static double[] PDF() {
double normal[] = new double[256];
for (int x = 0; x < 256; x++) {
float sigma = 50;
float m = 128;
double sigmasqr2pi = sigma * Math.sqrt(2 * Math.PI);
float twosigma2 = 2 * sigma * sigma;
normal[x] = Math.exp(-(Math.pow((x - m), 2)) / twosigma2) / (sigmasqr2pi);
}
return normal;
}
static float[][] gaussian() {
float sigma = 1.0f;
float twosigma2 = 2 * sigma * sigma;
float[][] kernel = new float[5][5];
float sum = 0;
for (int x = 0; x < kernel.length; x++) {
for (int y = 0; y < kernel.length; y++) {
kernel[x][y] = (float) Math.exp(-((x * x) + (y * y)) / twosigma2);
sum += kernel[x][y];
}
}
return kernel;
}
// To add/remove functions change evaluateOperator() and registration
public double evaluateFunction(String fncnam, ArgParser fncargs) throws ArithmeticException {
switch (Character.toLowerCase(fncnam.charAt(0))) {
case 'a':
{
if (fncnam.equalsIgnoreCase("abs")) {
return Math.abs(fncargs.next());
}
if (fncnam.equalsIgnoreCase("acos")) {
return Math.acos(fncargs.next());
}
if (fncnam.equalsIgnoreCase("asin")) {
return Math.asin(fncargs.next());
}
if (fncnam.equalsIgnoreCase("atan")) {
return Math.atan(fncargs.next());
}
}
break;
case 'c':
{
if (fncnam.equalsIgnoreCase("cbrt")) {
return Math.cbrt(fncargs.next());
}
if (fncnam.equalsIgnoreCase("ceil")) {
return Math.ceil(fncargs.next());
}
if (fncnam.equalsIgnoreCase("cos")) {
return Math.cos(fncargs.next());
}
if (fncnam.equalsIgnoreCase("cosh")) {
return Math.cosh(fncargs.next());
}
}
break;
case 'e':
{
if (fncnam.equalsIgnoreCase("exp")) {
return Math.exp(fncargs.next());
}
if (fncnam.equalsIgnoreCase("expm1")) {
return Math.expm1(fncargs.next());
}
}
break;
case 'f':
{
if (fncnam.equalsIgnoreCase("floor")) {
return Math.floor(fncargs.next());
}
}
break;
case 'g':
{
// if(fncnam.equalsIgnoreCase("getExponent" )) { return
// Math.getExponent(fncargs.next()); } needs Java 6
}
break;
case 'l':
{
if (fncnam.equalsIgnoreCase("log")) {
return Math.log(fncargs.next());
}
if (fncnam.equalsIgnoreCase("log10")) {
return Math.log10(fncargs.next());
}
if (fncnam.equalsIgnoreCase("log1p")) {
return Math.log1p(fncargs.next());
}
}
break;
case 'm':
{
if (fncnam.equalsIgnoreCase("max")) {
return Math.max(fncargs.next(), fncargs.next());
}
if (fncnam.equalsIgnoreCase("min")) {
return Math.min(fncargs.next(), fncargs.next());
}
}
break;
case 'n':
{
// if(fncnam.equalsIgnoreCase("nextUp" )) { return Math.nextUp
// (fncargs.next()); } needs Java 6
}
break;
case 'r':
{
if (fncnam.equalsIgnoreCase("random")) {
return Math.random();
} // impure
if (fncnam.equalsIgnoreCase("round")) {
return Math.round(fncargs.next());
}
if (fncnam.equalsIgnoreCase("roundHE")) {
return Math.rint(fncargs.next());
} // round half-even
}
break;
case 's':
{
if (fncnam.equalsIgnoreCase("signum")) {
return Math.signum(fncargs.next());
}
if (fncnam.equalsIgnoreCase("sin")) {
return Math.sin(fncargs.next());
}
if (fncnam.equalsIgnoreCase("sinh")) {
return Math.sinh(fncargs.next());
}
if (fncnam.equalsIgnoreCase("sqrt")) {
return Math.sqrt(fncargs.next());
}
}
break;
case 't':
{
if (fncnam.equalsIgnoreCase("tan")) {
return Math.tan(fncargs.next());
}
if (fncnam.equalsIgnoreCase("tanh")) {
return Math.tanh(fncargs.next());
}
if (fncnam.equalsIgnoreCase("toDegrees")) {
return Math.toDegrees(fncargs.next());
}
if (fncnam.equalsIgnoreCase("toRadians")) {
return Math.toRadians(fncargs.next());
}
}
break;
case 'u':
{
if (fncnam.equalsIgnoreCase("ulp")) {
return Math.ulp(fncargs.next());
}
}
break;
// no default
}
throw new UnsupportedOperationException(
"MathEval internal function setup is incorrect - internal function \""
+ fncnam
+ "\" not handled");
}