From: Rosemarie Drummond <rmarie_at_nyahnyahspammersnyahnyah>

Date: Tue, 07 Aug 2007 12:09:29 -0300

Date: Tue, 07 Aug 2007 12:09:29 -0300

I want to plot 40 irregularly-spaced vectors on a map of N America.

I would be happy to plot them one at a time if I could find a routine to

do that but all the routines I have found (eg gsn_csm_vector_map) want

data on a lat-lon array with a minimum length of 3 in each direction, so

I tried setting up a 2-D array of data, with zero magnitude except where

I want the arrows.

I split it up into sets of 4 and after much trial, I got 5 sets to plot

ie 20 of the vectors.

It keeps giving me errors

" warning:_NhlCreateSplineCoordApprox: Attempt to create spline

approximation for X axis failed: consider adjusting trXTensionF value

warning:_NhlCreateSplineCoordApprox: Attempt to create spline

approximation for Y axis failed: consider adjusting trYTensionF value

warning:IrTransInitialize: error creating spline approximation for

trXCoordPoints; defaulting to linear

warning:IrTransInitialize: error creating spline approximation for

trYCoordPoints; defaulting to linear"

I have seen that other people have asked the same sort of question on

ncl-talk but apart from a suggestion to try changing the values of

trXTensionF and trYTensionF (I tried both large and small values) or

plotting subsets of the data (which I tried as I mentioned above), I

have not found a helpful answer.

Any suggestions appreciated!

Rosemarie Drummond

-- Dr Rosemarie Drummond rmarie_at_atmosp.physics.utoronto.ca _______________________________________________ ncl-talk mailing list ncl-talk_at_ucar.edu http://mailman.ucar.edu/mailman/listinfo/ncl-talkReceived on Tue Aug 07 2007 - 09:09:29 MDT

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