FORUM FOR DISCUSSION ON MATLAB
Matlab is a commercial “Matrix Laboratory” package which operates as an interactive programming environment. It is a mainstay of the Mathematics Department software lineup and is also available for PC’s and Macintoshes and may be found on the CIRCA VAXes. Matlab is well adapted to numerical experiments since the underlying algorithms for Matlab’s builtin functions and supplied m-files are based on the standard libraries LINPACK and EISPACK.
The capabilities of Matlab can be extended through programs written in its own programming language. It provides the standard constructs, such as loops and conditionals; these constructs can be used interactively to reduce the tedium of repetitive tasks, or collected in programs stored in “m-files” (nothing more than a text file with extension “.m”).
Matlab is a very useful tool. And has an array of applications. Some of them are :-
Mathematical computation, analysis, visualization, and algorithm development
Control Design
Model-Based Design for control systems, including simulation, rapid prototyping, and code generation for embedded systems
DSP – Digital Signal Processing & Communications
Model-Based Design for signal processing and communication systems, including simulation, code generation, and verification
Image Processing
Image acquisition, analysis, visualization, and algorithm development
Test & Measurement
Hardware connectivity and data analysis for test and measurement applications
Computational Biology
Analysis, visualization, and simulation of biological data and systems
Computational Finance
Financial modeling, analysis, and application deployment
Looking at such a wide array of implementation for MATLAB, I was surprised not to find many Forums on this topic. I love working on MATLAB and would like to share my knowledge with anyone who has a question or in need. I have found that many people know how to make a program but lack the basics. So I have started this forum for discussions as only discussion can help clear the fundamental concepts.
Hi all,
i am going to write a FOR loop in matlab and read the address of Images with Imread command.
But i do not know how to write this loop and Imshow them after reading them.
Can any body help me?
Regards,
Farhang
@praphul
i think you should refer a book….one good book to study dtft is oppenheim….here dtft is given in detail….
how do we calculate a dtft?
i am stuck up at a point in some code I am writing. I desprately need someone to tell me what i am doing wrong here. am posting the code below:
%Declaring values of all variables
co=1000
r=150
l1=1400
l2=130
% Calculating value of variable H
h=1000*tan(15*(pi/180))
%Creating a matrix with fii values in degrees
fii=15:5:145
%Converting fii Values to radians
fii=fii.*(pi/180)
Result=[];
%Declaring the two equations that need to be solved
eq1=inline(‘(co-r*sin(fi))^2 + x^2 – 2*(co-r*sin(fi))*x + (r*cos(fi))^2 + y^2 – 2*(r*cos(fi))^2*y – l2^2′,’x',’y')
eq2=inline(‘x^2 + h^2 + y^2 -2*h*y – l1^2′,’x',’y')
%Using a for loop to iterate through various values of fii and solve eq1
%and eq2
for i=1:26
fi=fii(i)
U=solve(eq1,eq2) % Error at this point
if U.Y(1)>U.Y(2)
Result(i,1)=U.X(1);
Result(i,2)=U.Y(1);
else
Result(i,1)=U.X(2);
Result(i,2)=U.Y(2);
end
end
Error message:
??? Function ‘strncmp’ is not defined for values of class ‘inline’.
Error in ==> strncmp at 25
[varargout{1:nargout}] = builtin(‘strncmp’, varargin{:});
Error in ==> maple at 44
if strncmp(F,’trace’,5)
Error in ==> solve at 75
[t,stat] = maple(v);
Error in ==> Path1 at 23
U=solve(eq1,eq2)
@vivek
instead of using inline use equations directly in the solve, something like
U=solve(‘(co-r*sin(fi))^2 + x^2 – 2*(co-r*sin(fi))*x + (r*cos(fi))^2 + y^2 – 2*(r*cos(fi))^2*y – l2^2=0′,’x^2 + h^2 + y^2 -2*h*y – l1^2=0′,’x',’y')
and also check the syntex of your first equation.
pls tell me what is the difference between dicreet time fourier transform and Z transform. and how can we calculate dtft in matlab?
@niraj
dtft is just the z transform on the unit circle…..to calculate dtft you can use FREQZ command…..
can i use c programs with matlab. pls reply quickly.
@arijit
SIMULINK is an interactive system for the nonlinear simulation of dynamical systems. It is a graphical, mouse-driven program that allows systems to be modelled by drawing a block diagram on the screen. It can handle linear, nonlinear, continuous-time, discrete-time, multivariable, and multirate systems. SIMULINK runs on workstations using X-windows, under MicroSoft Windows on the PC, and on the Macintosh. It takes full advantage of windowing technology, including pull-down windows and mouse interactions. SIMULINK is fully integrated with MATLAB, and, together with MATLAB and the Control System Toolbox, forms a complete control system design and analysis environment.
can you tell me what is a simulink??
@pooja
MATLAB’s MEX-file facility allows user to use C subroutines as MATLAB m-files. It is also possible to use MATLAB as a computational engine for C subroutines.