# Paul

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**Content Feed**

Effect of zero padding on FFT amplitude

This thread started with one question about zero-padding the Discrete Fourier Transform (DFT) and the answers and comments broug...

1 hour ago | 0

Pass input timeseries and block values into the sim command

Hi Yevgeniy Use a Simulink.SimulationInput object. More generally start from Run Simulations and follow the doc pages from ther...

3 hours ago | 0

How to give a vector as input in Simulink, to solve a system of differential equations ?

Use a 1-D Lookup Table block with a Clock connected to its input. Use the y-array and its corresponding times to specify the ta...

6 hours ago | 0

How to join matrices of different lengths into one mother matrix

Hi Joanne, If you want to store different size arrays in a single data structure you probably should consider using a container...

8 hours ago | 0

| accepted

Simulink Goto block to a constant value

Connect a Constant block to the input of the Q_ave1 Goto block? If that's not the solution, please clarify what the goal is and...

10 hours ago | 0

How can I put conditional setting (if/else) on switch case block in Simulink?

Hi Gabryella, Please clarify the question. This logic: case 1 - if u1 >=20 case 2 - elseif u1 <= 20 works when u1 is a sca...

1 day ago | 0

solve - unable to find explicit solution

Hi Alexei, Try to use isolate instead of solve to get an expression for X(s). Also, make sure to take the ilaplace of X(s), no...

2 days ago | 0

How to generate a set of gaussian noise signal with zero mean and say 'x' variance and measure their covariance?

Check out normrnd, mvnrnd and cov. If you try those, or anything else, and can't get the code to work, feel free to post back s...

2 days ago | 0

Monte Carlo simulation with two random variables with correlation

Because Qd and Qg are normal, perhaps mvnrnd is all that's needed.

2 days ago | 0

| accepted

The 'ss' class does not support code generation.

Hi Bavly, The only two lines in that function (it would be better if you pasted in text, rather than a screen capture) that are...

3 days ago | 0

| accepted

use compose caculate piecewise fun

Hi jin, Perhapse I misunderstand the question, but the results all seem to be functionally equivalent. syms x f(x)=piecewise(...

4 days ago | 0

Is there a way to get MATLAB Function name defined in Simulink block programmatically ?

Finding the function line is easy because it's the first line that starts with "function". Just need to deal with the different ...

4 days ago | 1

| accepted

Problem with undefined function

logncdf is a function in the Statistics and Machine Learning Toolbox. That toolbox needs to be installed and it will have to be...

7 days ago | 0

Solve 1D equation in simulink

Hi gdz, Assuming vpasolve needed because a closed form solution can't be found .... Can always try using an Algebraic Constrai...

8 days ago | 0

| accepted

How to simply rearrange a symbolic equation to get an expression for one variable in terms of others

Not sure about solve, but isolate seems to work syms x(t) a eqn1 = x(t) == a + x(t)/2; isolate(eqn1,x(t))

8 days ago | 0

| accepted

Extract operations from symbolic expression

Hi Cedric What's the objection to using a Matlab Function block? If that wasn't a constraint, you could use matlabFunctionBlock...

9 days ago | 0

A question about SkyHogg model in Aerospace Blockset

Hi Islam I agree with your equation for alphadot, but not the notation. By standard convention (at least what I'm familiary wit...

9 days ago | 0

How to solve optimization problems when the objective function includes a symbolic function

Hi @NJ2Cali I was able to get fmincon to run to completion using an objective function that uses syms. I changed Func2 to some...

10 days ago | 0

How to interpret results of FFT/DFT?

By my calculations, if that sine wave is supposed to be 4.82 kHz, then the sampling frequency must be Fs = 1928000 Hz and the ...

10 days ago | 0

Why results of the 'solve' are wrong?

Hi ruiheng, I would stay out of the double world to first make sure everything is working as expected. p_max=715.685424949238;...

10 days ago | 1

Inverse Laplace plot error

Hi PTK, f1 is a symfun, so you could use fplot, or you could evaluate it at bunch of points and convert to double and the use p...

11 days ago | 0

How to speed up a 2D interpolation in MATLAB?

A single call to interp2 should do the trick Position0 = 1:4; Velocity0 = 1:5; Output0 = Position0.' + Velocity0; RawPositio...

11 days ago | 0

| accepted

Question

Should sinc() be Implemented with sinpi()?

Here are the relevant lines that implement sinc dbtype sinc.m 24:27 Should line 26 now be implemented with sinpi? If concerne...

12 days ago | 1 answer | 0

### 1

answerFRD MIMO plant closed loop control, incorrect response

Define the controller fs = 5000; ts = 1/fs; g = 0.5; wp = 76.9*2*pi; d = 0.3; den = [1/wp^2 2*d/wp 1]; Ctot = tf({0 0 0 0...

12 days ago | 0

periodogram for 200 Hz sample rate returns 129 array length

Hi sam, signal = linspace(0,3000,200)'; %this is 1 second of my signal (200 because that's the sample rate) [x,y] = periodogra...

12 days ago | 1

| accepted

simulink add block wrong output

Hi 기범 I think the issue here is mixing together different fixed point data types. Using R2021b Here's the model, with the data...

13 days ago | 0

Generating signal from weibull distribution

Hi Davide, The functions wblpdf and wblrnd are both eligible for code generation, so you can call either from inside a Matlab F...

13 days ago | 0

Block callback function in Simulink model cannot access workspace variable when executed with parsim

Hi David, I think there is relatively straightforward solution to the original Question (I realize you found an alternative sol...

14 days ago | 0

Area in a normalpdf

x1 = [-4:.1:4]; y1 = normpdf(x1,0,1); x = [-4:0.1:-1.5]; plot(x1,y1) hold on area(x,normpdf(x,0,1)) See area for options ...

14 days ago | 0

| accepted

Trouble with MuPad when evaluating symfun at a symbolic variable instead of a number in MATLAB

Hi Nathaniel, I too could not figure out how to specify cond2 the way you want. A workaround would be to only specify cond1, a...

15 days ago | 0

| accepted