plot range -pi to pi

how we can plot sine, cosine and tangent on one Figure window ,my problem was the range --> -π < θ < π.

[James Tursa]

Please post the code you are using, and give us more detail on your question. Are you having trouble getting multiple plots on one figure? Or getting the axis range on the plot what you want? Or ...?

[Roger Stafford]

You can't do it! Over that range the tangent function becomes infinite-valued, so there is no way it could ever be completely plotted. You had better make some provision for avoiding such infinite or extremely large numbers in your plot.

[Abu Yamen]

when i select the rang the plot does not give cos or sin

Answer 1

[Image Analyst]

Try this:

% Initialization / clean-up code.
clc;    % Clear the command window.
close all;  % Close all figures (except those of imtool.)
clear;  % Erase all existing variables. Or clearvars if you want.
workspace;  % Make sure the workspace panel is showing.
format long g;
format compact;
fontSize = 20;

theta = linspace(-pi, pi, 1000);
period = 3*pi/4;  % Whatever you want.
sint = sin(2 * pi * theta / period);
plot(theta, sint, 'b-', 'LineWidth', 2);
hold on;
cosinet = cos(2 * pi * theta / period);
plot(theta, cosinet, 'r-', 'LineWidth', 2);
tant = tan(2 * pi * theta / period);
plot(theta, tant, '-', 'Color', [0, 0.5, 0], 'LineWidth', 2);
grid on;
xlabel('Theta [in radians]', 'FontSize', fontSize);
ylabel('Amplitude (signal value)', 'FontSize', fontSize);
title('Trig functions versus Theta', 'FontSize', fontSize);
legend('Sine', 'Cosine', 'Tangent');
% The tangent spikes are so big that we can't see the sin and cosine.
% Let's limit the y range to +/- 4;
ylim([-4, 4]);

% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');
% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')

[Abu Yamen]

perfect sir