This app was programmed with Java in Android Studio. It is compiled with SDK 34 and targets SDK 24 - 33. It is a helpful tool for mathematical modeling and for quick conversion between integrals and derivatives. It is inspired from one of my first projects which I originally programmed with Python and Tkinter.
We calculate the derivative as follows:
void derivative() {
try {
double coefficientValue = Double.parseDouble(coefficient.getText().toString());
double powerValue = Double.parseDouble(power.getText().toString());
double answerCoefficient = coefficientValue * powerValue;
double answerPower = powerValue - 1;
coefficientAnswer.setText(String.valueOf(answerCoefficient));
powerAnswer.setText(String.valueOf(answerPower));
} catch (NumberFormatException e) {
// Handle parsing errors
Log.e("Error", "Invalid input");
}
}Similarly, we calculate the inegral:
void integral() {
try {
double coefficientValue = Double.parseDouble(coef
ficient.getText().toString());
double powerValue = Double.parseDouble(power.getText().toString());
double answerPower = powerValue + 1;
double answerCoefficient = coefficientValue / answerPower;
powerAnswer.setText(String.valueOf(answerPower));
coefficientAnswer.setText(String.valueOf(answerCoefficient));
} catch (NumberFormatException e) {
// Handle parsing errors
Log.e("Error", "Invalid input");
}
}We can plot the data with the help of the MPAndroidChart library. Once we set up some preferences and plot configurations, we can calulate our data points:
private List<Entry> generateQuadraticData(double coefficient, double power) {
List<Entry> entries = new ArrayList<>();
// increment by .1 to smooth out the curves
for (float x = -20; x <= 20; x += 0.1) {
float y = (float) (coefficient * Math.pow(x, power));
entries.add(new Entry(x, y));
}
Log.d("GraphActivity", "generateQuadraticData entries: " + entries);
return entries;
}We plot the data with the following function:
private void setData(LineChart chart, List<Entry> dataSet, String label, int lineColor) {
LineDataSet lineDataSet = new LineDataSet(dataSet, label);
lineDataSet.setColor(lineColor);
lineDataSet.setLineWidth(2f);
LineData lineData = new LineData(lineDataSet);
chart.setData(lineData);
// Refresh chart
chart.invalidate();
}Proudly crafted with ❤️ by Shera Adams.