Indexing Data 2D-Matrix in Parameter

[khan]

Hello Every one,

I am new here in AMPL. I want to know how can I index 2-D data matrix in a parameter. Like in my case I have 32X65 Matrix. And I want to read and Index this matrix in the objective function so that can be utlized. 

Also how can I represent this 32X65 matrix in .dat file?

Your suggestion are already appreciated alot.

Thanking you in anticipation.

[khan]

anyone?

[victor.z...@gmail.com]

Creating a parameter representing a two-dimensional matrix is pretty straightforward:

  param M;

  param N;

  param A{1..M, 1..N};

  data;

  param M := 32;

  param N := 65;

  param A

  :  1  2  3 ... 65 :=

  1 <row1-elements>

  2 <row2-elements>

  ...

  32 <row32-elements>;

HTH,

Victor

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[Robert Fourer]

The best way to learn about this topic is to read the relevant sections in the AMPL book (http://ampl.com/resources/the-ampl-book/chapter-downloads/). There's an example of a 2-dimensional parameter and its data in Chapter 2 -- see particularly the parameter "amt" in Figure 2-1 and the data for it in Figure 2-2 -- and there are several more examples in Chapters 3 and 4.

Bob Fourer
am...@googlegroups.com

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