画温度平流图出错，求大神

zlh

参考了论坛里的帖子，运行程序的时候出现以下的错误，新手一枚，求指导？
'reinit'
'sdfopen E:\dalunwen\20110225\background\uwnd.2011.nc'
'sdfopen E:\dalunwen\20110225\background\vwnd.2011.nc'
'sdfopen E:\dalunwen\20110225\background\air.2011.nc'
'set grads off'
'set grid off'
'set csmooth on'
'set xlopts 1 6 0.15'
'set ylopts 1 6 0.15'
'set font 0'
'set t 219'
'set lev 1000 100'
'set lat 35'
'set lon -110 -70'
'set xlint 5'
'set ylint 100'
'define pi=3.1415726/180.0'
'define vor=hcurl(uwnd,vwnd.2)'
'define r=6.356e6'
'define dtx = cdiff(air.3,x)'
'define dty = cdiff(air.3,y)'
'define dx=cdiff(lon,x)*cos(lat*pi)*pi*r'
'define dy=cdiff(lat,y)*pi*r'
'define advT=-(uwnd*dtx/dx+vwnd.2*dty/dy)'
'set gxout contour'
'set cint 5'
'd advT*1000'

Iree_Aurora

lat的范围也要给定set lat 35 55 试试