Re: linear trendline

Hi Bahadir,
According to the dtrend_msg documentation, the rightmost dimension of
the input array will be detrended.
http://www.ncl.ucar.edu/Document/Functions/Built-in/dtrend_msg.shtml

To calculate the trend line, you need to use the slope and y_intercept
attributes that are returned from dtrend_msg. For example, looking at
your code, this would work:

trend=dtrend_msg(streamflow&year(34:65),akim,True,True)
data=new((/2,32/),typeof(akim))
data(0,:)=akim
data(1,:)= (ispan(0,31,1)*trend_at_slope)+trend_at_y_intercept

You would then pass data into the gsn_csm_xy plotting routine.
Adam

bahadır altürk wrote:
> Hello
> I have a problem with trendline. I have a simple XY plot graphic and
> would like to add linear trendline on my graphic.How can I draw linear
> trendline? can you help me?
> I attached the my plot,simple excel graphic and my ncl script. I want to
> add like a similar line with excel graphic.
>
>
>
>
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Adam Phillips			             asphilli_at_ucar.edu
National Center for Atmospheric Research   tel: (303) 497-1726
ESSL/CGD/CAS                               fax: (303) 497-1333
P.O. Box 3000				
Boulder, CO 80307-3000	  http://www.cgd.ucar.edu/cas/asphilli
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