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Surface area from a z-matrix
OK, well how about splitting each quadrilateral into two triangles, and just summing up the areas? I'm sorry there's no way I ca...

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Argmin with several minimums
It doesn't feel very satisfactory, but this will do the trick I = find(A == min(A))

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Projecting Points to a new Basis
I'm not sure what your question is asking because you're missing a symbol off your question. But I think you mean if n is not eq...

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How can I use "symbfact" to speed up several consecutive Cholesky factorizations?
You can't (unless something has changed recently). When I had to do this, I ended up working with the C code in CSparse directly...

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Simple solution to a simple problem
Try 1./(1 + 9*x.^2) i.e. a '.' before the division

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Piecewise Cubic Hermite Interpolating Polynomial (PCHIP)
It works perfectly x = [5.8808 6.5137 7.1828 7.8953]; y = [31.2472 33.9977 36.7661 39.3567]; pp = pchip(x...

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Sparse and nonspare QR
Sorry to take a while, busy week. Neither are wrong. You'll notice that the only difference in the outputs is that the sparse ve...

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Sparse and nonspare QR
On my system they match (up to the signs of the rows, as you'd expect). m = 20; n = 10; X = sprand(m,n,0.3); Rs...

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How to calculate expm of a badly scaled matrix?
You might this Cleve's corner instructive <http://blogs.mathworks.com/cleve/2012/07/23/a-balancing-act-for-the-matrix-exponenti...

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MATLAB Project for Chemistry
How about simulating the Belousov-Zhabotinsky reaction in 2 dimensions? Start by watching some YouTube videos and work from ther...

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How to run multiple different scripts in parallel ?
One way to do it matlabpool open local 4 spmd switch labindex case 1 script1 ...

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Row by column multiplication
There is a built in way to do it quickly if you use sparse multiplication. Essentially, you construct the block diagonal matrix ...

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How to calculate eigen values and eigen vectors of a square matrix without using eig() function?
_"Please tell me algoritm for this."_ * Power Method * Inverse/Shifted Inverse Power Method * QR Algorithm * Jacobi Algori...

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Proper implementation and use of fmincon
I presume [1 2 3 4] and [6 7 8] are sets of possible values for x1 and x2. If your problem is only small, then you can use brute...

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Find Joint Angle for Animation
You are taking the dot products of the wrong vectors! You need to take the vectors emanating from M2. The following should do th...

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Performing Gauss Elimination with MatLab
The function you want is LU [L, U] = lu(K); The upper triangular matrix resulting from Gaussian elimination with partial...

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Attempted to access Pe(7); index must be a positive integer or logical.
Your problem is that |q| and hence |m| are floating point numbers, not integers. in this case the problem is that m = 0.6 /...

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Solving an implicit function, fsolve vs. fzero
How about doing a fixed number of Newton steps for each problem? (not necessarily doing a convergence check) For example: ...

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How do I find common volume of spheres?
Here's how I'd do it (if I was in a hurry). First pretend all the spheres are cubes, and find their intersection. inx = [...

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Problem using 'deal' for objective and gradient in comb. with 'DerivativeCheck'
An internal routine (in this case |finDiffEvalAndChkErr|) is calling your routine with only one output. For a regular function t...

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Minimizing the values in an underdetermined Matrix - minimize with constraints
*edit*: fixed mistake in call to |linprog| To perform L1 minimisation, you'll need access to an LP solver. If you have the op...

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How to change selected data which would give me the line of best fit (R squared close to 1)?
For the first part x(logical(imag(x))) = nan; For the second, your data points are all over the show. Any two will fit a s...

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Initializing vs growing a structure
Let's say you wanted to create a 100x1 struct array with a field |A| that you know will store a 3x3 matrix struct('A', repm...

12년 초과 전 | 4

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Minimizing the values in an underdetermined Matrix - minimize with constraints
Assuming you want a minimal Euclidean norm solution, there's no built-in function, but I can offer you a two-line solution: ...

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How to maximize this function: x1^2+x2^2+...+xn^2 ?
I assume you mean minimise rather than maximise, because unless you have |n| independent constraints, your problem is unbounded....

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Can linprog give an integer value of x's?
No there isn't. Integer linear programming is a different beast. Perhaps this one from the file exchange might help: <http://...

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How to output matlab ode dependent variable at same time step as T and Y?
By far the best way is to compute your dependent variable _afterwards_ with the |y| matrix that was computed by the ODE solver. ...

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how to construct an affinity matrix?
This might be helpful <http://www.mathworks.com/matlabcentral/fileexchange/26354-spectral-clustering-algorithms>

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