Community Profile # Paul

Last seen: Today Active since 2011

#### Statistics

All
• • • • • • • #### Content Feed

View by

How to get the coefficients of a fractional polynomial from syms?
If I correctly understand this comment (and I'm not sure I do), it sounds like you just want the coefficients of the numerator o...

22 hours ago | 0

How can I get the correct spectral phase variations of a super gaussian pulse?
The posted code doesn't run. The frequency vector f is defined in terms of numel(X), but X isn't defined yet. I thing that intr...

2 days ago | 0

using of ss2tf command
In my opinion, that statement in the documentation doesn't make sense. It should say "... returns the Laplace transform of the ...

3 days ago | 0

| accepted

Simulating Gamma distributed RV's using Matlab
For starters, probably shouldn't use inline. Use an anonymous function instead. And I'm going to change the variables involved ...

3 days ago | 0

| accepted

what is root of a equation in s(laplace domain) in response of ilapalace means
If ilaplace can't find a closed form expression it returns the result in terms of "root," which can then be evaluated numericall...

4 days ago | 0

| accepted

How to obtain FFT of nonuniformly spaced data?
You can try using the tspan input to od15i to specify equally spaced sample points in time at which the solution is desired. Che...

5 days ago | 0

Different frequency responses using [z,p,k] method and [b,a] for 2nd order elliptical filter
If fvtool is like freqz, you need to make sure that the sos input has more than one row. Otherwise, the input might not be inter...

10 days ago | 1

how to change line colors in bodes, nichols, nyquist, etc
I tested stepplot and bodeplot and am seeing the same thing as you, i.e., if more than 7 responses, then multiple responses are ...

15 days ago | 0

Does order of multiplication really matter when using simplify ?
I suspect that in the first instance the term 1/(2*pi) is first evaluated numerically, and then the result in coverted to symbol...

17 days ago | 1

| accepted

Problem with mvncdf - returning NaN
The limits of area of integration defined in xl and xu are way, way, out in the tails of the density function, which may be why ...

17 days ago | 1

| accepted

how to do symbolic type negation ?
Accoding to the doc page for assume(), maybe assume(~in(x,'integer')) will do what you want? I couldn't test it because my ve...

18 days ago | 0

| accepted

How to Find out the port/signal name which is connected to a particular input in a block
Can be done in two steps: signals = get_param(block,'InputSignalNames'); signals{double(string(get_param(block,'Port')))} whe...

18 days ago | 0

| accepted

Plotting the absolute value.
plot(abs(Fx))

18 days ago | 0

| accepted

what are the name of the two components in simulink
The one at the top looks like Bus Selector The one at the bottom is Add You can always right click on a block and click Help t...

19 days ago | 0

CDF of log pearson
Not familiar with the disribution, but can offer the following about this code: % data Q=[23.81 33.98 62.01 140.45 184.91 ...

19 days ago | 0

| accepted

Question

Why Does int() of rectangularPulse Return NaN?
syms t real x(t) = rectangularPulse(0,1,t); int(x(t),t,0,5) int(x(t),t,0,inf) int(x(t),t,-10,10) int(x(t),t,-inf,inf) Any ...

20 days ago | 1 answer | 0

### 1

To Get Correct FFT Result the length(x) must be An Integral Multiple of 100?
The desired plot will be obtained when N, the number of elements of t, is an integer multiple of the ratios Fs/Fn, where Fs is t...

22 days ago | 2

| accepted

How to vectorize this for loop
For starters, why use symsum at all? Doesn't sum() do exactly what is needed? for t = 1:12054 k = 0:(12054 - t); L(t)...

24 days ago | 1

| accepted

Bode Plot's Phase Margin Decimal Precision
If you just want the actual phase (and other) margin to more accuracy and don't care about the pop-up data tip, use doc allmarg...

27 days ago | 0

vector direction calculation in order to remove impact of magnitude
I think you want something like this: mag = sqrt(u.^2 + v.^2); newu = u./mag; newv = v./mag; % now use newu and newv as inpu...

28 days ago | 0

How to model and simulate large nonlinear coupled mechanical systems effectively?
I think steps 2 and 3 can be replaced with: doc odeToVectorField If not, post a simple example to illustrate the problem.

28 days ago | 0

Very small u control values in LQR initial response
For this dicussion, I'm going to just use x and u as the symbols for the state and control variables of the linearized model, in...

28 days ago | 0

| accepted

Question

Is There a Way to Find all Shadowed Functions on the matlabpath?
I'm dealing with a code base of m-files all in one folder and sub-folders. I'm worried that different sub-folders contain files...

1 month ago | 1 answer | 0

### 1

How to solve intergal for analytical form of ambiguity function
I was not able to get Matlab to return a solution in the expected form of the answer. But we can show that Matlab's solution is ...

1 month ago | 0

| accepted

How to determine if a signal in Simulink is within upper and lower limit bounds over a specified number of samples?
I'm going to assume that the signal in question is already sampled. Here's one approach. There are others. Input the signal to...

1 month ago | 0

| accepted

How to define the order of states and inputs of a state space model in Model Linearizer
If using the linearize() function, the inputs and outputs will be in the order specified in the io argument. The state ordering...

1 month ago | 0

| accepted

Is there a better method to plot the inverse Laplace of a function?
The copy/paste approach shouldn't be needed. For many functions, fplot() usually does the trick: syms s t U(s)=1/(s+1); u(t)...

1 month ago | 1

| accepted

Why a function can't get itself in Simulink after two consecutive differentiation and two integration operations？
For the top (continuous) branch, keep in mind that the Derivative block is a numerical approximation and it's output will be ver...

1 month ago | 1

| accepted

Question

Should Behavior of sub2ind() be Different for Symbolic and Numeric Inputs?
maxrows = 1; r = 1; a = 1; c = 1; ii = false; D = zeros(3,3,maxrows) % D is a double D(sub2ind([3,3,maxrows],a(ii),a(ii),r(ii)...

1 month ago | 1 answer | 0