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2D data fit lsqcurvefit with NaN in grid
You could try doing this with lsqnonlin: x = [1 2 4 6 8 10 13 17 21 25]; y = [0.2 0.5 1 2 4 7 10 14 18 22]; z =[1,0.6844,0.30...

3年以上前 | 0

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Calculation of consistent initial conditions for ODE
@Fabio Freschi, OK, now we're at least in the same general region of worrying. If I read decic correctly the use of the QR-outpu...

3年以上前 | 1

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How to plot 3D suraface and contour lines?
To effectively use matlab sometimes one has to make functions vectorized - such that you can feed the function arrays and get al...

3年以上前 | 0

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help code with lsqnonlin
At the very least you'll have to make Nest into a function - otherwise you have nothing to optimize. Perhaps something like this...

3年以上前 | 0

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Could you please help me generate following function and solve the integral?
To calculate the area under a curve specified by numerical arrays (x and y) you can use trapz: A = trapz(x,y); % Or in your c...

3年以上前 | 1

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Custom fitting using equation from differential function
Use matlabFunction to make a function out of the symbolic solution, then fit that one numerically to your data: R_a_fcn = matla...

3年以上前 | 0

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Double parameter optimisation using optimisation toolbox
The standard fitting method I use is: % Your curve-function definition (I just mock one up, if you have it defined in a % mat...

3年以上前 | 0

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legend for multiple plots
Use the outputs from plot to explicitly control what is show in the legend: x=1:15 ph1 = plot(x,res540,'-r'); hold on ph2 = ...

3年以上前 | 0

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The contour function requires Z=f(x,y); I have measured data for X,Y, and Z that are not related with a function. I get errors when I use Z as a X:1 array
You will have to look at the scatteredInterpolant or TriScatteredInterp and possibly also its related griddata functions, check ...

3年以上前 | 0

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ismember(a, b) function problem
The ismember function checks if elements in a are found in b, not that each element match. In your case both "1" in a have a val...

3年以上前 | 0

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Generate nchoosek vectors line-by-line
There are loads of nchoosek functions available on the file exchange: nchoosek. Some of those should help you with this. I recal...

3年以上前 | 0

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Parameter Estimates for Ordinary Differential Equation
Solve the ODE analytically. That will give you an expression for T(t,c1) this you can then use for a standart non-linear least-s...

3年以上前 | 0

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3D Polar Plot
A quick search on the file exchange leads to these submissions:pcolor-in-polar-coordinates, 3d-polar-plot and polar-contour-plot...

3年以上前 | 0

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Struggling trying to create a 2-D contour plot from a large data set from x and y coordinates and corresponding frequency value
Wouldn't something like this do: % Mock-up of data similar to yours... x = linspace(-5,5,501); y0 = linspace(-2,2,201); [x,y...

3年以上前 | 0

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Add legend for a specific plot
Explicitly use the handles returned from the plotting-functions: legend([l1(:);l2(:);l3(:)],'text1_1','text1_2','and','so','on'...

3年以上前 | 0

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Solve differential equation from Matlab
For a numerical integration of this ODE look at the help and documentation for ode45 and its siblings, also look at the examples...

3年以上前 | 0

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How to smoothen contourf plot to make it look better
Best way (probably) to go about making your contourlines smoother is to interpolate your data: Xi = linspace(min(X(:)),max(X(:)...

3年以上前 | 0

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variable number of if condition
Maybe something like this: for i = min:max %:columns b = 1; d = 1; f = 1; for a = 1:length(Ex) for i_c...

3年以上前 | 0

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Why does this code generate a mix of integers and doubles?
In practice you can look on this problem as "good luck" and "bad luck" when it comes to working and not working. The rounding of...

3年以上前 | 0

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Remove noise from the image
First start by trying standard filtering-methods. Compare what you get with 2-D median-filter (medfilt2), and Lee's sigma-filter...

3年以上前 | 0

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Function GUNZIP was unable to read URL ''http://opihi.cs.uvic.ca/sound/genres.tar.gz''.
If the file doesn't exist then nothing will be able to read it. I wouldn't bother using gunzip, I'd go for straight downloading ...

3年以上前 | 0

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True north-based azimuths
Your question doesn't make much sense, sure you can do that - but that would be more of "establishing" your azimuth-convention. ...

3年以上前 | 0

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Incorrect dimensions for raising a matrix to a power
Just set a debug-stop in that function and check what dimensions your variables have: dbstop in gaussh Or just at the point wh...

3年以上前 | 0

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Filtering the large precipitation data for finding rainfall events
If you store your rain-fall-data in an array, r_f for rain_falls, with n_t rows and n_stations columns you could easily do thing...

4年弱前 | 1

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How to fit regression
This is not a polynomial, therefore you cannot use polyfit. You can seamlessly use any least-square fitting routine to fit your ...

4年弱前 | 0

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curve of best fit
In order to get a function that has two y-values for for some range of x-values you will cannot fit a polynomial such that y=p(x...

4年弱前 | 1

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how can compute a marginal distribution?
Look at the help and documentation for the histogram-function. Possibly also check the histogram2. HTH

4年弱前 | 0

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Solving a system of linear equations with lots of o coefficients.
Matlab is designed to solve systems of linear equations. It is one of the fundamental operators of its matrix-algebra: % Your p...

4年弱前 | 0

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Reading and analysing files in subfolders - indexing
Why not skip the generation of FileName and index into files directly inside the loop: dt = 0.005; tt = 0:dt:60; files = dir(...

4年弱前 | 0

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Trajectorys of 4 objects on 3D plane not symmetrical
Your main problem (or rather: step to take) is that you do the calculations element-by-element in the different arrays. That is ...

4年弱前 | 0

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