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error message when using dwt3

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Bran
Bran 2013-3-28
关闭： MATLAB Answer Bot 2021-8-20
Hi there I get the following error message when trying to use dwt3. I have used dwt2 successfully but I get the following with this function
Undefined function or method 'dwt3' for input arguments of type 'double'.
Error in ==> part1reconstruct at 38 wt=dwt3(Adash,'bior2.4');
What do I need to change the data type to as I have looked at the documents and it does not say!
Thanks again guys :)
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Walter Roberson
Walter Roberson 2013-3-28
Is it possible you are using a version of MATLAB from before dwt3 was introduced? Which one are you using? What does
which -all dwt3
which -all dwt2
show ?

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回答（2 个）

Wayne King
Wayne King 2013-3-28
I think Walter's comment above is right on. dwt3.m should work if you have the Wavelet Toolbox and a version of MATLAB after dwt3.m was introduced (R2010a).
X = randn(10,10,3);
WT = dwt3(X,'bior2.4');
works.
Bran
Bran 2013-3-28
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 dwt2 was!
Was trying to use dwt3 because dwt2 keeps altering the dimensions of my matrix taking a 17x17x17 matrix to 17x17x3 :S
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Wayne King
Wayne King 2013-4-2
If you want to take the discrete wavelet transform of a 3-d dimensional dataset, then yes, you need to use 3-D transform. Are you sure you can use the 2-D wavelet transform on 2-D slices of your data?
Bran
Bran 2013-4-10
No I think you are right I will need to use the 3-D transform.. many thanks for pointing this out to me :)

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