ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.
One of a set of tools we're offering as a way to say thank you for being a part of the community.
Solved
Compound matrix transformation [code attached]
Posted on 2008-10-09
Hello Experts,
I have the following code which shows the rotation of a 2D polygon and what i want is to modify it using a compound matrix transformation so that the square rotates about an arbitrary point.
Can anyone help me how can i do such a thing ??
Thanks in advance
I have the following code which shows the rotation of a 2D polygon and what i want is to modify it using a compound matrix transformation so that the square rotates about an arbitrary point.
Can anyone help me how can i do such a thing ??
Thanks in advance
close all;
clear all;
% a 2D pologyon
p=[-1 1 1 -1 -1 ; -1 -1 1 1 -1];
% points p = in homogeneous coord
p(3,:)=1;
% axes for plotting the animation
figure;
hold on;
axis([-6 6 -6 6]);
axis equal;
for theta=0:0.005:2*pi
R=[cos(theta) -sin(theta) 0 ; sin(theta) cos(theta) 0 ; 0 0 1];
pdash=R*p;
pdash(1,:)=pdash(1,:)./pdash(3,:);
pdash(2,:)=pdash(2,:)./pdash(3,:);
cla;
plot(pdash(1,:),pdash(2,:),'b');
drawnow;
end
[X]
Welcome to Experts Exchange
Add your voice to the tech community where 5M+ people just like you are talking about what matters.
- Help others & share knowledge
- Earn cash & points
- Learn & ask questions
3 Comments
perdoname_,
Here you are the modified code:
You can learn more here:
Transforming Objects - MATLAB
Here you are the modified code:
You can learn more here:
Transforming Objects - MATLAB
function rotsquare
close all;
clear all;
% a 2D pologyon
p=[-1 1 1 -1 -1 ; -1 -1 1 1 -1];
% points p in XY plane
p(3,:)=0;
% points p = in homogeneous coord
p(4,:)=1;
% axes for plotting the animation
figure;
hold on;
axis([-6 6 -6 6]);
axis equal;
%Rotate about the upper right corner (1,1)
Tx1 = makehgtform('translate',[-1 -1 0]);
Tx2 = makehgtform('translate',[ 1 1 0]);
for theta=0:0.005:2*pi
R=makehgtform('zrotate',theta);
pdash=Tx2*R*Tx1*p;
cla;
plot(pdash(1,:),pdash(2,:),'b');
drawnow;
end
Featured Post
Question has a verified solution.
If you are experiencing a similar issue, please ask a related question
Windows Script Host (WSH) has been part of Windows since Windows NT4. Windows Script Host provides architecture for building dynamic scripts that consist of a core object model, scripting hosts, and scripting engines.
The key components of Window…
This is a research brief on the potential colonization of humans on Mars.
Although Jacob Bernoulli (1654-1705) has been credited as the creator of "Binomial Distribution Table", Gottfried Leibniz (1646-1716) did his dissertation on the subject in 1666; Leibniz you may recall is the co-inventor of "Calculus" and beat Isaac…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210 (2 * 3 * 5 * 7) or 2310 (2 * 3 * 5 * 7 * 11).
The larger templa…
Suggested Courses
Course of the Month6 days, 1 hour left to enroll
688 members asked questions and received personalized solutions in the past 7 days.
Join the community of 500,000 technology professionals and ask your questions.