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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' ;...

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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 ...

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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...

casi 14 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

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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...

casi 14 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....

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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...

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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...

casi 14 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...

casi 14 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...

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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...

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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

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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...

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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).

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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 ...

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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...

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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...

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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...

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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...

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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')

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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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