[gradsusr] Contour levels are not strictly increasing

[Jim Weber]

Hi,

I have a script which I have inherited that worked until all the https changes with NOAA.  That forced me to upgrade to a version of grads that could connect to a https server. Once I did this and corrected this problem I developed another issue. When my scripts run I get the following error.

Warning: Contour levels are not strictly increasing
         This may lead to errors or undesired results

I have narrowed it down to these two lines that if I remove them I do not get the error (but also do not get the contours with as many levels)

'set ccols 'cols
'set clevs 'levs

Further up in the script it has a while loop to set all the colors and also to set the cols and levs(see below). Does anyone have a suggestion on what is wrong that the above commands generate this error and how I might correct this?

* set the contour levels
nlevs=239
l=1
levs=''
val=min
delta=(max-min)/nlevs
while(l<=nlevs)
val=min + l*delta
fmt="%3.1f"
fval = math_format(fmt,val)
levs=levs' 'fval
l=l+1
endwhile

* set the contour colors
c=255
cols=''
while (c>15)
  cols=cols' 'c
  c=c-1
endwhile

* define the colors
delta=4
base=15
c=16
blksz=60
while (c<=255)

* block 1: Red to Yellow
  rval=255
  bval=base
  i=0
  while (i<blksz)
    gval=base + (i*delta)
    'set rgb 'c' 'rval' 'gval' 'bval
    i=i+1
    c=c+1
  endwhile

* block 2: Yellow to Green
  gval=255
  bval=base
  i=0
  while (i<blksz)
    rval=255 - (i*delta)
    'set rgb 'c' 'rval' 'gval' 'bval
    i=i+1
    c=c+1
  endwhile

* block 3: Green to Cyan
  rval=base
  gval=255
  i=0
  while (i<blksz)
    bval=base + (i*delta)
    'set rgb 'c' 'rval' 'gval' 'bval
    i=i+1
    c=c+1
  endwhile

* block 4: Cyan to Blue
  rval=base
  bval=220
  i=0
  while (i<blksz)
    gval=255 - (i*delta)
    'set rgb 'c' 'rval' 'gval' 'bval
    i=i+1
    c=c+1
  endwhile


Jim Weber
jim.weber at foxtv.com<mailto:jim.weber at foxtv.com>

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