How to fix table variable related error?

Question

Sanchit 2023-7-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2000441-how-to-fix-table-variable-related-error

评论： Mrutyunjaya Hiremath 2023-7-27

采纳的回答： Mrutyunjaya Hiremath

I am using the following matlab code

MdlReduced = fitrensemble(XX(:,{'td' 'ssr' 'tp'}),MPG,'Method','Bag', ...

'NumLearningCycles',200,'Learners',t);

But this is giving the following error

Error using ()

Unrecognized table variable name 'td'.

Please suggest me how to fix it?

Sanchit

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Saurabh Chaudhary 2023-7-25

can you provide data for XX? Also look the documentation of fitrensemble.

Sanchit 2023-7-25

Thank you very much for your kind suggestion. I have attached sample data file along with code in previous comment. I request you to kindly have look on it and suggest me how to fix it.

Sanchit

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Answer 1

Mrutyunjaya Hiremath 2023-7-25

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https://ww2.mathworks.cn/matlabcentral/answers/2000441-how-to-fix-table-variable-related-error#answer_1278582

在 MATLAB Online 中打开

Here It is ...

clc;
clear all;
close all;
data = readtable('sample.csv');
X = data(:, 1:end);  
% Get the current variable names
currentVariableNames = data.Properties.VariableNames;
% Define the new variable names (use as many names as you have variables)
newVariableNames = {'d2m','t2m','ev','pev','ssr','ssrd','tp','vpd','rh','gpp'};
% Create a new table with the new variable names
data = array2table(data{:,:}, 'VariableNames', newVariableNames);
t = templateTree('PredictorSelection','interaction-curvature','Surrogate','on', ...
    'Reproducible',true); % For reproducibility of random predictor selections
MdlReduced = fitrensemble(data(:,{'d2m' 'ssr'  'tp'}),data(:,'gpp'),'Method','Bag', ...
    'NumLearningCycles',200,'Learners',t);
%Compute the R2 of the reduced model.
yHatReduced = oobPredict(MdlReduced);
r2Reduced = corr(MdlReduced.Y,yHatReduced)^2

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Sanchit 2023-7-25

Thank you very much for your kind help. It worked well. Can I request you to kindly help me in one more code with same sample input file. I am attaching the code for your kind help.

Sanchit

Mrutyunjaya Hiremath 2023-7-27

Welcome .. :)

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Answer 2

Steven Lord 2023-7-25

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https://ww2.mathworks.cn/matlabcentral/answers/2000441-how-to-fix-table-variable-related-error#answer_1278521

在 MATLAB Online 中打开

You expected for your table XX to contain a variable named td, but it doesn't. If you were trying to adapt another example to your needs perhaps the table in the example had that variable but yours does not. You can check if XX has that variable name:

listOfVariableNames = XX.Properties.VariableNames

Does listOfVariableNames contain 'td'?

ismember('td', listOfVariableNames)

Without seeing how you constructed XX it's difficult to offer concrete suggestions for how to solve the problem. If you read the data in from a file perhaps the file headers were not what you expected them to be? If you constructed that table variable using an expression [like td(:, 1)] instead of a plain variable name [like td] then the table variable would not be named using the variable name. Setting the variable name using renamevars could be an option in that scenario.

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Sanchit 2023-7-25

Thank you very much for your prompt suggestions. I am attaching the matlab code along withsample input file. I request you to kindly have a look on it and suggest me how to fix it.

I appreciate your kind help.

Sanchit

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