:   length of arrow (in plotting units)                      20
angle:  angle (sharpness) of arrow (in radians)                  pi/6

To give a possibility to configure each connection individually
(i.e. variation in line width, type, and color as well as in arrow type),
the non-zero elements can be presented as decimal numbers of form
   a_ij = swww.tacc
where www (one or more digits) is the line width as multiple of
                               0.24 Points, 0.24(Point:mm)=0.084666...,
      t   (one digit)          is index of line type (LINETYPE?),
      a   (one digit)          is arrow type (see previous page),
      cc  (two digits)         is the index of color given by FILL spec.,
      s   (sign)               '-' gives filled arrow head(s).

For example, a_ij=-5.0304 implies an arrow having width 5*0.24=1.2 Points,
solid line type (0), arrow type >---> (3), filled arrow heads (-), and
color (4) specified by FILL(-4)=c,m,y,k  (See PSCOLOR?).

Examples are given in 
and an edit file containing these examples is 

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