In an earlier post, I showed how to include code snippets in your program. One of the most important principles of programming is the DRY principle: Don’ Repeat Yourself. Code snippets can be used to do stuff you have to code over and over again.

One such a task for me is checking if the row and column totals in a matrix are equal (for example in the input output table you use, you want to check if supply is equal to demand).

 

Here is the code snippet:

 

 

Now you can batinclude (meaning that you can pass

One of the important rules of good programming is the DRY principle: Don’t Repeat Yourself. After repeating myself too often, I decided to start working with code snippets and macros for often used code. Here is an example of code I use very often. Suppose you want to aggregate your data from your input-output table to more aggregated version, for example, from 87 sectors to only 5 sectors, so you can test your model more easily). In GAMS you do this with a mapping, where you map the 87 sectors to the 5 sectors. This mapping can then be used