Help: Drawing periodic triangle waveform with period (2*pi) and peak between (0 and -pi).

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Mohammed Sayan
Mohammed Sayan 2013-7-10
I need to draw periodic triangle waveform with period (2*pi) that repeats between (-3*pi to 3*pi) with a maximum peak value (0) and minimum peak value equal to (-pi)...Any ideas??
I appreciate any help. Thanks

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Mohammed Sayan
Mohammed Sayan 2013-7-11
x=-3*pi:0.01:3*pi;
f=@(x) pi*(-sawtooth(x,0.5)-1)/2;
line(x,f(x),'color','r', 'linewidth',2.5)

更多回答（1 个）

Image Analyst
Image Analyst 2013-7-11
Here's my triangle wave demo. Creates one triangle then uses repmat to replicate it. Feel free to modify to suit your needs:
format longg;
format compact;
clc; % Clear command window.
workspace; % Make sure the workspace panel is showing.
fontSize = 15;
% Define some parameters that define the triangle wave.
elementsPerHalfPeriod = 30; % Number of elements in each rising or falling section.
amplitude = 5; % Peak-to-peak amplitude.
verticalOffset = -2; % Also acts as a phase shift.
numberOfPeriods = 4; % How many replicates of the triangle you want.
% Construct one cycle, up and down.
risingSignal = linspace(0, amplitude, elementsPerHalfPeriod);
fallingSignal = linspace(amplitude, 0, elementsPerHalfPeriod);
% Combine rising and falling sections into one single triangle.
oneCycle = [risingSignal, fallingSignal(2:end-1)] + verticalOffset;
x = 0 : length(oneCycle)-1;
% Now plot the triangle.
subplot(3, 1, 1);
plot(x, oneCycle, 'bo-');
grid on;
title('One Cycle of the Triangle', 'FontSize', fontSize);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
% Give a name to the title bar.
set(gcf,'name','Demo by ImageAnalyst','numbertitle','off')
% Now replicate this cycle several (numberOfPeriods) times.
triangleWaveform = repmat(oneCycle, [1 numberOfPeriods]);
x = 0 : length(triangleWaveform)-1;
% Now plot the triangle wave.
subplot(3, 1, 2);
plot(x, triangleWaveform, 'bo-');
grid on;
title('Several Cycles of the Triangle', 'FontSize', fontSize);
% Now blur it to smooth it out:
windowWidth = 9;
smoothTriangleWave = conv(triangleWaveform, ones(1,windowWidth)/windowWidth, 'same');
subplot(3, 1, 3);
plot(x, smoothTriangleWave, 'bo-');
grid on;
title('Smoothed Triangle Wave', 'FontSize', fontSize);

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