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Khanh


自 2011 起处于活动状态

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统计学

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Genrate all combinations of a vector
I have a vector of size n, whose each element can be an integer in the range from 0 to k. I need to generate all possible vari...

13 years 前 | 0 个回答 | 0

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Find integer root in a given range of an equation
Given an equation $\sum_{i=1}^{n} C_{ij}*(x_i - k_i)^2 = R$ with C is a covariance n*n matrix of vector x; R and vector k is g...

13 years 前 | 1 个回答 | 0

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Plotting 3d sphere from equation
Another way I can think of is using 'ellipsoid'. It will be like this: [x,y,z] = ellipsoid(a,b,c,R,R,R); surf(x,y,z); ...

13 years 前 | 0

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Plotting 3d sphere from equation
I'm looking for a way to plot a 3d sphere given its equation. Eg: (x-a)^2 + (y-b)^2 + (z-c)^2 <= R I found that 'sphere'...

13 years 前 | 2 个回答 | 0

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Is there known relationship between eigenvalues of covariance matrix and correlation matrix?
I've tried to google but didn't find anything talking about it. My intention is that if I have found the eigenvalues of the co...

13 years 前 | 1 个回答 | 0

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Find max/min eigenvalue of a symmetric matrix
I know I can use eig() to find all eigenvalues as well as eigenvectors and then use max/min to find the max/min eigenvalues. H...

13 years 前 | 2 个回答 | 0

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n-dimensional plotting in Matlab
So, I have n-dimensional vector x=(x1, x2, x3,...,xn) and a function of vector x: f(x) which is the result of mathematical opera...

13 years 前 | 3 个回答 | 0

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How to generate a random positive semi-definite matrix of certain size with real numbers in a certain range?
I'm looking for a way to generate a *random positive semi-definite matrix* of size n with real number in the *range* from 0 to...

13 years 前 | 1 个回答 | 0

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