IDL中数组动态扩展的方法

IDL作为一种完全面向矩阵的动态语言，数组是其最基本的结构，在IDL中可直接对数组进行扩展，这在C#和Java这类编译型语言中，是无法做到的。在C#和Java中实现动态数据结构，往往需要用到List，Array，Vector等动态数组封装类，通过这些类中的Add和Delete等方法来对元素进行操作。在IDL中，对数据的动态操作非常方便，数组大小和结构可根据运行候程序的需要自动变化。在数组元素无法确定时，常采用数组合并的方式来动态的扩充数组，同时保持数组原有元素的不变性。数组合并的运算符为“[ ]”，关于“[ ]”操作符，IDL帮助中描述如下：

[ ]：Array concatenation
The expression [A,B] is an array formed by concatenating A and B, which can be scalars or arrays, along the first dimension.

To concatenate second and third levels, nest the brackets; [[1,2],[3,4]] is a 2-element by 2-element array with the first row containing 1 and 2 and the second row containing 3 and 4. Operands must have compatible dimensions; all dimensions must be equal except the dimension that is to be concatenated, e.g., [2,INTARR(2,2)] are incompatible.
Eg:
Define C as three-point vector:
C = [0, 1, 3]
Add 5 to th