程序

Fortran程序调用

关键词继承

系统调用spawn

程序自我调用

IDL script

common 模块

IDL子程序

IDL中的积分程序

编译选项

• compile_opt,idl2,hidden

idl2使得程序的默认整数变成32位（long）的，比较有用

hidden，从help路径里面隐藏一些小的子程序

• on_error,2

0 Stop immediately at the statement in the context of the procedure or function that caused the error. This is the default action.

1 Return to the main program level and stop.

2 Return to the caller of the program unit that called ON_ERROR and stop.

3 Return to the program unit that called ON_ERROR and stop.