Neural network error: 'model' parameter must be a string when calling sim(net,data)
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Mark
el 14 de Ag. de 2012
Editada: Rina Blomberg
el 15 de Mzo. de 2015
Hello,
I have seen other people have had this problem too - http://www.mathworks.de/matlabcentral/answers/1925-model-parameter-must-be-a-string-error but am unsure how to correct so I apologize in advance only this is acting weird.
I want to save the network to a file so I can (hopefully) use it in a aspx.NET application. When the I call sim(net,data) without saving to a file then it works, when I save it to a file I get the error:
Error using nn1 (line 34)
'model' parameter must be a string
I am using R2012a and am unsure what to do. Following the advice of others in previous versions of this problem I have found the following *when loading from the file*:
>> which sim
built-in (C:\Program Files\MATLAB\R2012a\toolbox\simulink\simulink\sim)
when I *don't* load from the file I get:
K>> which sim
built-in (C:\Program Files\MATLAB\R2012a\toolbox\simulink\simulink\sim)
any help will be gratefully appreciated
Mark
clearvars -global;
a = xlsread('c:\\CS Data\\ScoringValidation1.xls');
a(isnan(a)) =0;
data = a(:, 2:size(a,2)-2);
data = data';
targets = a(:, size(a,2)-1:size(a,2));
t = targets';
net = patternnet(10)
net = train(net,data,t);
view(net)
y = net(data);
perf = perform(net,t,y)
classes = vec2ind(y)
save 'c:\\nn\\net' net
net = load('c:\\nn\\net'); % ***when I use this I get the error when calling sim(net,data1)
% test to see if it works...
data1 = [9,1];
data1(1) = 75;
data1(2) = 75;
data1(3) = 0.06;
data1(4) = 0;
data1(5) = 1;
data1(6) = 0;
data1(7) = 1;
data1(8) = 0;
data1(9) = 8;
data1 = data1'
sim(net,data1)
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Respuesta aceptada
Walter Roberson
el 15 de Ag. de 2012
Use the extended version of "which" to provide an argument:
which sim(net)
The question becomes what class "net" is when it is created, and which class it is after the load operation.
12 comentarios
Walter Roberson
el 17 de Ag. de 2012
Ah... I didn't realize you were deploying this. If I had, I would have suggested the %#function approach much earlier. Oh well.
Más respuestas (1)
Rina Blomberg
el 15 de Mzo. de 2015
Editada: Rina Blomberg
el 15 de Mzo. de 2015
My answer may not be related to this specific question, but it may help anyone searching for this particular error message when attempting to use the function sim() after having saved and loaded a trained neural network.
The trained network is saved as a .mat file. Eg:
save([path 'net.mat'], 'net');
If for example, this network is then loaded in another script:
net = load([path 'net.mat']);
and then one attempts the follwing code:
results = net(testdata); or results = sim(net, testdata) ;
Then MATLAB outputs the following error (respective to the function used above): Subscript indices must either be real positive integers or logicals or 'model' parameter must be a string
The reason for the error in this particular scenario is because the network has been saved in a struct array. To access the network for simulation you must write: importvariablename.savedvariablename . For example, if using the variable names from above the network must be properly accessed by writing:
results = net.net(testdata); or results = sim(net.net, testdata);
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