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    %% Specify Nonuniform _x_-Axis Tick Values
% Display tick marks along the _x_-axis at nonuniform values between -5
% and 5. MATLAB(R) labels the tick marks with the numeric values.

x = linspace(-5,5);
y = x.^2;
plot(x,y)
xticks([-5 -2.5 -1 0 1 2.5 5])