cell values of a matrix from a pgm file

[Seong]

Hi all,

I am trying to load a matrix from a pgm file. When I get a value from a specific cell [i, j] after loading the matrix, the value looks wrong.
So, I think there is a problem to get a proper value of each cell in the matrix.

To check each cell value of the matrix, I tried to write a pgm file from the matrix.
If I can get proper cell value from the matrix, new pgm file that I write has to be same with the original pgm file.

The results showed that two pgm files are different, and I don't know why.

Please give me some comments to figure this out.

Here is my code to read a pgm file as a matrix, and write a pgm file from the matrix.

//read

    string grid_filename <- "../includes/data/lc2009_200.pgm";
    const grid_matrix type: matrix of: int <- matrix (image ( grid_filename ));


//write

                string sfile <- "../includes/data/" + "lupgm05.pgm";
                save ('P2') to:  sfile type: "text" ;
                save ('2308 3034') to:  sfile type: "text" ;
                save ('999') to:  sfile type: "text" ;
               
                loop j from: 0 to: nrows -1  {
                    string str <- '';
                    loop i from : 0 to: ncols-1 {
                        if (i > 0) {
                            str <- str + " ";
                        }
                        str <- str +  grid_matrix[i, j];
                    }
                    save (str) to:  sfile type: "text" ;
                }           

[Seong]

I also had a go with sugarscape.pgm, which is from the sugarscape toy model.
It seems that there is no problem if a pgm is square. However, if it is not a square type, there is a problem.
Am I right? Since my pgm is not a square type, how can I solve this problem?

Thanks for your time in advance.

Seong

[Patrick Taillandier]

Hi,

For the second problem, you are right, there is a bug concerning the loading of non square pgm file.

I just commited the fix. If your are using the GAMA SVN version, you just have to update GAMA and it should work.

if your are using a release version of GAMA 1.6, a trick consists in changing the extension of your pgm file to csv one, then to load the file in a matrix:

const types type: file <- file('../images/sugarscape1.csv');

matrix mat_types <- matrix(types);

...

init { create animal number: numberOfAgents; ask sugar_cell { maxSugar <- int(mat_types at {grid_x,grid_y+3}); //+3 for the three first lines sugar <- maxSugar; color <- [white,FFFFAA,FFFF55,yellow,dark_yellow] at sugar; } }

Cheers,

Patrick

2014-02-11 6:23 GMT+01:00 Seong <seongk...@gmail.com>:

I also had a go with sugarscape.pgm, which is from the sugarscape toy model.

It seems that there is no problem if a pgm is square. However, if it is not a square, there is problem.
Am I right? Since my pgm is not a square, how can I solve this problem?

Thanks for your time in advance.

Seong

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