See if this does what you want:
x=[10 50 100 500 1000 1500 2000 2500 3000]; %data points
y=[74.6 88.8 89.6 92.1 92.5 88.8 88.8 87.9 85.4]; %accuracy(%)
xt = [10 50 100 500 1000 1500 2000 2500 3000 3500];
xv = 1:length(xt);
yv = interp1(x, y, xt, 'linear', 'extrap'); % Extrapolate The ‘3500’ Value
figure(1)
plot(xv, yv) % Plot Interpolated Values Against ‘xv’
grid
set(gca, 'XTickLabel',xt) % Label Ticks As ‘xt’
ylabel('Accuracy (%)')
If you do not want to extrapolate to 3500, the code would be:
x=[10 50 100 500 1000 1500 2000 2500 3000]; %data points
y=[74.6 88.8 89.6 92.1 92.5 88.8 88.8 87.9 85.4]; %accuracy(%)
xv = 1:length(x);
figure(1)
plot(xv, y) % Plot Interpolated Values Against ‘xv’
grid
set(gca, 'XTickLabel',x) % Label Ticks As ‘xt’
ylabel('Accuracy (%)')
