# Paul

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**Content Feed**

Error using sym/subsindex when doing convolution of two signals (cosine function and impulse function) in MATLAB.

As written, h is Stem object. However, to use int, h(t) needs to be defined as a symbolic function of t (in the same manner as x...

ongeveer 18 uur ago | 0

Find unique column values in NxN cell array

Because the resulting variables could all have a different number of elements, I'm converting each variable into a scalar cell t...

4 dagen ago | 0

Interpolation of cross-correlation from zero padded idft of power spectrum shows odd behavior

Hi matt, I think the issue is with how the padding is being done. See code below for that and other questions. Full disclosure:...

4 dagen ago | 0

| accepted

how to plot a periodic function?

Hi Zafer, To compute the Fourier series, you really only need to define one period of the function, because the defining integr...

5 dagen ago | 0

| accepted

How to get z transfer function from difference equation?

Hi Vivianne, One workflow would go like this: Define the variables and signals. Note that x is a function of k syms y(k) z x(...

6 dagen ago | 0

Sliding mode control simulink

Hi KAI, Do any of the integrators have a non-zero initial condition? Also, might want to consider using a variable step solver...

7 dagen ago | 0

| accepted

Having symbolic in a Matrix

Hi Felis, I didn't run the code because I don't know what inputs to provide. Does changing Z2 to a sym object solve the problem...

10 dagen ago | 0

| accepted

Find a specific characters in a string

Hi Miriam I'm not quite sure what you're looking for. However, transforming everything to strings might offer a path forward vi...

10 dagen ago | 0

How to find index of string inside a structure of cell arrays

Hi Andrew, Is this what you're looking for? load(websave('MyStruct.mat','https://www.mathworks.com/matlabcentral/answers/uploa...

10 dagen ago | 0

| accepted

Display Block shows truncated data

Hi Gajana, The warning is not telling the full story and may actually be incorrect. Fron the Display block doc page: "The Disp...

11 dagen ago | 0

How to find number of input and output ports of an unknown simulink model ?

Hi Shiv, I started out with this model with three subsystems. Then I ran this code: % Handles to the subsystems subsystems...

12 dagen ago | 1

| accepted

How to find cumulative distribution function from a given data set(vector)

Hi Shankul, I'm not sure what "I want the cdf vector" means. If that means the data that forms the cdf plot on the graph, then ...

12 dagen ago | 0

| accepted

Problem passing sine wave through if statement

Hi Matthew, The "Port 1" referenced in the error message is the first output port, not the input port. All output ports from th...

12 dagen ago | 0

| accepted

What is the physical interpretation of sos in Zp2sos function?

Hi Andi, Addresing the second part of your question: " why we need to do this" filtfilt will accept either transfer function (...

13 dagen ago | 0

why does my data kick up at the end after doing ifft(X)

Hi Joanne It will be easier for people to help if you post the data. Use the paper clip icon to attach it to your question as a...

13 dagen ago | 0

How to vectorize a complex function?

Hi Babak, Here is a one line solution. Whether or not it's more efficient/effective/clearer than the loop is an open question. ...

13 dagen ago | 0

Reduce length of sum of products of symbolic variables

Hi Moritz, Would you mind explaining why it's necessary to get the expression into a particular form? Recreating the expressio...

14 dagen ago | 0

| accepted

Not able to use the if condition as desired in simulink

The outputs of an If block can only drive If-Action subsystems. At a minimum, the limiter blocks need to be wrapped inside If-Ac...

15 dagen ago | 0

Plotting the frequency response of a bandpass filter around a frequency fc

The code as implemented uses the form of freqz with the w input in normalized frequency in units of rad. The w vector on input r...

15 dagen ago | 1

| accepted

How do I use methods from a class that works in matlab and use it in simulink?

How will the object instances be used in Simulink? This blog post and its follow-ups may be of interest.

15 dagen ago | 0

| accepted

Is there a zpk block in simscape?

Zero-pole-gain block in Simulink, don't know if there is a specialized or alternate version in Simscape.

16 dagen ago | 1

| accepted

Offset in filtered data when using filtfilt() Function

Thanks @Jan The filter, d, does not have unity gain at dc. fc = 0.4; d = designfilt("lowpassfir", 'PassbandFrequency', fc, 'S...

16 dagen ago | 1

complex ifft output for hermitian input

Hi Md. I didn't inspect the whole code, but did notice that the calcuation of timeResp seemed to have the ifft/ifftshift operat...

17 dagen ago | 1

| accepted

How can I evaluate a complex definite integral?

Hi Valentin, Shouldn't the lower bound on the integral be fg2, not 0? Don't see how the reult will be 0.2952. The integrand is ...

17 dagen ago | 1

| accepted

minreal tolerance not respected

Hi Daniel, As best I can tell after sifting through the code, tol is generally compared to the distance between the zero and po...

17 dagen ago | 1

Energy and Power of a Piecewise Function

Hi Iakovos, Try using piecewise to simplify things. syms t real x(t) = piecewise(-3 <= t <= 0, cos(sym(pi)*t),0 < t <= 2, 2, ...

17 dagen ago | 1

| accepted

DC gain for FIR high-pass filter using fir1

Hi Masao, Let's try the proposed methods. High-pass fir1 filter bhigh = fir1(500,5/750,'high'); [h0,w] = freqz(bhigh,1,0:.00...

18 dagen ago | 0

| accepted

Plotting sin (x/x) function in terms of Mag(dB) over Frequency

Hi IFECHUKWU, sin(x)/x can take on negative values, for example x = 5*pi/4; sin(x)/x Taking the log10 (as neeed for dB, not ...

18 dagen ago | 0

| accepted

DSP/IIR filter butterworth

Hi Steven, Here is the original code (with minor changes) fpass = 2500; fstop = 4000; As = 95; Rp=3; fs=44100; %Data wp=(fpas...

19 dagen ago | 1

| accepted

nonlinear variable state space observer pole placement

Hi Bernd, Matlab assumes by default that all sym variables are complex, and this assumption can sometimes lead to unexpected re...

19 dagen ago | 1

| accepted