streamline plot with stUseScalarArray = True

dear all,

first, please let me thank the pyngl/ncl developers for their great work!

i would like to plot a streamline plot where the coloring
uses a scalar data array.
for instance i manage to plot the streamline plot with:

plot = Ngl.streamline(wks, u_array, v_array, resources)

and now i would like to color the streamlines according to one vector
component (i.e. the v_array) or another 2d array

i understand that i must specify:

resources.stMonoLineColor = False
resources.stUseScalarArray = True

but how can i specify how/which scalar data array has to be used for the
coloring?

since i don't i get:

warning:StreamlinePlotInitialize: No scalar data: using streamline
magnitude for levelsa
and pyngl colors according to the norm of the vector

the manual indicates: the resource stScalarFieldData is [to be] set with
a valid ScalarField object
i don't know how this can be done in practice and i would be very
grateful for every hint.

best greetings,

radovan
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Received on Tue Sep 04 2007 - 06:48:36 MDT