ERROR in feedforwardnet (Default value is not a member of type "nntype.training_fcn".)

Question

Marimuthu Ananthavelu 2017-5-7

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/339194-error-in-feedforwardnet-default-value-is-not-a-member-of-type-nntype-training_fcn

评论： An 2024-7-6

Why do I receive the following error when Tried to run the example:

This is my full code : Line 22 is the line with 'trainbr'.

clear
clc
close all
% With Noise
%
%%%%%%%%%%%
%algorlm.m
% A script comparing performance of different algorithms
% traingd - batch gradient descent 
% trainlm - Levenberg - Marquardt
% traingda
% traincgf
% traincgp
% trainbfg
%%%%%%%%%%%
%generation of examples and targets
x=0:0.2:4*pi;
y=sin(x);
p=con2seq(x); t=con2seq(y); % convert the data to a useful format
%creation of networks
net1=feedforwardnet(20,'trainbr');
net2=feedforwardnet(20,'traingd');

The error is :

Default value is not a member of type "nntype.training_fcn".
Error using nnetParamInfo (line 28)
FCN does not return an info object.
Error in feedforwardnet>get_info (line 87)
    nnetParamInfo('trainFcn','Training Function','nntype.training_fcn','trainlm',...
Error in feedforwardnet (line 39)
  if isempty(INFO), INFO = get_info; end
Error in backpropag_noisydata (line 22)
net1=feedforwardnet(20,'trainbr');

Its just the given example which I try to run. But still it just throws me an error figuring out looks difficult.

5 个评论
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Marimuthu Ananthavelu 2017-5-21

I use the same version and it happens only sometimes. (R2017a).

Walter Roberson 2017-5-22

I have not been able to reproduce this in R2017a on OS-X

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Answer 1

Wilson A N 2017-5-11

2
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/339194-error-in-feedforwardnet-default-value-is-not-a-member-of-type-nntype-training_fcn#answer_266546

在 MATLAB Online 中打开

I was not able to reproduce the issue at my end. But, I suspect that this behavior is caused due to a path issue or due to one or more default functions being shadowed.

Can you please execute the following commands in MATLAB command window

>> restoredefaultpath
>> rehash toolboxcache

Since this looks like an issue with the MATLAB search path, "restoredefaultpath" will try and reset it to the default path. This command sets the search path to include only folders for MathWorks installed products.

Using the "rehash" command updates the MATLAB list of known files on the search path.

Please execute the script and check if the issue still persists.

More information on "restoredefaultpath" and "rehash" are found in the following link:

https://www.mathworks.com/help//matlab/ref/rehash.html

https://www.mathworks.com/help/matlab/ref/restoredefaultpath.html