Method fitCurve

ij/src/main/java/ij/macro/Functions.java:6124–6180

(boolean withWeights)

	}

	double fitCurve(boolean withWeights) {
		interp.getLeftParen();
		int fit = -1;
		String name = null;
		double[] initialValues = null;
		if (isStringArg()) {
			name = getString();
			if (!name.contains("Math."))
				name = name.toLowerCase(Locale.US);
			String[] list = CurveFitter.fitList;
			for (int i=0; i<list.length; i++) {
				if (name.equals(list[i].toLowerCase(Locale.US))) {
					fit = i;
					break;
				}
			}
			boolean isCustom = name.indexOf("y=")!=-1 || name.indexOf("y =")!=-1;
			if (fit==-1&&!isCustom)
				interp.error("Unrecognized fit");
		} else
			fit = (int)interp.getExpression();
		double[] x = getNextArray();
		interp.getComma();
		double[] y = getNumericArray();
		double[] weights = null;
		if (withWeights) {
		interp.getComma();
			weights = getNumericArray();
		}
		if (interp.nextToken()==',') {
			interp.getComma();
			initialValues = getNumericArray();
		}
		interp.getRightParen();
		if (x.length!=y.length)
			interp.error("Arrays not same length");
		if (x.length==0)
			interp.error("Zero length array");
		fitter = new CurveFitter(x, y);
		if (withWeights)
			fitter.setWeights(weights);
		fitter.setStatusAndEsc(null, true);
		if (fit==-1 && name!=null) {
			Interpreter instance = Interpreter.getInstance();
			int params = fitter.doCustomFit(name, initialValues, showFitDialog);
			Interpreter.instance = instance;
			if (params==0)
				interp.error("Invalid custom function");
		} else
			fitter.doFit(fit, showFitDialog);
		if (logFitResults) {
			IJ.log(fitter.getResultString());
			logFitResults = false;
		}
		showFitDialog = false;
		return Double.NaN;
	}