Why can't I import predictor and response variables in neural network fitting app?

Hello.

I'm pretty new to matlab. Whenever i am trying to import predictor variable in my neural network fitting app, the data is being imported to both predictor and response. Saame is happening when I try to import data for response variable. Also the command window is showing an error message.

Warning: Synchronous evaluation of the uiimport function for spreadsheet files will be deprecated in a future

release. Use the asynchronous uiimport syntax instead.

What can I do to fix this?

Answer 1

[Rahul]

The predictors and the responses supports the numeric datatype only. You can go through the following code for your reference.

%% read the fisheriris dataset
% read more about fisheriris dataset here: 
% https://en.wikipedia.org/wiki/Iris_flower_data_set
% The following command loads 150 samples of feature set in variable 'meas' 
% and responses in variable 'species'. The species contains 50 samples of each
% classes viz., "setosa", "versicolor", "virginica".
load fisheriris.mat

%% Convert responses to numeric datatype
species_num = zeros(length(species), 1); % initializing the numeric response variable 
for ii = 1 : length(species_num)
    if species{ii} == "setosa"
        species_num(ii) = 1; % assigning 1 to "setosa" class
    elseif species{ii} == "versicolor"
        species_num(ii) = 2; % assigning 2 to "versicolor" class
    else 
        species_num(ii) = 3; % assigning 3 to "virginica" class
    end
end

Then type "nftool" in the command window and import the data. Now, you should be able to select Predictors as 'meas' and Responses as 'species_num'. Select Observations in Rows.

Addressing the warning Warning: Synchronous evaluation of the uiimport function for spreadsheet files will be deprecated in a future release. Use the asynchronous uiimport syntax instead, https://www.mathworks.com/matlabcentral/answers/75340-xlsread-uiimport-error-at-238 hints that the issue might possibly relate to command line access being blocked at the time. Alternatively, you can switch to in-built commands such as "readtable", or "readmatrix" instead of "uiimport".