public Frame subframe(String[] names) {
Vec[] vecs = new Vec[names.length];
HashMap<String, Integer> map = new HashMap<String, Integer>();
for (int i = 0; i < _names.length; ++i) map.put(_names[i], i);
for (int i = 0; i < names.length; ++i)
if (map.containsKey(names[i])) vecs[i] = _vecs[map.get(names[i])];
else throw new IllegalArgumentException("Missing column called " + names[i]);
return new Frame(names, vecs);
}
private static int guessNcols(ParserSetup setup, String[][] data) {
int res = data[0].length;
if (setup._header) return res;
boolean samelen = true;
for (String[] s : data) samelen &= (s.length == res);
if (samelen) return res;
// we don't have lines of same length, pick the most common length
HashMap<Integer, Integer> lengths = new HashMap<Integer, Integer>();
for (String[] s : data) {
if (!lengths.containsKey(s.length)) lengths.put(s.length, 1);
else lengths.put(s.length, lengths.get(s.length) + 1);
}
int maxCnt = 0;
for (Map.Entry<Integer, Integer> e : lengths.entrySet())
if (e.getValue() > maxCnt) {
maxCnt = e.getValue();
res = e.getKey();
}
return res;
}