Arrows

The 2D arrows style draws an arrow with specified length and orientation angle at each point (x,y). Additional input columns may be used to provide variable (per-datapoint) color information or arrow style. It is identical to the 2D style with vectors except that each the arrow head is positioned using length + angle rather than delta_x + delta_y. See with vectors (p. ).

    4 columns:  x  y  length  angle

The keywords with arrows may be followed by inline arrow style properties, a reference to a predefined arrow style, or arrowstyle variable to load the index of the desired arrow style for each arrow from a separate column.

length 5#5 0 is interpreted in x-axis coordinates. -1 4#4 length 4#4 0 is interpreted in horizontal graph coordinates; i.e. 3#3length3#3 is a fraction of the total graph width. The program will adjust for differences in x and y scaling or plot aspect ratio so that the visual length is independent of the orientation angle.

angle is always specified in degrees.