public static RInt expandXVector(IntImpl xarg, int xsize, int count) {
int nsize = xsize * count;
int[] x = xarg.getContent();
int[] res = new int[nsize];
int offset = 0;
for (int rep = 0; rep < count; rep++) {
System.arraycopy(x, 0, res, offset, xsize);
offset += xsize;
}
return RInt.RIntFactory.getFor(res);
}
public static RInt expandYVector(IntImpl yarg, int ysize, int count) {
int size = ysize;
int nsize = size * count;
int[] y = yarg.getContent();
int[] res = new int[nsize];
int offset = 0;
for (int elem = 0; elem < size; elem++) {
int v = y[elem];
Arrays.fill(res, offset, offset + count, v);
offset += count;
}
return RInt.RIntFactory.getFor(res);
}
// an attempt for performance improvement: but does not seem faster for now
public static RInt expandXVectorCacheFriendly(IntImpl xarg, int xsize, int count) {
int nsize = xsize * count;
int[] x = xarg.getContent();
int[] res = new int[nsize];
int offset = 0;
int rep = 0;
int lastOffset = 0;
if (rep < count) {
System.arraycopy(x, 0, res, offset, xsize);
lastOffset = offset;
offset += xsize;
}
for (rep = 1; rep < count; rep++) {
System.arraycopy(res, lastOffset, res, offset, xsize);
lastOffset = offset;
offset += xsize;
}
return RInt.RIntFactory.getFor(res);
}