# Paul

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**Content Feed**

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...

4 Tage 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 ...

9 Tage 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...

11 Tage 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 ...

11 Tage 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...

12 Tage 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...

12 Tage ago | 0

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...

13 Tage 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 ...

13 Tage 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 ...

14 Tage ago | 1 answer | 0

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answerTo 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...

16 Tage 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)...

18 Tage ago | 1

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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...

21 Tage 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...

21 Tage 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.

22 Tage 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...

22 Tage 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...

24 Tage ago | 1 answer | 0

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answerHow 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 ...

26 Tage 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...

27 Tage ago | 0

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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...

30 Tage ago | 0

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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)...

etwa ein Monat 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...

etwa ein Monat 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)...

etwa ein Monat ago | 1 answer | 0

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answerEmpty linear analysis workspace after linearising model

linsys1 isn't empty. It's a static gain of zero. Double click the Derivative block. If the Parameter ("Coefficient c ....") i...

etwa ein Monat ago | 0

| accepted

Euler's method code

The code that is posted solves a differential equation of the form y'(x) = f(x,y), y(0) = y0 and compares it to the exact solu...

etwa ein Monat ago | 0

Finding curve length of vector r(t)=<2t, t^2, 1/3t^3> Given0<=t<=1

It looks like the equation for "magnitude" is incorrect Why is magnitude the sqrt of the sum of the squares of each individual ...

etwa ein Monat ago | 0

How to explicit a matlab equation by using the symbolic toolbox?

Looks like there are two solutions for V based on reasonable assumptions: syms rho V CD0 K W S T positive syms gamma real eqn...

etwa ein Monat ago | 0

| accepted

diff function rearranges symbolic expression leading to non-vanishing terms

Why not just use collect() and coeffs() on the elements of dxdt? If the system is affine in u, then those should give the desir...

etwa ein Monat ago | 1

| accepted

DC gain discrete-time transfer function error

I think the problem is just inaccuracy of the numerical computation of the freuqency response at very small frequencies. Keep i...

etwa ein Monat ago | 0

| accepted

Roots of a polynomial with variables

Don't know the scope of the actual problems of interest, but for the two examples in the question: syms x y sol = solve(3*x*y ...

etwa ein Monat ago | 0