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Ben Petschel


Last seen: 3 months 前 |  自 2009 起处于活动状态

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已回答
How to order values within a cell array more efficiently??
The following should work regardless of the ordering of the two rows: [~,idx] = ismember(ratings(1,:),ratings(2,:)); ord...

11 years 前 | 2

| 已接受

已回答
Approximate vertex cover problem
Assuming you've got an incidence matrix A with A(u,v) if there is an edge from u to v, then a random edge could be selected with...

11 years 前 | 0

| 已接受

已回答
How can I make the negative output values of the linprog optimization to be treated as if they was positive when optimizing a problem?
If you need to minimise something like abs(x), just replace x with y-z so your objective becomes to minimise y+z with y>=0 and z...

11 years 前 | 1

已回答
2nd order ODE with variable coefficients
You'll need to rewrite the second-order ODE as a first-order vector ODE. Put y1=y, y2=y1', so y2'=y''. Try ode45, with f = ...

11 years 前 | 0

| 已接受

已回答
Making fmincon display function argument at each iteration
The utility <http://www.mathworks.com/matlabcentral/fileexchange/44120-peek PEEK> on the file exchange can be used to tell you w...

11 years 前 | 0

已回答
how plot complementary cumulative density function (CCDF) of data points?
If you have the stats toolbox: ecdf(data,'function','survivor') will plot the CCDF.

11 years 前 | 1

已回答
probability of a run of k heads or more in N tosses of a fair coin N>>k
The method in the link you gave can be modified to avoid the need for arbitrary-precision integer arithmetic in calculating the ...

11 years 前 | 0

已回答
Genetic Algorithm - Fitness function value differences...
An alternative way to record the evaluated points is with the utility <http://www.mathworks.com/matlabcentral/fileexchange/44120...

11 years 前 | 0

已回答
how to output interval spacing from quad, quadl or quadgk?
The utility <http://www.mathworks.com.au/matlabcentral/fileexchange/44120-peek PEEK> on the file exchange is useful for this sor...

11 years 前 | 0

已回答
Variance in Ornstein Uhlenbeck process
That's an interesting method, though it's not obvious to me how it works and I couldn't see any reference to it in the planet ma...

12 years 前 | 0

提问


calculate tangent of 1e100
How do you calculate trig functions with very large arguments? For example, in "Surely you're joking, Mr Feynman", Richard te...

12 years 前 | 1 个回答 | 0

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提问


Is the new Cramer's rule algorithm really as good as LU?
The Wikipedia article on Cramer's rule cites a recent paper that claims to have an O(n^3) algorithm: Ken Habgood and Itamar Are...

13 years 前 | 0 个回答 | 0

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个回答

已回答
Block diagonalize a matrix
It turns out to be easier than I thought. Given V such that A*V=V*E we find any W such that [W,V] is invertible and if A*W = W*...

13 years 前 | 0

提问


Block diagonalize a matrix
Given a square matrix A and a rectangular matrix V, how do we find a complement U such that [U,V]\A*[U,V] is block diagonal? Fo...

13 years 前 | 1 个回答 | 0

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已回答
What is missing from MATLAB?
1. Distinguishing variable from function names in M-Lint. To get around the current limitation, "declare" which names are varia...

13 years 前 | 7