sum of all the variables in workspace how to find?

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Seetha Rama Raju Sanapala 2018-2-27

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编辑： Stephen23 2018-2-27

I have some 100 numbers in the workspace with big names. I want to find the sum of all these variables in the workspace - without writing the big equation for it. Is there a direct way to find the sum of all the numeric variables in the workspace?

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Adam 2018-2-27

编辑：Adam 2018-2-27

If you want to sum them why are they in individual variables in the first place instead of being in an array, which is the natural place for a bunch of numbers for which taking the sum is an appropriate action?

There may be some horrendous way using 'whos' and 'eval', but I never use eval so I wouldn't know the syntax even if it does exist.

Stephen23 2018-2-27

" Is there a direct way to find the sum of all the numeric variables in the workspace?"

No, there is no direct way to achieve this. And the indirect ways are very bad ways to write code: pointlessly complex, slow, buggy, hard to debug.

Learn to use arrays because that is what MATLAB is for. If you want to learn how to use MATLAB efficiently then use arrays.

https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

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Noam 2018-2-27

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https://ww2.mathworks.cn/matlabcentral/answers/385133-sum-of-all-the-variables-in-workspace-how-to-find#answer_307388

在 MATLAB Online 中打开

clear all;
x=10;
y=2;
z=3;
allvariables = whos; 
sumOfVars = 0; 
for i = 1:length(allvariables)
    sumOfVars = sumOfVars + eval(allvariables(i).name);
end

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Seetha Rama Raju Sanapala 2018-2-27

Thank you all for the comments and answers. I have learnt some new things. Also from comments - what to avoid, the bad practices. Both the solution and the comments are new learning for me.