Implement reader for .data / .csv files

[kjossul]

It would be nice to test against a real dataset instead of random generated points. Most of them have .data or .csv extensions. A nice list can be found here. EDIT: a list of datasets for clustering is here!

[sneppy]

I don't know about .data format, but a .csv file is just lines of comma separated values:

FILE * fp = fopen(filename, "r");
Array<T> out;
char buffer[256];
T outvar;
while (fgets(buffer, 256, fp))
    sscanf(buffer, format, &outvar),
    out.push(outvar);
fclose(fp)

[kjossul]

.data files are similar as well. From what I've seen, most datasets have a class in the list of attributes (see iris dataset), meaning that we can use just the other attributes to compute the clustering and we can use the class attribute to check algorithm accuracy and performance.