i want my compare function to only estimate fit for a certain range in matlab

main.m
function [fit, gof] = compare_range(xdata, ydata, fittype, xlimits)
%COMPARE_RANGE Compare data to a fit for a specified range
%   [FIT, GOF] = COMPARE_RANGE(XDATA, YDATA, FITTYPE, XLIMITS) compares the
%   data in XDATA and YDATA to a fit of the type specified by FITTYPE. The
%   function returns the fitted data (FIT) and the goodness-of-fit metrics
%   (GOF). The fit is only estimated for data in XDATA within the range
%   specified by XLIMITS.

% Subset data within specified range
rangeIdx = xdata >= xlimits(1) & xdata <= xlimits(2);
xdata = xdata(rangeIdx);
ydata = ydata(rangeIdx);

% Perform fit
[fit, gof] = fit(xdata, ydata, fittype);
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