/**
* Evaluate a function at a specific point in x
*
* @param vars Values for evaluation separated by commas, x=1,y=2,z=3
* @return function value at x
*/
public double eval(String vars) {
// get all variables
String[] tmp = vars.split(",");
// double[] vd = new double[tmp.length];
for (int i = 0; i < tmp.length; i++) {
String[] vv = tmp[i].split("=");
if (vv.length != 2) {
ErrorMessage("Error in parsing list of input variablse. Did you use val=number? ");
}
try {
double d = Double.valueOf(vv[1].trim()).doubleValue();
jep.addVariable(vv[0].trim(), d);
} catch (NumberFormatException nfe) {
System.out.println("NumberFormatException: " + nfe.getMessage());
}
}
try {
Object result = jep.evaluate(node);
if (result instanceof Double) {
return ((Double) jep.evaluate(node)).doubleValue();
}
} catch (ParseException e) {
return 0;
}
return 0;
}
/**
* Evaluate a function at a specific point for one single variable. Evaluation is done between
* xmin and xmax
*
* @param indvars Define independent variable, like 'x' Only one variable is allowed
* @param xmin xmin value for independent varible
* @param xmax xmax value for independent varible
* @param vars define values for other variables, like 'y=1,z=3'
* @return true if no errors
*/
public boolean eval(String indvars, double xmin, double xmax, String vars) {
String name = proxy.getName();
int points = proxy.getPoints();
boolean suc = true;
String[] tmp = vars.split(",");
// double[] vd = new double[tmp.length];
fixedVars = vars;
for (int i = 0; i < tmp.length; i++) {
String[] vv = tmp[i].split("=");
if (vv.length != 2) {
ErrorMessage("Error in parsing list of input variablse. Did you use val=number? ");
}
try {
double d = Double.valueOf(vv[1].trim()).doubleValue();
jep.addVariable(vv[0].trim(), d);
} catch (NumberFormatException nfe) {
System.out.println("NumberFormatException: " + nfe.getMessage());
suc = false;
}
}
double min = xmin;
double max = xmax;
x = new double[points];
y = new double[points];
for (int i = 0; i < points; i++) {
x[i] = min + i * (max - min) / (points - 1);
jep.addVariable(indvars.trim(), x[i]);
try {
Object result = jep.evaluate(node);
if (result instanceof Double) {
y[i] = ((Double) jep.evaluate(node)).doubleValue();
}
} catch (ParseException e) {
jhplot.utils.Util.ErrorMessage(
"Failed to parse function " + name + " Error:" + e.toString());
suc = false;
}
}
if (suc) isEvaluated = true;
return suc;
} // end 1-D evaluation