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E+ and Matlab Error - Error using table (line 335) 'XOutputNameX' is longer than the maximum allowed length for a table variable name.

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Zakaria OUAOUJA
Zakaria OUAOUJA 2023-3-30
编辑： Zakaria OUAOUJA 2023-3-31
Hi everyone!,
I am trying to performe a co-simulation between E+ and Matlab using the "EnergyPlus Co-simulation Toolbox" and I tried to an output and the error bellow appears.
_______________________________________________________________________
Error using table (line 335)
'EP_ZN__Refrigeration_Air_Chiller_System_Total_Compressor_Electric_Energy'
is longer than the maximum allowed length for a
table variable name.
Error in mlepMatlab_example (line 41)
logTable = table('Size',[0, 1 + ep.nOut],...
________________________________________________________________________
This is line 41 :
nRows = ceil(endTime / ep.timestep); %Query timestep after mlep initialization
logTable = table('Size',[0, 1 + ep.nOut],...
'VariableTypes',repmat({'double'},1,1 + ep.nOut),...
'VariableNames',[{'Time'}; ep.outputSigName]);
iLog = 1;
How can I solve this problem ?

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回答（1 个）

Steven Lord
Steven Lord 2023-3-30
Ran in:
The maximum length a table variable name may have in MATLAB is namelengthmax.
namelengthmax
ans = 63
The name you're trying to use has length:
strlength('EP_ZN__Refrigeration_Air_Chiller_System_Total_Compressor_Electric_Energy')
ans = 72
You will need to use a shorter name, perhaps by abbreviating Refrigeration to Fridge and Electric to Elec?
strlength('EP_ZN__Fridge_Air_Chiller_System_Total_Compressor_Elec_Energy')
ans = 61
  1 个评论
Zakaria OUAOUJA
Zakaria OUAOUJA 2023-3-31
编辑：Zakaria OUAOUJA 2023-3-31
Thank you @Steven Lord for your comment.
The output variable name is defined by EnergyPlus and I can not change it.
Is there any way to change it when imported to MATLAB.
% Prepare data logging
nRows = ceil(endTime / ep.timestep); %Query timestep after mlep initialization
% Logging Table
logTable = table('Size',[0, 1 + ep.nOut],...
'VariableTypes',repmat({'double'},1,1 + ep.nOut),...
'VariableNames',[{'Time'}; ep.outputSigName]);

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