查看“IDL8”的源代码


'''相对于IDL7.1的IDL8系列的新功能'''
==功能==
*python bridge
:可以在jupyter(ipython)里调用，参见
#将复制到<IDL_DIR>/lib/bridges/kernels/IDL/kernel.json 复制到~/share/jupyter/kernels/IDL
#设置，PATH包含IDL的可执行命令文件夹
设置环境变量PYTHON包含IDL和PYTHON的可执行命令文件夹


==函数==
*idl_convert （单位转换，很实用），参见IDLUNIT() 

==变量==
*变量的运算 [http://www.harrisgeospatial.com/docs/whats_new_8_4.html]
 var = RANDOMU(seed, 200, 100)
 PRINT, var.length
 PRINT, var.ndim
 PRINT, var.dim
 PRINT, var.typecode
 PRINT, var.typename
 PRINT, var1.Mean()
 PRINT, var1.Total()
 var2 = var1.Sort()

*biginteger
:任意位数的整数
===系统变量===
*!const
:常用物理常数


==函数==
*FOLDERWATCH 
:监控文件夹
* CODE_COVERAGE
:监控那些CODE被执行 （选择判断）

*FFT Power Spectrum




==画图==


*errorplot
:完整的误差棒程序
*barplot
:棒状图
*boxplot
*polarplot
:极坐标
*vector
:画矢量图（箭头）
*streamline
*symbol
:画符号，支持latex

*生成图形的code [http://www.harrisgeospatial.com/docs/generatecode.html]
:p.GenerateCode, 'mycode.pro' 

*save
:可以直接把图保存成文件
 p = OBJARR(3)
 ; Create three plots with random data
 FOR i = 0, 2 DO BEGIN
   t = 0.1*FINDGEN(50)
   y = SMOOTH(RANDOMU(seed,50), 5)
   p[i] = PLOT(t,y,'b', SYMBOL='D', TITLE='Observation'+STRING(i+1))
 ENDFOR
 ; Build the multi-page PDF file, one page at a time
 p[0].Save, 'data1.pdf', /APPEND
 p[1].Save, 'data1.pdf', /APPEND
 p[2].Save, 'data1.pdf', /APPEND, /CLOSE

*legend
 a = findgen(11)
 b = 20./(a+1)^2
 p1 = PLOT(a, b, '4', /HISTOGRAM, NAME='Theoretical',  /YLOG, YRANGE=[0.01,100])
 p2 = PLOT(RANDOMU(-1, 11), '4r', NAME='Experimental', TRANSPARENCY=50, /HISTOGRAM, /OVERPLOT)
 h = LEGEND(POSITION=[9,50],label=['haha','papa'] /DATA)

*画多个panel的时候可以用layout关键词,而且可以动态调整
 fn = exp(SIN(FINDGEN(100))^FINDGEN(100))
 w1 = WINDOW()
 p1 = PLOT(fn, LAYOUT = [1, 2, 1], /CURRENT, TITLE = '1')
 p2 = PLOT(fn, LAYOUT = [2, 2, 3], xrange=[25, 42], /CURRENT, TITLE = '2')
 p3 = PLOT(fn, LAYOUT = [2, 2, 4], xrange=[50, 60], /CURRENT, TITLE = '3')

*colorbar 用法更自由，target关键词，不需要自己设计
*直接支持latex符号，text函数
*AXES可以直接在image上画坐标轴

===地图相关===
*map (可以投影天球)
 mymap = MAP('hammer', FILL_COLOR="light_blue")
 ; Convert from longitude/latitude to meters
 longitudes = [-83.02, 88.50]
 latitudes = [42.42, 47.17]
 xy = mymap.MapForward(longitudes, latitudes)
 ; Convert back to longitude/latitude and plot
 EXPAND, xy, 2, 20, xycoordinates
 lonlat = mymap.MapInverse(xycoordinates)
 p = PLOT(lonlat[0,*], lonlat[1,*], 'rS',   /OVERPLOT, /SYM_FILLED)

==数组运算==
*array_equal