[ferret_users] plot of differences, what pattern?

[Emilie Vanvyve <vanvyve@xxxxxxxxxxxxxx>]

Hi everyone,

I'm trying to plot as clearly as possible a XY variable ranging between -1 and 1 let's say, by 0.1 step. The variable is a bit messy to the extent negative and positive values are next to each other and no clear separation appears. With a grey scale (no colour allowed this time), it's impossible to see what is negative, what is positive.

I'm wondering whether it'll be possible to plot a "+" symbol for positive values and a "-" symbol for negative values (instead of a filled gridmesh) and to mimic in the same time the pattern tool by changing the colour of the "+" and the "-". The closer the values would be to |1|, the darker the "+" or "-" symbol would be.

I've been playing with palette/pattern combinations, without any real success  so far.

Is it possible to create one's own pattern?

Thanks for any suggestion,

Emilie

______________________________________________________________

Emilie VANVYVE

Physicist, PhD student

Regional climate modelling, Tropical climate

Université catholique de Louvain (UCL)

Institut d'astronomie et de géophysique G. Lemaître (ASTR)

Chemin du Cyclotron, 2, B-1348 Louvain-la-Neuve (Belgium)

Phone: +32 (0)10 473300   Fax: +32 (0)10 474722

E-mail: vanvyve@astr.ucl.ac.be   Web: www.astr.ucl.ac.be/u/vanvyve