public double getCovarianceOfParameters(int i, int j) throws OutOfRangeException {
if (parameters == null) {
return Double.NaN;
}
if (i < 0 || i >= this.parameters.length) {
throw new OutOfRangeException(i, 0, this.parameters.length - 1);
}
if (j < 0 || j >= this.parameters.length) {
throw new OutOfRangeException(j, 0, this.parameters.length - 1);
}
return this.getVcvElement(i, j);
}