Recent content by DavidLiew

I now using MATLAB to analysis the data with discrete wavelet transform, but I don't know how to choose the best level for decomposition and what type of wavelet to use. Have any method to determine the level and wavelet? Besides, how to choose the suitable thresholding method and noise structure?

I have a time series data, I want to use wavelet transform to de-noise the data and then use neural network to analysis the transform data. However, I quite not understand about the wavelet transform. Can tell me about how to use wavelet transform? How to determine the scale? Is it suitable use...

I need to do it in paper, can not use software to solve.

I got a 5x5 matrix, if use characteristic equation to find the eigenvalues and eigenvectors are very tedious and trouble, so got any method which are easy to calculate?

If got two observation per cell, how do I get Turkey's test for additivity?

If I want shows that \hat{b} is an unbiased estimator for the b where \hat{b} =[SIZE="5"] - \sum ln xi [SIZE="6"]/n f(x)= \frac{1}{b} e(1-b/b)

If Var(Y)=\sigma^2, then Var ( Y2 ) = ?

How to differentiate y = 8 ln x - 9 x with respect to x^2?

How to prove the variance of the t distribution?

How to prove that if A is upper triangular and B is the matrix that results when the ith row and jth column of A are deleted, then B is upper triangular if i<j.

Finally I find it is equal to \sqrt{212}. Am I right?

How to find a ||2w-v||,by giving <v,w> = -3, ||v||=2 and ||w||= 7. Actually I find that it was undefined, I not sure its correct or not, so I need yours to help me thanks.:shy:

How to use green's theorem when the C is oriented clockwise

How to prove that if A is a diagonalizable matrix, then the rank of A is the number of nonzero eigenvalues of A. Thanks and regard.

I can't start to do,I don't know how to start.