how to execute a loop through all the variables in the workspace?

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Roberta 2014-10-5

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https://ww2.mathworks.cn/matlabcentral/answers/157428-how-to-execute-a-loop-through-all-the-variables-in-the-workspace

评论： Roberta 2014-10-5

采纳的回答： Guillaume

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Hi all,

Here's my question:

I ha about 300 variables in my workspace, which are named accordingly to the contents (are macroeconomic time series for 20 countries)

for example:

gdpUK (is the GDP of United Kingdom)
gdpUS (is the GDP of United States)
... (and so on for 20 countries)
reerUK (is the real effective exchange rate for the United Kingdom)
reerUS (REER for US)and so on

I would like to standardise these series, i need something that do:

for i= first variable: last variable
i=(i-mean(i))/std(i)
end

how can I do this?

thank you in advance for your help! :)

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Answer 1

Guillaume 2014-10-5

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https://ww2.mathworks.cn/matlabcentral/answers/157428-how-to-execute-a-loop-through-all-the-variables-in-the-workspace#answer_153964

编辑：Guillaume 2014-10-5

在 MATLAB Online 中打开

It would have been better to store your data in tables or even cell arrays or maps. Anyway:

for cv = who('gdp*')' %transpose to get a row cell array
  eval(sprintf('mean%1$s = (%1$s - mean(%1$s)) / std(%1$s);', cv{1})); %1$s is replaced by var name, output is named meanvarname
end
%same with 'reer*'

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Roberta 2014-10-5

Thank you very much!

It solved the problem even if, as you said, it isn't certainly the most efficient solution. Actually I was looking for a quick&dirty solution, and I've found it!

Once more, thank you!

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