Using exported classifer model

Hi everyone,

I wonder if anyone out there can assist. I am learning to use the classification learner app in Matlab2015a. I generated some 'toy' data with 2 columns, choosing column 1 as predictor and column 2 as the response. 1 trained the CosineKNN classifer on this toy data and exported my model. I would now like to make some predictions using some new data.

When I exported the model I got the following messages

Variables have been created in the base workspace.
To use the exported classifier 'trainedClassifier' to make predictions on new data, T, use 
  yfit = predict(trainedClassifier, T{:,trainedClassifier.PredictorNames})

If your new data contains any integer variables, then preprocess the data to doubles like this:
  X = table2array(varfun(@double, T(:,trainedClassifier.PredictorNames)));
  yfit = predict(trainedClassifier, X)

So I ran the code below on a vector called toytestdata and got the following

Error using numel
Bad subscripting index.

Error in toyscript (line 9)
yfit = predict(trainedClassifier, T{:,trainedClassifier.PredictorNames})

Here is my code

% code
% Variables have been created in the base workspace.
% To use the exported classifier 'trainedClassifier' to make predictions on new data, T, use 
%   yfit = predict(trainedClassifier, T{:,trainedClassifier.PredictorNames})
% 
% If your new data contains any integer variables, then preprocess the data to doubles like this:
%   X = table2array(varfun(@double, T(:,trainedClassifier.PredictorNames)));
%   yfit = predict(trainedClassifier, X)

    T=toytestdata
    yfit = predict(trainedClassifier, T{:,trainedClassifier.PredictorNames})
      end

My questions are

1.Is my input data in the right format.?

2. Do I need to change the PredictorNames field in my code. I note that this is listed as column_1 in the model.....is there any way to change this..

3. Do I need to do anything else to get this running.

Thanks very much for your help. I attached a few pictures which may assist..

Have a nice weekend

Kevin

Answer 1

[Walter Roberson]

To match that code, your T needs to be a table with column named "column_1" (the same as the predictor name)

[KB]

Thanks very much Walter. All working and my headache is beginning to dissipate now I have stopped banging my head against a brick wall.... much obliged and enjoy your weekend. Kevin