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# Paul

Last seen: Today Active since 2011

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Different vector length on plotting convolution of Hanning signal with Dirac Delta signal
It's easier to make it work if the signals are defined over the same time vector. And use the full convolution. dt = 0.1; xt= ...

13 hours ago | 0

Question

Is the Result from dsolve() Justified for a heaviside() Input?
This question is a follow up to this one that I feel warrants a separate discussion. The problem is ... Solve this differential...

18 hours ago | 0 answers | 0

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errors with musyn -- Plant must have at least <> inputs and <> outputs
The plant model has 4 outputs and 1 input. If you look at doc musyn you'll see that the second (nY) and third inputs (nU) are...

1 day ago | 0

Third Order ODE with unit step input
@Parveen Ayoubi Based on your comments in this thread and what you're trying to do in this question, I think the approach you'r...

1 day ago | 0

Solving an equation with integration constants and boundary conditions
syms sigma_r(r) A B p_2 r1 r2 sigma_r = A - B/r^2 % eqn = sigma_r == 0; % edit: commented out after posting original answer. N...

3 days ago | 1

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solution for symbolic equation: matlab can't find a solution for my equation
Use the ReturnConditions option to see all of the solutions syms x C Mo mom mom1 mus o l J(x) =(4*C*Mo*mom*mom1*mus*sin(o)*(C^...

3 days ago | 0

How to express a variable (function) in terms of specific variables?
syms C_S C_CS C_BS C_C C_P C_B r1 r2 r3 k_A k_A1 k_S k_S1 k_D k_D1 Ct = C_S + C_CS + C_BS r1 = k_A*C_C*C_S - k_A1*C_CS; r2 = ...

4 days ago | 0

How to normalize state variables in ODE45 each timestep.
Some thoughts: a. If you know from the application that you don't have to worry about getting close to singularities, integrate...

4 days ago | 0

Feedin vector in feedback function for mimo systems
Try an example with a known solution. A = -diag(1:4); B = eye(4); C = eye(4); D = zeros(4); sysp = ss(A,B,C,D); sysk = ss(dia...

4 days ago | 0

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Question

How Can I Extract One Period of a Periodic Function that is Defined with Mod() ?
Suppose I have a function, for example syms t real f(t) = triangularPulse(-1,1,t) Now create its periodic extension using mod...

4 days ago | 0 answers | 0

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Output the amount of time it took to run a simulation
Execute simout = sim(…) Then look at simout.SimulationMetadata.TimingInfo

5 days ago | 1

Question

Can't Uninstall, What Should I Do?
Matlab, actually Simulink, was throwing some weird error. So I thought I'd unintall and then do a fresh install (of 2020b). Bu...

5 days ago | 1 answer | 0

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symbolic variables into double array, observability matrix
The function obsv() in the Control System Toolbox only accepts numeric input. If you want the symbolic form of the observability...

5 days ago | 0

Removing path name from Simulink block name
I'm seeing the same thing, though I'm not sure that is correct base on the documentation. And it is certainly a limiting behavio...

6 days ago | 0

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discrete-time real exponential signal
Those points at zero show up because alpha is negative and the code is raising alpha to non-integer powers t. For those values o...

7 days ago | 0

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Converting differential equations to State-Space/Transfer Function representation
There really is no need to use the symbolic stuff (though you can if you really want, at least for part of the problem). Suppose...

7 days ago | 1

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Collect does not do the job
Here is one approach showing step-by-step. Many could be combined. Maybe there is a simpler way? syms y y0 muY(y) dt f=(y*di...

7 days ago | 0

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In the Symbolic toolbox,how to get the results like in the old version
% first example syms x g(x) = 1/(x - x^2); f(x) = int(g(x)) simplify(rewrite(f(x),'log'),100) % as it turns out, f(x) retur...

8 days ago | 1

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how to build a control system with one input and multiple outputs
Here is one approach (there are others), with simple examples tf's for C, F, and G, that you should be able to adapt to your pro...

9 days ago | 0

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Why does using a symbolic function as argument in a function give 'not enough input arguments' error?
There seems to be more f's than is needed. If the first input to bisection from the caller is a symfun, it should be usable dire...

10 days ago | 0

Using symbolic integration: Why does my double integral returns different numerical values depending on integration order?
Comment: I'm not going to use the anonymous functions because, as far as I know, those are invalid inputs to int and I don't kno...

10 days ago | 2

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How do you use ode45( ) when the equation is not in dy/dt form?

11 days ago | 0

Basic Difference Equation Plot
Look carefully at these lines I = zeros(1, 500); I(1) = 50; for t = 2:100 I(t+1) = I(t) + rI * I(t) * (1 - I(t)/f(P)) - ...

12 days ago | 0

Compare two string vectors with same input arguments but different length
If stored in a cell arrary: c1 = {'a','b','c','d','e','f','g','h'}; c2 = {'a','a','b','c','d','d','d','e','e','f','g','h'}; ...

12 days ago | 0

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Plot Fourier Series from a variable
The easiest way would be to use fplot(). Also, use assume() instead of evalin syms x k L n % evalin(symengine,'assume(k,Type::...

13 days ago | 0

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Question

How Can the Output of odetovectorfield be Used
Other than sending to matlabFunction(), how can one use the output of odetovectorfield? syms x(t) eqn = diff(x(t),t,2) + diff(...

13 days ago | 0 answers | 0

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Find non singular transformation matrix
Assuming the goal is as described in this comment, one solution would be: T1 = [0 0 0 0 0 0 1 0 1 0]; T = [T1;null(T1).']; S...

13 days ago | 0

Question

Is the LiveScript Editor Connected to the Base Workspace?
I have a live script that does a bunch of stuff. After the script runs I have some variable from that script in the base worksp...

13 days ago | 1 answer | 0

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Extracting the numeric part from a cell
str = ["injection-0:94577)" "injection-0:94578)" "injection-0:94579)" "injection-0:94580)" "injection-0:94581)" "injection-...

14 days ago | 0

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