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How can I sort a string both alphabetically and numerically?
Very ugly, but works: UnsortedText = {'BBB 1'; 'AAA 10'; 'AAA 9'; 'AAA 1'; 'BBB 2'; 'BBB 19'; 'BBB 9'; 'CCC 0'; 'CCC 9' ;...

más de 13 años hace | 6

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solid contour lines for some specific values of a contourf plot
The userdata property of each patch is set to the level's value. You can use this to find the relevant patch, and make its line ...

más de 13 años hace | 0

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can you plot a image? (line by line or pixel by pixel)
One idea would be to use the AlphaData property. This sets the transparency of each pixel: A = im2bw(rand(10,7)); M = ze...

más de 13 años hace | 1

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Finding distance between point and edge of image mask
I think what you are looking for is the BWDIST function. help bwdist

más de 13 años hace | 1

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Need help - How to generate predefined subsets?
Another idea: [C1,C2,C3,C4] = ndgrid(1:5); allCombinations = [v(C1,1) v(C2,2) v(C3,3) v(C4,4)] Or a more flexible way...

más de 13 años hace | 0

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Vectorization in an array of structures?
Not sure there's an easy way to do that. There is this, but I don't see much benefit over using a loop. N = num2cell([S....

más de 13 años hace | 0

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Extracting points from an interpolated surface (Lowess fit)
You can directly call your FIT object with the points you want to evaluate. Like this: fitresult(3,4) fitresult([1 2 ...

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Analytically and numerically computed arc length
I'm not sure how you are analytically calculating path length. It seems from your expression that you just integrated r(t) strai...

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Imposing additional constraints while using 'lsqnonneg'
I think this should work. If you are minimizing ||Cx - d|| First, remove the first and last columns of C, and call LSQNON...

más de 13 años hace | 1

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Numerical approximation of projectile motion with air resistance
You are forgetting to update v inside your loop. v = sqrt(vx^2 + vy^2); Right now it is sitting at v = 50 the whole time. ...

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how plot results of a 3d matrix
These two commands shoulds be useful: help isosurface help slice

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Simple Solve command not working.
When you use solve with a string input, it interprets the "E" as exp(1). Try this: solve('x = E', 'x') If you really wa...

más de 13 años hace | 1

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Multivariate Regression Parameter Optimization
NLINFIT is good. NonLinearModel.fit is also good. But since your problem involves fitting a surface with only two indepe...

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Correcting a Non-Uniform Background
One example that uses morphological operations is here: <http://www.mathworks.com/products/image/examples.html?file=/products...

más de 13 años hace | 0

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Deleting duplicate images in 3-dimesional matrix
%First, I'll make some sample data with some duplicates: A = rand(200,200,50); A(:,:,16) = A(:,:,41); A(:,:,32) = A(:...

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remove sidewalls from surface plots
There are several ways, for example by replacing points with NaN, but they often give mixed results as far as appearance. The co...

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Numerical Solution
Ok, your "q" will have an imaginary component, so you cannot use fzero directly. You can, however, solve it using fsolve, where ...

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How to convert easily *.mat files to *.m files
Do you happen to have Simulink? There is the "Simulink.savevars" command that will write variables into a readable MATLAB script...

más de 13 años hace | 4

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Programmatic polynomial fitting with mutliple measurements and known parameters
If I understand this correctly, you want model something as y = f(x1,x2,x3,x4), where f is a polynomial of some sort. You hav...

más de 13 años hace | 1

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How to keep aspect ratio fixed, when rotating 3D objects in GUI?
Maybe this will do what you are trying to accomplish? axis vis3d

más de 13 años hace | 6

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Find Min& Max Togather
The Neural Network Toolbox actually already has a function to do this called MINMAX. It calculates the min and max of each row o...

más de 13 años hace | 0

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compute determinant using Cholesky decomposition
You could try prod(diag(chol(A)))^2 But I have no idea if/when this would be faster than simply det(A).

más de 13 años hace | 0

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System of three differential equations
So you have experimental data (S(t),I(t), and R(t)), and you are trying to find the parameters (a and r) that will make the ODE ...

más de 13 años hace | 0

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Graph a plane spanned by 2 vectors
The way you are calliing EZMESH inteprets the input as z = f(x,y). So you can't express things like the x=0 plane. But what y...

más de 13 años hace | 1

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Recommendations for evaluating a 6-D Integral
Assuming that "gamma" and "psi" are the same thing, are you sure your integrand is correct? Look at when theta = psi = pi/2...

más de 13 años hace | 0

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Recommendations for evaluating a 6-D Integral
Here's a simple idea. If your integrand is more or less smooth. Evaluate it on a number of different coarse grids, and then extr...

más de 13 años hace | 0

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Curve Fitting
As proecsm points out, your data needs to be made into columns. Like this: x = 1:1000; %Row vector y = sin(0.01*x) + cos...

más de 13 años hace | 1

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dsolve problem
One way would be to convert f to a string: syms x y f f=x y=dsolve(['D2x=-' char(f)],'x(0)=1','Dx(0)=0')

casi 14 años hace | 1

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Trouble Evaluating an Integral
If you are using R2012a, you can try using INTEGRAL3 In any case, since you are integrating in spherical coordinates, you nee...

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Eliminating Imaginary Numbers in an Array
Array = [-1/8 -1/16 0 1/16 1/8]; NewArray = nthroot(Array,3)

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