IDL> ;生成5个元素的[0,1]范围内随机数组，注意undefinevar是个未定义变量

IDL> print,randomu(undefinevar,5)

     0.758868    0.0292860     0.425083     0.375357     0.288495

IDL> ;生成4*5的[0,1]范围内随机数组

IDL> print,randomu(undefinevar,5,4)

     0.344222     0.732798     0.209895     0.307210     0.534765

     0.214072     0.439286     0.681666    0.0401281     0.442817

    0.0882233     0.369515     0.800266     0.431608    0.0122711

     0.992980     0.564629     0.920463     0.850796     0.331296

IDL> ;生成2*3的[0,100]范围内浮点随机数组

IDL> print,randomu(undefinevar,3,2)*100

      13.9903      73.1388      7.30314

      40.8773      4.95458      25.9772

IDL> ;生成2*3的[0,255]范围内的整型随机数组

IDL> print,fix(randomu(undefinevar,3,2)*255)

      85     216     247

     181     180      83

IDL> ;生成2*3的[0,2(32次方)-1]范围内的长整型随机数组

IDL> print,randomu(undefinevar,3,2,/long)

  1945085313   713527705   771678015

   128722589  2010134861  1909949562

IDL> ;生成[-1,1]范围内的4元素随机数组

IDL> print,RANDOMN(undefinevar,4)

     0.578943     0.561237    -0.391116   -0.0516022

IDL> ;生成[-1,1]范围内的3*4随机数组

IDL> print,RANDOMN(undefinevar,4,3)

     0.770915     0.483093    -0.668937    -0.855310

    -0.939424      1.94780    -0.301939    -0.316978

    -0.777380    -0.521554      1.52465     0.473643