How to control lines in the legend?

In the legend there is small line element, but it is very ugly sometimes in case of dashed line. How to control its length?

Answer 1

[dpb]

AFAIK, all you can do is save the object handles (the optional return values) when you create the legend and then set properties of those objects as desired. You're somewhat limited in what handle graphics lets you do to the builtin characteristics of the line styles.

[Mr M.]

In gnuplot, this can be editable.

[dpb]

Matlab isn't gnuplot...