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**Content Feed**

Having trouble with lsqcurvefit for a heat transfer experiment.

@Nate, The plot below shows the measured data (red *), and the predicted temperature profile with h=150, 2000, and -4000. It s...

en dag ago | 0

Method used by fitnlm to estimate coefficients

@Alex, By default, fitnlm() minimizes the sum squared error. It uses the Levenberg-Marquardt algorithm to find its way downhil...

2 dagar ago | 0

| accepted

implicit numerical method: 1-D unsteady state heat transfer using finite difference method

@Joydeep Bagchi, I think you need to divide the long term (u(i+1,n)-2*u(i,n)+...) by 2, on the right side of your Crank-Nicolso...

4 dagar ago | 0

Interpolating data to get values at specific depth

@Luís Henrique Bordin, x=(0:10); y=(0:11)'; z=[1.0, 2.3, 5.6, 8.3]; % vectors x,y,z [X,Y]=meshgrid(x,y); %Make data() with de...

5 dagar ago | 1

How to find out the amplitude and duration of a sine wave of different amplitudes?

@A Lumbini, If you must use wavelets, do a continuous wavelet transform (cwt). THe Matlab documentation is good. Make a 50 Hz s...

7 dagar ago | 0

How to find out the amplitude and duration of a sine wave of different amplitudes?

@aswathy, @A Lumbini, I would not use wavelets. , I would use stft(). Make a signal which is 3 seconds long. The frequency is ...

8 dagar ago | 0

Which optimization tool should be used for solving my convex optimization problem?

@KAGANA SARATH, I agree with @Torsten: try fmincon. It allows you to specify linear and nonlinear equality constraints and ine...

8 dagar ago | 0

Plot the first-order autocorrelation functions for the following light sources: perfect monochromatic source, a thermal lamp((Lc=1 μm, a led =100 μm), lasersLc=1 m and 1 km

@OMEIR HUSSAIN, [Edit: fix spelling errors.] You can format your code as code, by highlighting your code, then click the "Code...

10 dagar ago | 0

Box plot function help

@Benjamin Wilson, Others cannot run the code you supplied, since we don;t have singlepricingprogrammenew(), and I'm not suggest...

10 dagar ago | 0

Sharpe ratio in Report

@jorge cogno, [edit: the 0 in the equation below is for the risk free rate] "RiskFreeRate=0 TotalReturn=0.22943, SharpeRatio=0...

10 dagar ago | 0

how can I create a simple clutter model?

@Kerem Yüksel, [edit: fix spelling errors] [Edit 2: My initial implementation had an exponential distribution of clutter radi...

11 dagar ago | 0

| accepted

How do I find the most stable N consecutive numbers?

@Ali Almakhmari, How about this: x=rand(1,2500); n=50; stdx=zeros(1,length(x)-n+1); % allocate array for stdev(x(i:i+49)) f...

11 dagar ago | 0

| accepted

Comparing Finite difference method answer with analytical for 2d plate heat transfer

@Christopher, [Edit: add a line of code to display the maximum temperature for each value of N.] Another excellent answer fro...

12 dagar ago | 0

how to plot eigenvector calculated from eigs from the matrices created by freefem++

@AMIT, quiver() is good for 2-D vectors; quiver3() for 3D. For an example, I will use the magic square matrix, but I could us...

16 dagar ago | 0

how get the range from FFT on FMCW radar data

@Simeon, You need to specify exactly what the signal that you have consists of. It could be the received signal mixed with a re...

17 dagar ago | 0

How to plot a linear function?

@Jenni, [edit: Fix typo: change "values at" to "values are"] It looks like you want to plot measured data as well as the best-...

21 dagar ago | 0

| accepted

Why the calculated phase differs so much from the real phase of the signal?

@Janko, The DFT expresses a signal x(k) as a sum of sinusoids, each of which is sampled at regular intervals. The phase angles...

23 dagar ago | 2

| accepted

Create a node in the space between two nodes (A and B) and following the direction normal to a node (N)

@Alberto Acri D=(A+B)/2; % the location E=cross((A-B),(N-D)); % the direction good luck

23 dagar ago | 0

How to solve this function?

@Ramesh, I am not sure what you mean by "how do you solve this function". You have posted a function. par=struct('A',1,'E',2,...

23 dagar ago | 0

Solving 2d heat problem using meshgrid

@Ali, [edit: fix spelling erors] A 10x10 mesh for this problem is so few points that it makes it hard to set up the problem an...

24 dagar ago | 0

| accepted

How to reduce \t commands

@TheSaint, Hard to say, since we don't know what F and SC and E are. You use the word table. Have you used Matlab's T=table...

26 dagar ago | 0

Advice on formulating a minimization function

@Collin Pecora, If you want to use multiple sources of data, with different levels of measurement error, to estimate parameters...

27 dagar ago | 0

| accepted

looped 3D FFT of 4D data

@sbr, P2 is 64x64x64. P1 is 1x33. Your plot shows that one column along one corner-edge of the cube P2 is zero. But P2 is not...

29 dagar ago | 0

Plot a Probability Density Function in 3D

@Victor Carneiro da Cunha Martorelli, For a one-dimensional random variable, you could do the Kolmogorov-Smirnov test, or the A...

29 dagar ago | 0

Detect boundaries seperating data blocks in a time series signal

@Ashley, I am actually very impressed that findchangepts() did so well. I recommend adjusting the optional arguments of findch...

29 dagar ago | 0

How to get the value of X-axis at the -3dB

@Chris, There is no guarantee that H(f) will = -3 dB at one of the frequencies at which you evaluate H(f). Therefore, since it ...

29 dagar ago | 1

| accepted

Special case of spectrogram not match FFT

@John, There are many ways to normalize a spectrum. Mathematicians like to have a factor 1/sqrt(n) in the forward and reverse ...

30 dagar ago | 0

Fourier transform spatial domain-DSP

@Nimasha Pilippange, Matlab's fft() will work fine on spatial data. The only difference is in the interpretation of the transf...

30 dagar ago | 0

| accepted

two signal one is original signal i.e. pulses and other is receiving signal with a noise. finding the delay in signal by using the cross correlation.

@Mahesh, The error above occurs if you pass a non-integer scalar value for receiver_signal, because a scalar is interpreted as...

ungefär en månad ago | 0

How to find fitting optimized parameters to fit a system of non-linear ODEs to experiment.

@Buhari Ibrahim Matlab has excellent tools for this. https://www.mathworks.com/help/optim/ug/optimizing-a-simulation-or-ordina...

ungefär en månad ago | 2