arrowstyle variable

For plot styles with arrows and with vectors, you can provide an extra column of input data that provides an integer arrow style corresponding to style previously defined using set style arrow.

Example:

     set style arrow 1 head nofilled linecolor "blue" linewidth 0.5
     set style arrow 2 head filled linecolor "red" linewidth 1.0
     # column 5 is expected to contain either 1 or 2,
     # determining which of the two previous defined styles to use
     plot DATA using 1:2:3:4:5 with arrows arrowstyle variable