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/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package tech.tablesaw.columns.numbers;
import org.apache.commons.math3.random.EmpiricalDistribution;
import org.apache.commons.math3.stat.StatUtils;
import org.apache.commons.math3.stat.descriptive.SummaryStatistics;
import tech.tablesaw.api.DoubleColumn;
import tech.tablesaw.api.NumericColumn;
public interface NumberMapFunctions {
/**
* Returns a transformation of the data in this column such that the result has a mean of 0, and a
* standard deviation of 1
*/
default DoubleColumn normalize() {
double[] result = StatUtils.normalize(asDoubleArray());
return DoubleColumn.create(name() + " normalized", result);
}
String name();
int size();
boolean isEmpty();
double[] asDoubleArray();
/**
* Return the elements of this column as the ratios of their value and the sum of all
* elements
*/
default DoubleColumn asRatio() {
DoubleColumn pctColumn = DoubleColumn.create(name() + " percents", size());
double total = sum();
for (int i = 0; i < size(); i++) {
if (total != 0) {
pctColumn.set(i, getDouble(i) / total);
}
}
return pctColumn;
}
double sum();
/**
* Return the elements of this column as the percentages of their value relative to the sum of all
* elements
*/
default DoubleColumn asPercent() {
DoubleColumn pctColumn = DoubleColumn.create(name() + " percents", size());
double total = sum();
for (int i = 0; i < size(); i++) {
if (total != 0) {
pctColumn.set(i, (getDouble(i) / total) * 100);
}
}
return pctColumn;
}
default DoubleColumn subtract(NumericColumn column2) {
int col1Size = size();
int col2Size = column2.size();
if (col1Size != col2Size)
throw new IllegalArgumentException("The columns must have the same number of elements");
DoubleColumn result = DoubleColumn.create(name() + " - " + column2.name(), col1Size);
for (int r = 0; r < col1Size; r++) {
result.set(r, subtract(getDouble(r), column2.getDouble(r)));
}
return result;
}
default DoubleColumn add(NumericColumn column2) {
int col1Size = size();
int col2Size = column2.size();
if (col1Size != col2Size)
throw new IllegalArgumentException("The columns must have the same number of elements");
DoubleColumn result = DoubleColumn.create(name() + " + " + column2.name(), col1Size);
for (int r = 0; r < col1Size; r++) {
result.set(r, add(getDouble(r), column2.getDouble(r)));
}
return result;
}
default DoubleColumn multiply(NumericColumn column2) {
int col1Size = size();
int col2Size = column2.size();
if (col1Size != col2Size)
throw new IllegalArgumentException("The columns must have the same number of elements");
DoubleColumn result = DoubleColumn.create(name() + " * " + column2.name(), col1Size);
for (int r = 0; r < col1Size; r++) {
result.set(r, multiply(getDouble(r), column2.getDouble(r)));
}
return result;
}
default DoubleColumn divide(NumericColumn column2) {
int col1Size = size();
int col2Size = column2.size();
if (col1Size != col2Size)
throw new IllegalArgumentException("The columns must have the same number of elements");
DoubleColumn result = DoubleColumn.create(name() + " / " + column2.name(), col1Size);
for (int r = 0; r < col1Size; r++) {
result.set(r, divide(getDouble(r), column2.getDouble(r)));
}
return result;
}
default DoubleColumn add(Number value) {
double val = value.doubleValue();
DoubleColumn result = DoubleColumn.create(name() + " + " + val, size());
for (int i = 0; i < size(); i++) {
result.set(i, add(getDouble(i), val));
}
return result;
}
default DoubleColumn subtract(Number value) {
double val = value.doubleValue();
DoubleColumn result = DoubleColumn.create(name() + " - " + val, size());
for (int i = 0; i < size(); i++) {
result.set(i, subtract(getDouble(i), val));
}
return result;
}
default DoubleColumn divide(Number value) {
double val = value.doubleValue();
DoubleColumn result = DoubleColumn.create(name() + " / " + val, size());
for (int i = 0; i < size(); i++) {
result.set(i, divide(getDouble(i), val));
}
return result;
}
default DoubleColumn multiply(Number value) {
double val = value.doubleValue();
DoubleColumn result = DoubleColumn.create(name() + " * " + val, size());
for (int i = 0; i < size(); i++) {
result.set(i, multiply(getDouble(i), val));
}
return result;
}
default double add(double val1, double val2) {
if (DoubleColumnType.isMissingValue(val1) || DoubleColumnType.isMissingValue(val2)) {
return DoubleColumnType.missingValueIndicator();
}
return val1 + val2;
}
default double multiply(double val1, double val2) {
if (DoubleColumnType.isMissingValue(val1) || DoubleColumnType.isMissingValue(val2)) {
return DoubleColumnType.missingValueIndicator();
}
return val1 * val2;
}
default double divide(double val1, double val2) {
if (DoubleColumnType.isMissingValue(val1) || DoubleColumnType.isMissingValue(val2)) {
return DoubleColumnType.missingValueIndicator();
}
return val1 / val2;
}
/**
* Returns the result of subtracting val2 from val1, after handling missing values
*/
default double subtract(double val1, double val2) {
if (DoubleColumnType.isMissingValue(val1) || DoubleColumnType.isMissingValue(val2)) {
return DoubleColumnType.missingValueIndicator();
}
return val1 - val2;
}
/**
* Returns a NumberColumn with the exponential power of each value in this column
*/
default DoubleColumn power(double power) {
DoubleColumn newColumn = DoubleColumn.create(name() + "[pow]", size());
for (int i = 0; i < size(); i++) {
newColumn.set(i, Math.pow(getDouble(i), power));
}
return newColumn;
}
/**
* Returns a NumberColumn with the square of each value in this column
*/
default DoubleColumn square() {
DoubleColumn newColumn = power(2);
newColumn.setName(name() + "[sq]");
return newColumn;
}
default DoubleColumn sqrt() {
DoubleColumn newColumn = DoubleColumn.create(name() + "[sqrt]", size());
for (int i = 0; i < size(); i++) {
newColumn.set(i, Math.sqrt(getDouble(i)));
}
return newColumn;
}
default DoubleColumn cubeRoot() {
DoubleColumn newColumn = DoubleColumn.create(name() + "[cbrt]", size());
for (int i = 0; i < size(); i++) {
newColumn.set(i, Math.cbrt(getDouble(i)));
}
return newColumn;
}
default DoubleColumn cube() {
DoubleColumn newColumn = power(3);
newColumn.setName(name() + "[cb]");
return newColumn;
}
default DoubleColumn remainder(DoubleColumn column2) {
DoubleColumn result = DoubleColumn.create(name() + " % " + column2.name(), size());
for (int r = 0; r < size(); r++) {
double val1 = getDouble(r);
double val2 = column2.getDouble(r);
if (DoubleColumnType.isMissingValue(val1) || DoubleColumnType.isMissingValue(val2)) {
result.setMissing(r);
} else {
result.set(r, getDouble(r) % column2.getDouble(r));
}
}
return result;
}
/**
* Returns the natural log of the values in this column as a NumberColumn.
