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How to normalize data set in MATLAB. If it is csv file .

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tejasvee
tejasvee 2017-4-26
回答： temeraire007 2024-2-11
I want to train my Extreme Learning Machine. but data set should be normalized between -1 to 1.My data set is csv file.i want to know how to normalize csv file.I read the question asked by others but it didn't work.please help.
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Jan
Jan 2017-4-26
"It didn't work" is not a useful description of your problems. Please post your code and post a complete copy of the error message. How could we suggest an improvement, when we have to guess, what the problem is?

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Jan
Jan 2017-4-26
编辑：Jan 2017-4-26
You cannot normalize a file. You have to import the data at first, most likely by csvread or readtable. Then the normalization should be exactly as shown in many otehr threads:
Data = rand(10, 20); % Test data, use your data instead
minData = min(Data(:));
maxData = max(Data(:));
scaled = (Data - minData) / (maxData - minData); % Scaled to [0, 1]
scaled = scaled * 2 - 1; % Scaled to [-1, 1]
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Chris
Chris 2023-8-11
This doesn't work. It says Error using " / " Arguments must be numeric, char or logical. Even though the data i used is a numeric data.
Walter Roberson
Walter Roberson 2023-8-11
@Chris
It sounds as if you might have a table() object instead of a numeric array.
ExistingVars = YourTable.Properties.VariableNames;
NewTable = varfun(YourTable, @(V)rescale(V,-1,1), 'InputVariables', @isnumeric );
NewTable.Properties.Variablenames = ExistingVars;

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temeraire007
temeraire007 2024-2-11
There are also a couple of tools you can use. I have to do this kind of data cleaning on a monthly basis as our CRM is just completely useless. The tools are not perfect by any means, but for me for large files like +5K data entries saved some time.
OpenRefine (will have to download the tool but its really powerful to automate)
DataNormalizer (Online solution, so no need to download anything, got quiet good results quickly)
TableAnalyzer (tool from Microsoft but I think only works for MicrosoftAccess)

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