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**Feeds**

2D Fourier transform- problems with the shift

Hi nathan, It is a bit more inconvenent but you can reconstruct using a shifted grid as you did. I kept that method in in the ...

4 dagen ago | 0

| accepted

How to find indices of resampled values from the indices of the original values?

Hello Mibang, Rather than snew = resample(s,fsnew,fs) I think it's safer to use [snew tnew] = resample(s,t,fsnew) because t...

10 dagen ago | 1

fft and ifft of signal seem to cause time reversal

Hi sgreess, I'm guessing your input signal is a column vector. In that case the command spectra = spectra' by Matlab conven...

13 dagen ago | 0

| accepted

How to fit this model with a Weibull distribution?

Hi MIchele, One possibility is that you are not fitting the correct statistical function to the data. The algebraic expression...

ongeveer een maand ago | 0

Problem with integration: there is a pole on a contour

Hi SB You can use the principal value for the integration,which is defined as (1/2) * [ (integral with path on one side of the...

ongeveer 2 maanden ago | 1

| accepted

Generalised solution to a n-order system of equations

HI Aden, Here is a method that produces, within 4.5 %, the experimental value a_1 = 2.518. The equation is (for simplicty n-1 ...

ongeveer 2 maanden ago | 1

| accepted

Solve more complex problems in matlab

HI OF, y(x) = (m-2)x^2 -3mx + (m+2) The domain of m where the two roots have opposite sign is a numerical question and I think...

2 maanden ago | 0

How can I scale and plot the graph according to the formula I use?

Hi Zaref, One thing for sure about eq.(19) in the attachment is that eps0 can't be in the numerator. eps_m is dimensionless (a...

2 maanden ago | 0

Plotting Complex Functions.

Hello Sudharsana, Do you mean f(t) = exp(-ar/(twC))*exp(-ai/(twC)) or f(t) = exp(-ar/(twC))*exp(-i*ai/(twC)) ...

2 maanden ago | 0

How to apply orientation constraints between two rigid bodies

Hi Aiden, because of the parallelism there are only two degrees of freedom here (assuming that one pivot point is the hole nea...

3 maanden ago | 1

How to generate white noise signal from a given PSD?

One can just create the desired waveform that has psd = S0 without resorting to S/N. The example below has a crazy large unphys...

3 maanden ago | 0

How can I replace the upper off diagonal(super diagonal) and lower off diagonal(sub diagonal) of a matrix?

Hello Olawale m = rand(5,5) m1 = diag(m,1) % original upper diagonal a = [2 3 4 5]' % new upper diagonal elements mn...

3 maanden ago | 1

double and triple integral for a complex function. I coded but did not get any output

Hi Orpita, Here is a way to at least reduce the dimension of the integral from 5d to 3d. First of all, the quantity (x+1/2) se...

3 maanden ago | 0

Logarithmic trendline equation of data

Hello Cem, As has been mentioned you can use the curve fitting toolbox for this job, but if you don't have it you can try a sim...

3 maanden ago | 0

| accepted

How change two columns with 5 rows to a single row?

Hi Bajdar, xy = [x; y]; z = xy(:)' i.e. concatenate x and y vertically, read that matrix out columnwise, then take the transp...

3 maanden ago | 0

| accepted

Hi, I am applying findpeaks function to find the peaks of an oscilloscope signal but in the peak plot graph it is automatically changing the x-label with a large difference.

Hi Rikita, if you use findpeaks(y,x) where x is the x axis (linear or log scale) whose min and max match the oscilloscope trace ...

4 maanden ago | 0

Why such a fuss with ndgrid and meshgrid issues?

Hi Kristoffer, I totally agree that Mathworks should use nonsquare examples in the documentation for meshgrid, ndgrid, surf etc...

4 maanden ago | 1

How do I find the phase for a periodic cos wave using fft?

Hi Noam, here is a version using time and frequency in the usual manner. A couple of ponts here. If you construct a grid as y...

4 maanden ago | 0

| accepted

how to write the right code to measure the elapsed time of this method d1 = diag(1./diag(A))

Hi Amna, A common way to do this is with tic and toc. So: a = rand(1e4,1e4); tic b = diag(1./diag(a)); toc Elapsed time...

4 maanden ago | 0

using polyval with one of the polynomials of a spline obtained with the unmkpp command, the results do not overlap! Why?

Hello TH,. spline polynomials are local to the secgment in question starting from x = 0, so if an interval is, for example 3 to...

5 maanden ago | 1

| accepted

Multiplication of submatrices of a matrix

Hi Laura, if I interpret this correctly, you have n rows (I'll use small letters mostly) of the form Anew = [c c*b1 c c*b2 ...

5 maanden ago | 0

| accepted

matrix inverse results different between r2023b and 2021b

Hi QL. you called both the inverse matrices '2021b' so I called the first one F and the second one S (and the orginal matrix is...

5 maanden ago | 0

| accepted

How do I get rid of these weird lines in the surf plot?

Hello Max, It appears that the GetRectGrid function creates points whose order is imcompatible with the reshape functions that ...

5 maanden ago | 1

| accepted

Error in ode45 solution

Hello PS, Assuming the following (before variables get changed around) tv_jk = tv_kj, for all j,k all real de...

5 maanden ago | 0

reproduces the audio signal after sampling!!!

Hello Vu & Paul, < I took a brief look at the Vaidyanathan.paper and although the decimation process seems clear enough, the 'i...

5 maanden ago | 1

Matlab got this wrong: Limit as n goes to infinity: (1+(i/n))^(n^2). Matlab says it's exp(2), which is wrong. Pls confirm.

Hi Moses, not every expression has a limit, or should. That's the case here, as anyone can check. For large n the function zi...

6 maanden ago | 1

Is there a way to create a lot of graphs for a 4D matrix without coding for a ton of individual graphs?

Hi Kitt, Here is one approach. In the example you are using imagsc plots instead of e.g. 1d plots of some state quantity vs. t...

6 maanden ago | 1

| accepted

How can I calculate the integral of associate LegendreP(1,n,theta)*cos(theta)^2 ?

Hello Se, First of all I think you probably mean the integral of P(1,n,cos(theta))*cos(theta)^2 which is what makes sense whe...

6 maanden ago | 0

| accepted

How to solve swallowtail integral

Hello YM, You won't be able to solve this as a closed form function of X,Y,Z but you can find the integral for given values of ...

6 maanden ago | 0

Trying to ubderstand the power distribution in fft plot

Hello Yogesh, The fact that all the abs(peaks)^2 add up to the expected total is just Parseval's theorem and has really nothing...

6 maanden ago | 1