This bug has been fixed in Release 14 Service Pack 3 (R14SP3). For previous product releases, read below for any possible workarounds:
This has been verified as a bug in the Neural Network Toolbox 4.0.2 (R13).
The problem occurs due to input data variables being saved as cell arrays within a MAT-file. You can verify this by loading the variables to the workspace using the LOAD function.
As a workaround you can either:
1) Save the inputs to the workspace, and then use the SAVE function in the MATLAB command window.
2) Save the inputs using the "SAVE to MAT-file" button within the NNTOOL GUI. Load the variables to the MATLAB workspace using the LOAD function. Finally, use the CELL2MAT function to convert the cell array into double arrays.
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