*/
default DoubleColumn logN() {
DoubleColumn newColumn = DoubleColumn.create(name() + "[logN]", size());
for (int i = 0; i < size(); i++) {
newColumn.set(i, Math.log(getDouble(i)));
}
return newColumn;
}
/**
* Returns the base 10 log of the values in this column as a NumberColumn.
*/
default DoubleColumn log10() {
DoubleColumn newColumn = DoubleColumn.create(name() + "[log10]", size());
for (int i = 0; i < size(); i++) {
newColumn.set(i, Math.log10(getDouble(i)));
}
return newColumn;
}
/**
* Returns the natural log of the values in this column, after adding 1 to each so that zero
* values don't return -Infinity
*/
default DoubleColumn log1p() {
DoubleColumn newColumn = DoubleColumn.create(name() + "[1og1p]", size());
for (int i = 0; i < size(); i++) {
newColumn.set(i, Math.log1p(getDouble(i)));
}
return newColumn;
}
default DoubleColumn round() {
DoubleColumn newColumn = DoubleColumn.create(name() + "[rounded]", size());
for (int i = 0; i < size(); i++) {
newColumn.set(i, Math.round(getDouble(i)));
}
return newColumn;
}
/**
* Returns the rounded values as a NumberColumn. Use roundLong() if larger
*
* @throws ClassCastException if the returned value will not fit in an int
*/
default DoubleColumn roundInt() {
DoubleColumn newColumn = DoubleColumn.create(name() + "[rounded]", size());
for (int i = 0; i < size(); i++) {
newColumn.set(i, (int) Math.round(getDouble(i)));
}
return newColumn;
}
/**
* Returns a NumberColumn with the absolute value of each value in this column
*/
default DoubleColumn abs() {
DoubleColumn newColumn = DoubleColumn.create(name() + "[abs]", size());
for (int i = 0; i < size(); i++) {
newColumn.set(i, Math.abs(getDouble(i)));
}
return newColumn;
}
/**
* For each item in the column, returns the same number with the sign changed.
* For example:
* -1.3 returns 1.3,
* 2.135 returns -2.135
* 0 returns 0
*/
default DoubleColumn neg() {
DoubleColumn newColumn = DoubleColumn.create(name() + "[neg]", size());
for (int i = 0; i < size(); i++) {
newColumn.set(i, getDouble(i) * -1);
}
return newColumn;
}
default DoubleColumn difference() {
DoubleColumn returnValue = DoubleColumn.create(this.name(), this.size());
if (isEmpty()) {
return returnValue;
}
returnValue.setMissing(0);
for (int current = 1; current < size(); current++) {
returnValue.set(current, subtract(getDouble(current), getDouble(current - 1)));
}
return returnValue;
}
/**
* Returns a new column with a cumulative sum calculated
*/
default DoubleColumn cumSum() {
double total = 0.0;
DoubleColumn newColumn = DoubleColumn.create(name() + "[cumSum]", size());
for (int i = 0; i < size(); i++) {
double value = getDouble(i);
if (!DoubleColumnType.isMissingValue(value)) {
total += value;
}
newColumn.set(i, total);
}
return newColumn;
}
/**
* Returns a new column with a cumulative product calculated
*/
default DoubleColumn cumProd() {
double total = 1.0;
DoubleColumn newColumn = DoubleColumn.create(name() + "[cumProd]", size());
for (int i = 0; i < size(); i++) {
double value = getDouble(i);
if (!DoubleColumnType.isMissingValue(value)) {
total *= value;
}
newColumn.set(i, total);
}
return newColumn;
}
/**
* Returns a new column with a percent change calculated
*/
default DoubleColumn pctChange() {
DoubleColumn newColumn = DoubleColumn.create(name() + "[pctChange]", size());
newColumn.setMissing(0);
for (int i = 1; i < size(); i++) {
newColumn.set(i, divide(getDouble(i), getDouble(i - 1)) - 1);
}
return newColumn;
}
default DoubleColumn bin(int binCount) {
double[] histogram = new double[binCount];
EmpiricalDistribution distribution = new EmpiricalDistribution(binCount);
distribution.load(asDoubleArray());
int k = 0;
for(SummaryStatistics stats: distribution.getBinStats()) {
histogram[k++] = stats.getN();
}
return DoubleColumn.create(name() + "[binned]", histogram);
}
double getDouble(int i);
}
