/** Get the FrequencyDistribution object */
protected FrequencyDistribution getFrequencyDistribution(Variate data, int minimumBinCount) {
double min = (Double) data.getMin();
double max = (Double) data.getMax();
if (min == max) {
if (min == 0) {
min = -1.0;
} else {
min -= Math.abs(min / 10.0);
}
if (max == 0) {
max = 1.0;
} else {
max += Math.abs(max / 10.0);
}
}
Axis axis = new LinearAxis(Axis.AT_MAJOR_TICK, Axis.AT_MAJOR_TICK);
axis.setRange(min, max);
int majorTickCount = axis.getMajorTickCount();
axis.setPrefNumTicks(majorTickCount, 4);
double binSize = axis.getMinorTickSpacing();
int binCount = (int) ((axis.getMaxAxis() - axis.getMinAxis()) / binSize) + 2;
if (minimumBinCount > 0) {
while (binCount < minimumBinCount) {
majorTickCount++;
axis.setPrefNumTicks(majorTickCount, 4);
binSize = axis.getMinorTickSpacing();
binCount =
(int) ((axis.getMaxAxis() - axis.getMinAxis()) / binSize)
+ 2; // should +2, otherwise the last bar will lose
}
}
FrequencyDistribution frequency =
new FrequencyDistribution(axis.getMinAxis(), binCount, binSize);
for (int i = 0; i < raw.getCount(); i++) {
frequency.addValue((Double) raw.get(i));
}
return frequency;
}
/** Set data */
public void setData(Variate data, int minimumBinCount) {
raw = data;
FrequencyDistribution frequency = getFrequencyDistribution(data, minimumBinCount);
Variate.D xData = new Variate.D();
Variate.D yData = new Variate.D();
double x = frequency.getLowerBound();
for (int i = 0; i < frequency.getBinCount(); i++) {
xData.add(x);
yData.add(0.0);
x += frequency.getBinSize();
xData.add(x);
yData.add(frequency.getProb(i));
}
setData(xData, yData);
}