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  1. PO
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    <p>I assume that you are not using symbolic variables. For 2D plotting in matlab you need two equal size vectors, one per axis, so you need to create a x-axis vector and y-axis vector. In your example f(x) = 1- |x| for |x| &lt; 1 you could do this:</p> <pre><code>x = linspace(-5,5,500); %x-axis vector from -5 to 5 with 500 points y = zeros(1,500); %y-axis vector initialized to 0, also 500 points like the x-axis vector y(abs(x) &lt; 1) = 1- abs(x(abs(x)&lt;1)); %the points corresponding to |x|&lt; 1 are set to |x| figure() %new figure plot(x,y) %plot box off %removing box grid on %adding grid xlabel('x axis', 'FontSize', 15) %label of x axis ylabel('y axis', 'FontSize', 15) %label of y axis axis([x(1), x(end), -0.5, 1.5]) %axis limits </code></pre> <p>With that you get a plot like this one:</p> <p><img src="https://i.stack.imgur.com/GCH4D.jpg" alt="enter image description here"></p> <p>For the other functions you have to proceed like in this one, build the x-axis vector and the y-axis vector.</p> <p><strong>UPDATE:</strong> In the other example: <code>f(x) = A for x &gt;= 0 and f(x) = 0 for x &lt; 0</code>:</p> <pre><code>A = 3; x = linspace(-5,5,500); %x-axis vector from -5 to 5 with 500 points y = zeros(1,500); %y-axis vector initialized to 0, also 500 points like the x-axis vector y(x &gt;= 0) = A; %the points corresponding to x &gt;= 0 are set to A figure() %new figure plot(x,y) %plot box off %removing box grid on %adding grid xlabel('x axis', 'FontSize', 15) %label of x axis ylabel('y axis', 'FontSize', 15) %label of y axis axis([x(1), x(end), -0.5, 3.5]) %axis limits </code></pre> <p><img src="https://i.stack.imgur.com/bgLeF.jpg" alt="enter image description here"></p>
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    1. POHow to plot a triangular function and other step functions in Matlab
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    1. USpabaldonedo
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    1. POHow to plot a triangular function and other step functions in Matlab
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    1. COOh thank you so much @pabaldonedo, it looks exactly like what I need. And how should I go on with the other two functions please?
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    2. COI have updated to solve the second example, set A constant to the value you need. If it helps please upvote.
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    3. COOf course it helps and thanks so much. Unfortunately I can't upvote because I have just 14 reputations, though I have chosen this as my best answer. Am not frequenting Stackoverflow like I frequent Mathstackexchange.
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