Question

I am trying to read tsv data using d3. However, my data has comment lines as follows

#Comment line
@Different comment line
x    y
1    2
4    2
5    1

Is it possible to get d3 to ignore those lines?

Thanks

Answer 1

D3 has no built-in way to ignore comment lines. Your easiest option is going to be to pre-process the file before parsing with D3:

d3.text(url, 'text/csv', function(csv) {
    // remove comment rows with regex - not fully tested, but should work
    csv = csv.replace(/^[#@][^\r\n]+[\r\n]+/mg, '');
    var data = d3.csv.parse(csv);

    // ... now the rest of your code ...
});