Community Profile

photo

Paul


Last seen: Today Active since 2011

Statistics

All
  • Thankful Level 3
  • Knowledgeable Level 4
  • Pro
  • 12 Month Streak
  • Revival Level 1
  • First Answer
  • Solver

View badges

Content Feed

View by

Answered
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= ...

5 jours 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...

5 jours ago | 0 answers | 0

0

answers

Answered
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...

6 jours ago | 0

Answered
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...

7 jours ago | 1

| accepted

Answered
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^...

7 jours ago | 0

Answered
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 = ...

8 jours ago | 0

Answered
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...

8 jours ago | 0

Answered
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...

8 jours ago | 0

| accepted

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...

8 jours ago | 0 answers | 0

0

answers

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

9 jours 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...

9 jours ago | 1 answer | 0

1

answer

Answered
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...

9 jours ago | 0

Answered
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...

10 jours ago | 0

| accepted

Answered
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...

11 jours ago | 0

| accepted

Answered
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...

11 jours ago | 1

| accepted

Answered
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...

11 jours ago | 0

| accepted

Answered
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...

12 jours ago | 1

| accepted

Answered
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...

13 jours ago | 0

| accepted

Answered
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...

14 jours ago | 0

Answered
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...

14 jours ago | 2

| accepted

Answered
How do you use ode45( ) when the equation is not in dy/dt form?
Check out this link ....

15 jours ago | 0

Answered
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)) - ...

16 jours ago | 0

Answered
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'}; ...

16 jours ago | 0

| accepted

Answered
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::...

17 jours ago | 0

| accepted

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(...

17 jours ago | 0 answers | 0

0

answers

Answered
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...

17 jours ago | 0

| accepted

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...

17 jours ago | 1 answer | 0

1

answer

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

18 jours ago | 0

| accepted

Answered
answer different on MATLAB than the expected answer
Mathematically, the answers are the same because the Ci are abitrary constants (absent any othe conditions on the solution). So...

18 jours ago | 2

| accepted

Answered
Fourier Series for thin airfoil theory
From the equation it looks to me that y is scalar function and the independent variable x is also a scalar. Are xcam and ycam b...

18 jours ago | 0

| accepted

Load more