how to plot this function?

Answer 1

[Image Analyst]

Here is one way:

x = linspace(-pi, pi, 1000);
f = zeros(1, length(x));
f(abs(x) <= pi/2) = 1;
plot(x, f, 'b-', 'LineWidth', 2)
ylabel('f');
xlabel('x');
grid on;

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[Niloufar]

thank you for your help

Answer 2

[Torsten]

f = @(x) abs(x)<=pi/2;
x = linspace(-pi,pi,200);
plot(x,f(x))

[Niloufar]

it worked thank you so much