/** Seed the conversion using a last measurement */
public Measurement convert(Reading r, Measurement last) {
if (last != null) {
this.Xt = last.getX();
this.Yt = last.getY();
this.Zt = last.getZ();
}
// if the last measurement failed, set back to origin
if (this.Xt > 9.E99) {
this.Xt = 0;
}
if (this.Yt > 9.E99) {
this.Yt = 0;
}
if (this.Zt > 9.E99) {
this.Zt = 0;
}
return convert(r);
}
