plot range -pi to pi

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Abu Yamen
Abu Yamen 2016-12-2
评论： Abu Yamen 2016-12-3
how we can plot sine, cosine and tangent on one Figure window ,my problem was the range --> -π < θ < π.
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Roger Stafford
Roger Stafford 2016-12-2
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
Abu Yamen 2016-12-3
when i select the rang the plot does not give cos or sin

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Image Analyst
Image Analyst 2016-12-2
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')

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