Neural net default error: "Default value is not a member of type "nntype.distance_fcn"."

Question

Emily 2014-2-18

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/116659-neural-net-default-error-default-value-is-not-a-member-of-type-nntype-distance_fcn

编辑： Emily 2021-1-11

I have not used any neural net programs before, and am trying the built-in neural net example called "Simple Clusters" via the Gui App. When I load the example data, and choose the default 10 neurons, I get this error:

Default value is not a member of type "nntype.distance_fcn".

As far as I know, I have not changed any default settings, the distanceFnc is still the default "linkdist", which exists in my path. Any suggestions would be appreciated. Thanks,

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Greg Heath 2014-2-20

Show relevant code and error messages

Jipei Chen 2020-1-9

I also encountered the same problem. Is there any solution currently? Is it a source code issue?

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Answer 1

Greg Heath 2014-2-25

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https://ww2.mathworks.cn/matlabcentral/answers/116659-neural-net-default-error-default-value-is-not-a-member-of-type-nntype-distance_fcn#answer_125987

在 MATLAB Online 中打开

1. Review

   a. doc selforgmap
   b. help selforgmap

2.What happens when you cut and paste the help example with each of the following alternatives:

 net = selforgmap;
 net = selforgmap( [8 8]);
 net = selforgmap( [8 8],100,3,'hextop',linkdist' );

Hope this helps

Greg

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Emily 2014-2-25

在 MATLAB Online 中打开

Thanks again. I tried these with the same results as the first. I have read the doc and help, and done multiple google searches to try to understand. I purchased and installed the neural net toolbox several months after the rest of matlab, maybe I will reinstall so all toolboxes are recognized from the beginning.

>> net = selforgmap;
Default value is not a member of type "nntype.distance_fcn".
Error using nnetParamInfo (line 28)
Not enough input arguments.
Error in selforgmap>get_info (line 88)
  info = nnfcnNetwork(mfilename,'Self-Organizing Map',fcnversion, ...
Error in selforgmap (line 44)
  if isempty(INFO), INFO = get_info; end
>> net = selforgmap( [8 8]);
Default value is not a member of type "nntype.distance_fcn".
Error using nnetParamInfo (line 28)
Not enough input arguments.
Error in selforgmap>get_info (line 88)
  info = nnfcnNetwork(mfilename,'Self-Organizing Map',fcnversion, ...
Error in selforgmap (line 44)
  if
   isempty(INFO), INFO = get_info; end
>> net = selforgmap( [8 8],100,3,'hextop','linkdist' );
Default value is not a member of type "nntype.distance_fcn".
Error using nnetParamInfo (line 28)
Not enough input arguments.
Error in selforgmap>get_info (line 88)
  info = nnfcnNetwork(mfilename,'Self-Organizing Map',fcnversion, ...
Error in selforgmap (line 44)
  if isempty(INFO), INFO = get_info; end

Greg Heath 2014-2-26

在 MATLAB Online 中打开

Why don't you cut and paste the examples in

help fitnet

and

help patternnet

to see if the NNTBX works at all

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Answer 2

Monique 2016-3-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/116659-neural-net-default-error-default-value-is-not-a-member-of-type-nntype-distance_fcn#answer_214007

编辑：Monique 2016-3-17

In case someone ends up here after googling the issue like I did, since I am afraid Greg's answer was not particularly useful... What happened in my case (and what may be the issue for you as well) was that I had a function in my path, conflicting with the toolbox - in my case a dist.m I wrote a long time ago and had forgotten about. So you might want to check whether there is a dist.m in your path.

If not, run net = selforgmap; right when launching a "clean" version of matlab with no personal directories added to the path. If it works, add paths in your directories one by one (addpath/rmpath) until you narrow down which one causes the function to fail, and then narrow down to the function... (since I had no idea what I was looking for, once I found the directory I had to remove functions from it until I found which one was the culprit). Hope it helps!

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Sinan Islam 2021-1-11

Thanks alot Monique. I had a function called dist.m

Honestly, I find it a bit weird that matlab core functions and toolboxes functions do not have their own namespace. Also, I am not sure if matlab have the concept of Environments. Anyhow, I renamed the function and the issue was fixed.

Emily 2021-1-11

编辑：Emily 2021-1-11

Yes, thanks Monique! I have a function dist.m, too! The problem disappeared when I worked on a version matlab without any of my personal paths installed. (@Sinan Islam) thanks for bumping this up!

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Answer 3

Greg Heath 2014-2-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/116659-neural-net-default-error-default-value-is-not-a-member-of-type-nntype-distance_fcn#answer_125972

If you can't figure it out, try the command line approach and keep my comment in mind.

Hope this helps.

Thank you for formally accepting my answer

Greg

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Emily 2014-2-24

在 MATLAB Online 中打开

Thanks for your answer, but I have tried on the command line, too and get the same error, although a bit more information on the error.

>> net = selforgmap([8 8]);
Default value is not a member of type "nntype.distance_fcn".
Error using nnetParamInfo (line 28)
Not enough input arguments.
Error in selforgmap>get_info (line 88)
  info = nnfcnNetwork(mfilename,'Self-Organizing Map',fcnversion, ...
Error in selforgmap (line 44)
  if isempty(INFO), INFO = get_info; end

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Answer 4

Daniel Perez Rapela 2018-10-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/116659-neural-net-default-error-default-value-is-not-a-member-of-type-nntype-distance_fcn#answer_343222

I just found the solution here: https://www.mathworks.com/matlabcentral/answers/339194-error-in-feedforwardnet-default-value-is-not-a-member-of-type-nntype-training_fcn#answer_266546