[gradsusr] A Faulty IF Loop

[Noska, Ryne]

I have written a very simple code for the purpose of creating one image with sixteen figures (four rows and four columns). Unfortunately, the loop I have designed to change the location of the next figure is broken. Instead of only executing the "if" statement if lag = 1 or 5 or 9 or 13, this portion of the loop is ALWAYS executed. The "else" statement is NEVER executed, causing the figures to run off the page after figure 4 since only ymin and ymax change. Below is a portion of my code; again, the problematic portion is the IF loop:

---------------------------------------

xmin = 0.25
xmax = 2.50
ymin = 6.25 + 2.00
ymax = 8.00 + 2.00

lag = 1
while (lag <= 16)
  numlag = lag - 1

  if (lag = 1 | 5 | 9 | 13)
    xmin = 0.25
    xmax = 2.50
    ymin = ymin - 2.00
    ymax = ymax - 2.00
  else
    xmin = xmin + 2.50
    xmax = xmax + 2.50
  endif

  xlab = ((xmax - xmin)/2) + 0.25
  ylab = ymax + 0.125

  'set parea 'xmin' 'xmax' 'ymin' 'ymax
  'set xlopts 1 1 0.10'
  'set ylopts 1 1 0.10'
  'set xlint 10'
  'set ylint 10'
  'set xlab off'
  'set ylab off'
  'set grid on'
  'set grads off'
  'set map 1 1 5'
  'set clevs -0.8 -0.7 -0.6 -0.5 -0.4 -0.3 -0.2 -0.1 0.1 0.2 0.3'
  'set ccols 9   14   4    11   5   13    3    10   0   7  12  8'
  'set t 'lag
  'd corr_grdons'
  'set strsiz 0.15'
  'set string 1 c 8'
  'draw string 'xlab' 'ylab' lag='numlag'days'

  lag = lag + 1
endwhile

-------------------------------

Any suggestions?

Thank you,
Ryne

?

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