Paul
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Content Feed
Integration of real variable function on arbitrary interval.
Why would you expect the result to be 3/4? Plotting the function, assuming we want the real cube root plot(-1:.01:1,nthroot(-1...
22 minutes ago | 0
Create FFT filter of small FFT amplitudes and replot orginal signal
Hi Coleman, If I understand your question correctly .... Once you do this: P2 = abs(Datafft/L); P1 = P2(1:L/2+1); P1(2:end-...
2 hours ago | 0
How to find the frequency and amplitude of an oscillating signal?
Hi Rohan, For this signal, the output of fft without windowing gives a very good estimate of the amplitude and frequency of the...
24 hours ago | 1
Simulink add Transferfunction as binominal equation
Hi Gunnar, You can use the LTI System block and enter as the block parameter: p(1)*tf(1,[p(2) 1])^p(3) assuming that only the ...
1 day ago | 0
finding the coordinate where imaginary value is zero in nyquist plot
The doc page for nyquist shows how to use it to return the real (Re) and imaginary (Im) parts along with the frequency vector (w...
1 day ago | 0
Getting trouble in EKF for pendulum (not tracking perfectly)
The state prediction equation needs to be modified, see below. I didn't verify the rest of the equations. g = 9.81; ...
1 day ago | 0
string match and replace string with matching number from another matrix
From the desription, it sounds like the StimNo file contains a cell array (assuming all file names are unique) stimno = {'air.w...
4 days ago | 0
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Observer gain matrix calculations give warning when replicated with Matlab
Hi NGiannis, Here's the plant model and desired pole locations Gp=tf(1, [1 0 1 0]); s1=-1+i; %Desired closed loop poles s2=-...
5 days ago | 0
Root Locus Plot Is Way Off
Hi Arpad, Let's take a look at that root locus for the uncompensated system. I asusme that the red x's indicate the desired clo...
6 days ago | 0
lla2eci conversion for geo sat
Hi Derrick, I think the effect we're seeing here is a slight angular offset betweent the ECI z-axis and the Earth's axis of rot...
6 days ago | 0
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Unable to find transfer functon using model linearizer
Hi S L, Can you provide the parameters for your sinestream input signal? I couldn't get the Model Linearizer to run to complet...
6 days ago | 0
stem a convolve signal
Because the first point in x corresponds to t = 0, so does the first point in y. t_conv has to have as many points as y. And the...
6 days ago | 0
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Error using .* Matrix dimensions must agree.
The anonymous function fun won't work unless the input arguments x and y are compatible for elementwise-multiplication with u an...
7 days ago | 0
unexpected discontinuity in graphic
Hi Konstantinos, Your plot, the plot I got on my local machine, and the plot generated here aren't quite the same,presumbably d...
7 days ago | 0
How to simply multiply a symbolic variable into a matrix?
I'm pretty sure that if u is to be symbolic then so must be A (unless you make A into a cell array, which is probably not the wa...
9 days ago | 0
How to use multiple input-output datasets in ssest function (MIMO System Identification Toolbox).
The article also describes how to use the tt input to describe MIMO data sets (and for multiple experiments if that's needed): l...
9 days ago | 0
| accepted
Update M-script parameter value Continuously based on Workspace Data fed by a Simulink Model
The To Workspace block doesn't update the output in the workspace "continuously" while the simulation is running. Also, Simulink...
10 days ago | 0
| accepted
What approach can I take to design a filter that fits (approximately) the average power spectrum of multiple signals.
Hi G, Do you have the amplitude and phase spectra for the red curve? If so, you can try using tfest, though that spike at arou...
10 days ago | 0
How to save the result of each loop separately
One option is to use a cell array to store dissimilar objects y = [3 4]; for i=1:length(y) x{i}=zeros(y(i),2) end Thoug...
10 days ago | 0
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How to enter vector coefficients to z-transform
g = [2,2.2,2.3]; a1 = [2, 5,8]; a2 =[ 1,0.3,0.4]; HZ = tf(zeros(3),'Ts',-1); for ii = 1:3 HZ(ii,ii) = tf(g(ii)*[1 2 1],...
10 days ago | 1
Numerical error in simulink
Hi Junghyo Kim, Your question references "division by 0" but the error message has nothing to do with division by zero. The er...
11 days ago | 0
| accepted
Different integration results from int method in symbolic math toolbox
Looks like a bug in the computation of F2? syms x w; assume(x,"real"); assumeAlso(w,"real"); % integration y1=exp(-1i*w*x-x...
12 days ago | 1
Magnitude response of allpass filter - group-delay equalization of an IIR filter
Hi Jay, Here is the filter [be,ae] = ellip(4,1,40,0.2); f = 0:0.001:0.2; g = grpdelay(be,ae,f,2); % Equalize only the pass...
16 days ago | 0
| accepted
Converting 4th order IIR filter to SOS (second-order sections)
Does tf2sos provide the desired result?
16 days ago | 0
| accepted
Why is there no Integrator with data type single ?
How about using a Discrete Time Integrator?
17 days ago | 0
How do create a simulink filter if I have the impulse response
Hi Joe, Why not derive the transfer function H(s) as the Laplace transform of h(t), and then implement H(s) in the Transfer Fcn...
17 days ago | 0
Compute conditional mean from distribution
Hi Fredrik, If you just want to compute the conditional mean, why not just use the third expression for Conditional Expectation...
17 days ago | 0
Simulating a plant in Simulink
The Zero-Order Hold block with Sample Time parameter set to an expression that evaluates to the sampling period T does the sampl...
17 days ago | 0
Lookup Table in Simulink
Hi wafaa, If the area and volume are both represented by by 2D arrays of the same size, and if the length and width input break...
18 days ago | 1
| accepted
How to convert time varying state matrix to ss ?
ss and other dynamic system models in the Control System Toolbox only support linear, time-invariant, systems, so the A-matrix i...
18 days ago | 0
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