Answered
End of function slow - Matlab Profiler
Pretty sure you'll find it's the overhead for the function call

7 years ago | 0

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Answered
Fit and Plot Gaussian Function
Sure, rather than trying to fit a distribution (which is not what you want), just fit the Gaussian itself. Generate some nois...

7 years ago | 0

Answered
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...

7 years ago | 0

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

7 years ago | 0

Answered
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...

7 years ago | 0

Answered
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...

7 years ago | 0

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

7 years ago | 0

Answered
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...

7 years ago | 0

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Answered
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...

7 years ago | 0

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Answered
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...

7 years ago | 0

Answered
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...

7 years ago | 0

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Answered
finding turning points of a dataset
Why don't you look for local maxima of curvature? This way you don't have to define any subjective tolerances. You may need to s...

7 years ago | 1

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

7 years ago | 0

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

7 years ago | 0

Answered
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 ...

7 years ago | 0

Solved


Determine if input is odd
Given the input n, return true if n is odd or false if n is even.

7 years ago

Answered
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...

8 years ago | 0

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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...

8 years ago | 0

Answered
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...

8 years ago | 0

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Solved


Tic Tac Toe FTW
Given a tic tac toe board: * 1 represents X * 0 represents empty. * -1 represents O It is X's move. If there is an imme...

8 years ago

Answered
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...

8 years ago | 0

Solved


The Hitchhiker's Guide to MATLAB
Output logical "true" if the input is the answer to life, the universe and everything. Otherwise, output logical "false".

8 years ago

Solved


Check if sorted
Check if sorted. Example: Input x = [1 2 0] Output y is 0

8 years ago

Solved


Weighted average
Given two lists of numbers, determine the weighted average. Example [1 2 3] and [10 15 20] should result in 33.333...

8 years ago

Solved


Pizza!
Given a circular pizza with radius _z_ and thickness _a_, return the pizza's volume. [ _z_ is first input argument.] Non-scor...

8 years ago

Solved


Find the sum of all the numbers of the input vector
Find the sum of all the numbers of the input vector x. Examples: Input x = [1 2 3 5] Output y is 11 Input x ...

8 years ago

Solved


Eliminate unnecessary polygon vertices
Suppose you have an n-point polygon represented as an n-by-2 matrix of polygon vertices, P. Assume that the polygon is closed; t...

8 years ago

Answered
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 /...

8 years ago | 0

Answered
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: ...

8 years ago | 0

Answered
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 = [...

8 years ago | 0

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