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Convert sym to double
Hi @Mark, The first problem with the code is in this area W=zeros(1,len); for i=1:len m=mn{f}(i) W(...

約4年前 | 2

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Function solve cannot find explicit solution with 'ReturnConditions'=true but it finds when it is false
Verifying same behavior in 2022a syms t2 t a b ab at bt a2 b2 N x T T0 k assume(N ~= 0 & T ~= 0 & k ~= 0) eq1 = ab == a2*x + ...

約4年前 | 0

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simplify function does not work properly
Consider a simpler case syms x y term1 = x - 1; term2 = y - 2; eq = term1*term2 assume(term1*term2 == 0) simplify(eq) sim...

約4年前 | 0

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Closed form not the same as the discrete form
Hi Tworit, I'm not quite following how the code is trying to implement equation 41 from the linked page. Here is one way to cre...

約4年前 | 0

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Removing all elements from a struct field
Does rmfield meet the need? % create a struct for example for ii=1:13 aap.acq_details.sessions(ii).name = ii; end aap.acq_d...

約4年前 | 0

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Graphs using ode45 do not look like they should. Why is time vector not a linear set?
Hi Josh, Maybe the plots are deceptive. Running the code exactly as given, except for the plotting, shows that v is the derivat...

約4年前 | 0

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FT and Amplitude Phase plot in matlab
The code as shown has at least two issues. When using symbolic math, need to declare variables appropriately syms t w real Bec...

約4年前 | 1

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Add Fields to an existing Structure
S.Level0=0; f = {'SubLevel0','SubLevel1','SubLevel2','Text'}; cvar = '1234'; S = setfield(S,'Level1',f{:},cvar); S.Level0 S...

約4年前 | 3

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please help to fix my code for 4th order Runge Kutta method for second order ODE.
Hi Siti Nafisah Bekti Lelana, Why do you think it's the wrong answer? I didn't check the equations, but the code seems to yield...

約4年前 | 0

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calculate the Γ matrix in MATLAB from Φ Matrix - State space equation
Let's see what we have so far: A = [0 1; -1 -1]; b = [0;1]; I = eye(2); syms s; LaplaceTransitionMatrix = (s*I-A)^-1 phi =...

約4年前 | 2

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Cumulative sum in Simulink
The Discrete-Time Integrator block can be configured as an accumulator.

約4年前 | 1

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How do I construct the dft response of hanning window
Hi Sahil, The code doesn't show the values of N and T used, so I'll make up my own. N = 64; % T = 1; Changed the next line s...

約4年前 | 0

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質問

Does surf() Behave as Expected with ndgrid() Inputs?
Define a function clear f = @(x,y) x; Case 1: square mesh, meshgrid, vector inputs to surf x = 0:5; y = 100:105; [Xmesh,Ym...

約4年前 | 1 件の回答 | 0

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Calculate convolution of two given continuous signals in matlab
Closed form solution using symbolic math syms t tau real f1(t) = rectangularPulse(-5,5,t); f2(t) = exp(-t)*heaviside(t); y1(...

約4年前 | 1

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Why does MATLAB (Symbolic Math Toolbox) not integrate this simple function.
syms x a real I = int(simplify((1-x^2/a^2)^(3/2)),x,-a,a)

約4年前 | 0

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Behavior of isPassive and hinfnorm.
Hi Siva, I'm not able to load the .mat file, so can't really look at the problem. load('https://www.mathworks.com/matlabcentra...

約4年前 | 1

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Question on use of fft and using positive frequency values only
Is this just an indexing question? If I understand the code snippet correctly, the frequency vector starts at 0, and incremente...

約4年前 | 0

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How do I solve a symbolic system for a certain vector?
Hi Vitor, To make sure I understand the question, it assumes that a rigid body can have a constant, non-zero angular velocity v...

約4年前 | 1

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Adding a delay in state space form
The command sys=ss(A,B,C,D,'InputDelay',theta,'OutputDelay',0); puts a delay on the input signal, i.e., at the output of the a...

約4年前 | 0

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DFT amplitude differs from CFT amplitude
Hi An, A couple of issues with the code, addressed below. T_ech = 5E-5; y = [0 0 0 0 0 1 1 1 1 1 1 1 1 1 0 0 0 0]; t = [T_ec...

約4年前 | 0

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Step response and Impulse response of IIR filter
Hi Alex, It would be helpful to know the value of temp. Absent that, it seem like [hstep,tstep] = stepz(sos); hstep = hstep*...

約4年前 | 0

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Incorrect Integrator Behaviour Simulink
It looks like the input sine wave is sin(2*pi/2*t) = sin(pi*t) The output of the integrator should be -1/pi*cos(pi*t) + C B...

約4年前 | 1

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Change the size of a log in simulink
Double click the ToWorkspace block and increase the Decimation parameter. If you really need all of the data, maybe something m...

約4年前 | 0

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Designing an Observer - Control System
I don't think you're going wrong anywhere (though you might want use size(Aa,1) instead of length(Ca) in a few places). I think ...

約4年前 | 0

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Plot a 2D Gaussian prior
Something like this? mu = [1 1]; Sigma = [1 .7*1*sqrt(2); .7*1*sqrt(2) 2]; [X,Y] = meshgrid(-2:.1:4); p = mvnpdf([X(:) Y(:)]...

約4年前 | 0

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質問

Is exp() a Documented Function in the Symbolic Math Toolbox?
I can't find it.

約4年前 | 3 件の回答 | 0

3

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adding a communication delay in simulink
Try using the LTI System block.

約4年前 | 0

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Calculate convolution of two given continuous signals in matlab
Assuming a closed form solution is desired this problem can be solved with the Symbolic Math Toolbox syms rectangularPulse in...

約4年前 | 2

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Why do the eul2quat and quaternion functions differ on the calculated results?
Hi cui, I think that both eul2quat and quaternion('frame') are using, right-handed, intrinsic rotations and the sequence of rot...

約4年前 | 1

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roots(x) vs root= interp1(y,x,0)
The query points in x are spaced too far apart for the linear interpolation used by interp1 to be accurate relative to the actua...

約4年前 | 0