Answered
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...

25 dagar ago | 1

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Answered
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...

25 dagar ago | 0

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Answered
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...

26 dagar ago | 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 = ...

26 dagar ago | 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 ...

27 dagar ago | 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...

28 dagar ago | 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...

29 dagar ago | 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...

30 dagar ago | 0

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Answered
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...

30 dagar ago | 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...

30 dagar ago | 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'...

30 dagar ago | 0

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Answered
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...

30 dagar ago | 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(:)...

ungefär en månad ago | 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...

ungefär en månad ago | 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...

ungefär en månad ago | 0

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Answered
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...

ungefär en månad ago | 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 ...

ungefär en månad ago | 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. ...

ungefär en månad ago | 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...

ungefär en månad ago | 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...

ungefär en månad ago | 1

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Answered
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 ...

ungefär en månad ago | 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...

ungefär en månad ago | 1

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

ungefär en månad ago | 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...

ungefär en månad ago | 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(...

ungefär en månad ago | 0

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Answered
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 ...

ungefär en månad ago | 0

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Answered
Trying to use central difference scheme to solve logistic equation
Well run your code line-by-line and figure out what the problem is. This is what you let us know about your script (My comments...

ungefär en månad ago | 1

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How to calculate jacobian matrix for R^n X R^n system in matlab
Maybe this illustration of how to reshape your variable x and function f from n-by-n to n^2-by-1: syms x [2,2] % a small n-by-n...

ungefär en månad ago | 0

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Plotting 2 functions on the same graph
Skip the calls to subplot? That would make your scrip "not put the graphs in 2 separate axes": x1 = Pos1(t); x2 = Pos2(t); ph...

ungefär en månad ago | 0

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Answered
How does Matlab uses memory inside a function?
Matlab is very clever in memory usage in functions, pass-by-reference-copy-on-modification. So as long as you only take values o...

ungefär 2 månader ago | 0

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