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Why do we use ifft instead of fft when looking at the spectrum of a sech pulse (uu) in this code?
Hi Siheon, Your interpretation of fft as going from time to frequency, and ifft as going from frequency to time, with fft and i...

대략 2년 전 | 0

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Is enabled subsystem confusing? (Enable Port)
Hi Ahmed, To me that looks like an error in the documentation. That parameter controls what happens to the states inside the su...

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Discrete convolution in time/Laplace domain
Simplest and most efficient approach would be to compute samples r_i = r(i*T) where T is the sampling period and then use conv t...

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Is the "kinematicTrajectory" function correct for calculating angular velocity?
Hi Erik, The code is comparing two different quantities: Here, T is the matrix that mutliplies the angular velocity vector res...

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Extracting Data from an Array of Arrays using a Loop?
Hi Kylen, To make sure I understand correctly .... at the end of the processing you have a variable called 'out' and it is an a...

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How to use previous answer in new calculation n times
A=[0.3 -0.2; -0.6 0.8]; B=[-14;2]; x=[1;2]; sys = ss(A,B,eye(2),0,-1); y = lsim(sys,ones(11,1),0:10,x); % y0 = x %y...

대략 2년 전 | 2

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Frequency response of a system operating at a fixed frequency
Hi Alberto, Conceptually, what you're doing is correct (though there are other alternatives to the input signal). Keep in mind ...

대략 2년 전 | 1

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Designfilt and bandstopfir adds +320dB for some reason
Hi Andres, I don't have a complete answer, just an observation. Here's the original design with order 301 filterObject1 = des...

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hey so i need to repeat the code everytime to see and analyze the time responses for 20 different values of k. How can i do it at once and have the output for all the values?
Or use a model array plant = tf(20,[1 1 5]); k = realp('k',1); sys = feedback(k*plant,1); sysarr = sampleBlock(sys,'k'...

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Even & Odd Discrete time Signals
Matlab doesn't support zero or negtaive indices, so it won't be possible to implement this operation using ordinary vector index...

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Digital filter with lowpass, then filtfilt: different output
lowpass calls filtfilt (or executes code equivalent to filtfilt) only if the underlying filter is IIR. If it's FIR, as in the qu...

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Assertion block does not stop simulation if I run the model with "sim" function
According to this doc page, pausing a simualtion while it's running is not supported when using the sim command. If in your act...

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HELP! Error using plot Vectors must be the same length. Error in Doc (line 94) plot(t, y);
Hi Matheus, The explanation for the error is that the fftm function is doing a "one-sided" FFT, hence it returns an output with...

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Scaling of Filter Coefficients in "fir1" function
For a FIR filter H(z) = b0 + b1*z^-1 + b2*z^-2 .... + b_n*z^(n-1) its frequency response is H(w) = b0 + b1(exp(-1j*w) + b2*e...

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The real implementaion of the C2D function "Control Systems Toolbox"
Hi Youssef, There are two files named c2d.m which -all c2d I believe the code listed in the question is of the former. The la...

2년 초과 전 | 0

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How does one solve equations between symbolic functions for functions
Maybe isolate is the solution ... syms z(t) theta(t) r eqn = z(t)-r*sin (theta(t)) == 0 z(t) = rhs(isolate(eqn,z(t)))

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Why Does numel() Accept More than One Argument?
@doc:numel indicates that the function accepts only a single argument. But it can be called with more than one argument and it r...

2년 초과 전 | 답변 수: 1 | 1

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Force symbolic simplification to eliminate variable
Hi ludolfusexe, Try equationsToMatrix load ddddh_fun symvar(ddddh_fun) syms u % A*u = b [A,b] = equationsToMatrix(ddddh_fu...

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Band-pass filter extraction.
Hi Claudio, Start with the original code Inertial_period = 20.215; K1_period = 24; % K1 period (hours) M2_period = 12; In...

2년 초과 전 | 1

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How to make variables assigned to SimulationInput object accessible to a PostSimFunction when using parsim
Hi Afzal, I think that the simOut from the simulation being called with sim is the argument sent into the PostSimFcn. Does the ...

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Data type symfun (code problem)
Hi Patryk, Works o.k. here. What version of Matlab are you using? syms x f(x) = x^(3/5) * (4 - x)^(1/3); df(x) = diff(f(x));...

2년 초과 전 | 0

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UAV Toolbox - Reference Frame Definition
In reference to the example on the linked page, I assume the waypoints are specified in the waypoint trajectory reference frame....

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Fourier Series,Spectral Analysys
Define the function over one period T0 = 1; % period f0 = 1/T0; syms t s(t) = rectangularPulse(.2,0.8,t); figure fplot(s(t...

2년 초과 전 | 1

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Read excel data in Simulink and convert it into an array
Add the line coder.extrinsic('readmatrix'); at the top of the Matlab Function after the %#codegen directive. Or, read in the ...

2년 초과 전 | 0

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Why Does dcm2angle Work Like This?
Suppose I have a direction cosine matrix, brought to my attention by a colleague C = round(angle2dcm(-pi/2,-pi/2,0,'ZYX')) Ext...

2년 초과 전 | 답변 수: 0 | 0

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simulink -sinx integral
Hi 승표, It's not really an offset. The Integrator block parmameter 'Initial Condition' is set to zero, which corresponds to sett...

2년 초과 전 | 2

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How can I get the energy of a wave?
Hi Li-Wun, This answer may be what's needed. If not, feel free to post back here with follow-up questions, preferably with exam...

2년 초과 전 | 0

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Obtaining a dataset from bandpass function
Hi Patrik, Is the output argument 'y' from bandpass the filtered time signal that is needed?

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Building symbolic expression with vars from vector
Hi ludolfusexe, It looks like the original code was attempting to use j as a index into an array, but symbolic variables are ne...

2년 초과 전 | 1

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when i want to get magnitude of vector in command window told me that index exceeds matrix dimensions. although i write true code
Code works here v=[1 2 3 9 6] pp=v.^2 Rr=sum(pp) mag=sqrt(Rr) disp(mag) Check norm(v) Perhaps you have variable(s) named...

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