[ncl-talk] how to print the string of plus-minus sign on the figure with NCL

[WUJIE]

Hi NCL experts,

Typically I use "gsn_text_ndc" to show some statistic metrics on the XY Plots, which is easy to do. However, for uncertainty purpose, one may need show " plus-minus sign” between two numbers. Does anyone can help how can I show the "plus-minus sign" with NCL? 


I have tried this to make a "plus-minus sign", which is learned from here: http://www.ncl.ucar.edu/Document/Functions/Built-in/NhlNewMarker.shtml 


;-----------------------------------------
   mstring_tem = "1"
   fontnum_tem = 34
   xoffset_tem = 0.0
   yoffset_tem = 0.0
   ratio_tem   = 1.0
   size_tem    = 1.0
   angle_tem   = 0.0
   plus_minus_sign = NhlNewMarker(wks, mstring_tem, fontnum_tem, xoffset_tem, yoffset_tem, ratio_tem, size_tem, angle_tem)

;-----------------------------------------


I then learned that "plus_minus_sign" created by above lines is a number instead of a string, so below line cannot work :


 gsn_text_ndc(wks,"Slope = " + sprintf("%3.2f", rc)+plus_minus_sign+sprintf("%3.2f",std)






How can I transfer it to a string?


Thanks, 


Jie
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