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Help using idwt3 - high and low pass filters
Hi there thanks so much for your help so I am trying to use this function on a signal that is 17x17x17 which has gone through th...

11 years 前 | 0

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Help using idwt3 - high and low pass filters
I am trying to use idwt3 on my data after applying soft thresholding but I am not sure how to do this exactly; I used dwt3(x, sy...

11 years 前 | 2 个回答 | 0

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How to decide upon a threshold
I am using the function wthresh to carry out soft thresholding on my wavelet coefficients however, I was wondering if someone co...

11 years 前 | 1 个回答 | 0

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How can I store index number and value from a for loop and a problem with optimization
My problem is two-fold; I am attempting to store the minimum value from each row of a matrix that is 3x4193 in dimensions; ...

11 years 前 | 2 个回答 | 0

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Datasample - is there a normal distribution equivalent?
Hi there, is there a normal distribution equivalent to the function 'datasample' ? I want to subsample 100 points according to t...

11 years 前 | 1 个回答 | 0

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A more complex issue than first thought - undersampling according to the Gaussian distribution
Apologies for asking something very similar to last time but I was wondering if you could help me. I have points on a 17x17x17 ...

11 years 前 | 0 个回答 | 0

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Help using normrnd() to undersample according to the gaussian distribution
I have a matrix which is 2000 by 3 and I would like to select 1000 rows of my matrix according to the gaussian distibution howev...

11 years 前 | 1 个回答 | 0

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已回答
error message when using dwt3
Ahhh I think you're right guys! Thanks so much for the help! Yea when I put in which -all dwt3 it said dwt3 was not found but dw...

11 years 前 | 0

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error message when using dwt3
Hi there I get the following error message when trying to use dwt3. I have used dwt2 successfully but I get the following with t...

11 years 前 | 2 个回答 | 0

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Changing the dimensions of my matrix
Hi there As you prob already know I am using the wavelet toolbox. I am attempting to perfrom the dwt2 on my signal which is ...

11 years 前 | 1 个回答 | 0

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Wavelet toolbox - selecting appropriate low and high pass filters
Hi there! I am fairly new to the study of wavelets and I am currently tyring to use the wavelet toolbox to decompose my MRI s...

11 years 前 | 0 个回答 | 0

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numbering rows and then using these numbers for another vector of equal n dimensions
If I have a matrix for example A = [ 1 2 3; 1 2 5; 0 55 8; 0 0 0; 7 8 9; 4 0 5; 0 0 0] and I have a vector B = [ 1; 2; 3;...

11 years 前 | 1 个回答 | 0

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Wavelet 2D decomposition - how can I input a total varitation constraint to be used in this algorithm?
I asked a very general question about the software last time and i have been using it successfully since thanks to your help :D ...

11 years 前 | 0 个回答 | 0

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Zero-filling matricies but different dimensions
Hi there, I have two matricies A = [1 2 3; 4 5 6; 6 7 8; 11 12 13] and B = [1 2 3; 4 5 6; 11 12 13] and I would like to cre...

11 years 前 | 1 个回答 | 0

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Wavelet decomposition 2D help with software
I am wondering what is the best way to use the wavelet-2D decomposition package? I am trying to compress some MRI images and won...

11 years 前 | 1 个回答 | 0

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normal distribution random sample
I have various points in a 3D space and I want to take a subsample of them according to the normal distribution. I want to take ...

11 years 前 | 1 个回答 | 0

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how to create a transparent sphere
I have created a sphere using the [x,y,z} = sphere() function however, when I go to use alpha(.15) to try and add some transpare...

11 years 前 | 1 个回答 | 0

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colour dependent on the value at a certain point
So I plan to represent some data in terms of a sphere. I want to draw a sphere using my x y and z coordinates which I think I kn...

11 years 前 | 0 个回答 | 0

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problems using slice function
I have been having some problems using the slice function; I am using the following code; x = [-7:1:9] y = [-7:1:9] z...

11 years 前 | 1 个回答 | 0

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2D plot of 3D data
Hi there, I'm not sure how best to go about making a 2D plot of my 3D data. I have calculated FFT of samples at points in the...

11 years 前 | 1 个回答 | 0

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Creating a submatrix from a matrix
I have a matrix for example; A = {1 3 7; 10 1 2; 11 5 9; 12 2 5] (however, mine is much bigger) And I would like to keep the row...

11 years 前 | 4 个回答 | 0

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coordinates of points on a rectangular grid
Hi there I would like to find the coordinates for all lattice points on a 33x33x33 rectangular grid. So I want to have an out...

12 years 前 | 2 个回答 | 2

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FFTN - why do we not specify the variable we wish to carry out the fft wrt?
Hi there, I am attempting to write a code to for DSI. I want to carry out the Fast Fourier transform on my q space signals st...

12 years 前 | 0 个回答 | 0

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