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Paul


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158 2011 年以降の合計貢献数

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Symsum function for basic electrical engineering calculations.
symsum() is a function in the Symbolic Math Toolbox and takes in symbolic inputs. If I understand that code correctly, all of th...

約10時間 前 | 0

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How can I evaluate characteristic functions in MatLab?
The CF is the Fourier transform of the pdf. Approximate the pdf as a sum of line segments. Take the sum of the Fourier transfor...

3日 前 | 2

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Defined domain integral(convoulution) in simulink
Assuming h is constant and h >= 0 .... It seems like the model can be expressed as follows: wdot(t) = A*w(t) + B*u(t) z(t) = ...

3日 前 | 0

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solving integral equation where the unknow is the upper limit
Assuming T and T0 are positive, it looks like there are two values of T that will satisfy the equation. Not sure why your code i...

6日 前 | 0

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Help using symbolic transfer function
Can do it by hand, at least for this simple case: >> syms K1 K2 K real >> syms s >> K = sym(6); >> G(s) = K1*K2/(s^2 - 3*s -...

6日 前 | 0

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Extract values from Nyquist for negative frequencies
The Nyquist plot is symmetric, so the compex cojugate of the output would correspond to the negative frequencies. [re_pos,im_po...

7日 前 | 0

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Reducing fast dynamic poles in a transfer function.
Maybe freqsep() is what you want: >> G=tf(1,conv([1 5],[1 70])) G = 1 ---------------- s^2 + 75 s + 350 ...

7日 前 | 0

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Matlab Nyquist Sampling Problem
According to doc nyquist you can do nyquist(k1,w) where w is a frequency vector of your choosing.

9日 前 | 0

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The output of my executed code is not giving the answer I am looking for when using the symUnit function
There are many options to which H*Hz can be converted; which one should be chosen automatically? But you can try it yourself: ...

13日 前 | 2

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Spring mass damper system shows position of mass only to be on positive side
The transfer function from Force to Position has dc gain of 2. The input F has a value of 2, so the steady state of the output ...

14日 前 | 1

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Integral of exp(-x)*P(x)/Q(x) in terms of exponential integral in symbolic tooblox
What is the concern with the result that was returned? It looks like the SMT came back with the best answer it could with the in...

20日 前 | 0

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Zero-crossings of Nyquist Diagram
By definition, the gain margin is defined at the point(s) where the Nyquist plot crosses the real axis. Use the allmargin() func...

23日 前 | 0

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What is wrong with my differentiation of function of phi(t)?
I think what you want is to substitute a variable for diff(fi,t), differenitate wrt to that variable, and substitute back. >> s...

24日 前 | 1

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Reduce block diagrams symbolically
Assuming you want final result in terms of the gi(s): syms g1(s) g2(s) g3(s) g4(s) g5(s) symsys1 = g4(s)-g5(s); symsys2 = g...

28日 前 | 0

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Implement a Transfer Function in Code state space higher order
The short story is that dt is too large for this system. Try running with: dt = 1e-5; t = 0:dt:0.03; And don't set u(1) = 0....

29日 前 | 0

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Symbolic Math shows weird behavior - not seen in Wolfram or Octave
It looks like the expected solution can be obtained with some work. Maybe someone else can get there faster. >> syms x real >...

29日 前 | 1

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Sample Time and simOut Interaction
Keep the orginal solver settings you had (assuming they gave you an acceptable solution). Set the Sample Time parameter in the ...

約1ヶ月 前 | 1

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Problem in matrix partition for uncertain system: how to find matrices A, B1, B2, C1, C2, D11, D12, D21, D22?
Suppose you have a model xdot = A*x + B1*w + B2*u z = C1*x + D11*w + D12*u y = C2*x + D21*w + D22*u This system can be rewri...

約1ヶ月 前 | 0

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SS2TF Error
If you want the numerical answer, then don't even bother with the symbolic stuff. Just assign values to the variables R1, R2, C...

約1ヶ月 前 | 0

質問


Can a Comma Separated List be Generated Directly from a sym Array?
Can a comma separated list be generated directly from a sym array for use as input to a sym function? >> xvar=sym('x',[1 4]) ...

約1ヶ月 前 | 1 件の回答 | 0

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How to multiply transfer function in matrix form?
The result you seek can be found by (after running the code in the original question): >> minreal(Dc) ans = -40.36...

約1ヶ月 前 | 0

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Gaussian Mixture Model using gmdistribution
Try this: >> mu=[6.25;4.33]; >> sigma=reshape([0.52 0.37],1,1,2); % third dimesion required, note that sigma are VARIANCES pe...

約1ヶ月 前 | 1

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Transfer Function and step response
You need the the Control System Toolbox.

約1ヶ月 前 | 0

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conversion between state space and transfer function
An infinite number of state space realizations correspond to a single transfer function. From a transfer function, the Control S...

約1ヶ月 前 | 1

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Feedback command for MIMO systems in MATLAB
I think this does what you want (assuming negative feedback) Pitch_State = STATE_SPACE_MODEL({'x';'Theta'},'Pitch Torque') PIT...

約1ヶ月 前 | 0

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Can I define the initial condition at a nonzero point using Simulink integator?
Look at using the Start Time parameter on the Solver Pane (link). As best I can tell, it will do exactly what you want; initial...

約1ヶ月 前 | 0

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Fast Fourier Transform Zero Padding
Try changing these lines: L = length(O2_exp); Y = fft(O2_exp); to L = nfft; % select nfft > numel(O2_e...

約1ヶ月 前 | 0

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Simulink control with moving average
A difference equation of the form y(k)=(c0*u(k)+c1*u(k-1)+c2*u(k-2)+c3*u(k-4)+c4*u(k-4))/D can be implemeted with one of the b...

約1ヶ月 前 | 0

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State Space with Disturbance
Combine d and u into a single input vector: Xdot = A*X + [B F] * [u;d] y = C*X + [D 0]*[u:d] % assuming the disurbance doesn'...

約1ヶ月 前 | 0

質問


Why Would fplot(f) and fplot(vpa(f)) Show Different Results?
I'm seeing different results between fplot for a symfun object, the fplot of the vpa form of that object, and the regular old pl...

約2ヶ月 前 | 1 件の回答 | 0

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