MATLAB: How to add variables in workspace with names derived from a char array and corresponding values stored in a double array

bad ideabuggycomplexdynamically named variablesMATLABslow

char array col_names = [time; speed; distance…] and double array data = [0;1;2;3… ,10;20;30;40.. ,5;6;7;8…]. col_names is a mXn matrix and data is a kXm matrix. I need to generate workspace variables time, speed, distance.. with their value content coming from data matrix

Best Answer

Here is an example

col_names = ['time ';'speed'];
data = [0 1;2 3;4 5];
for m = 1:2
    eval(sprintf('%s = data(:,m)',col_names(m,:)));
end

HTH

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Do NOT do this

This would actually be horribly slow, pointlessly complex, obfuscated, and very buggy way to write your code. You would make your code hard to debug, and a pain to work with. Read this to know why:

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

Using indexing would be simple, neat, and very efficient. You should use one array and indexing. Indexing is the solution you should be using, because it is the most efficient way to write MATLAB code, is simple, neat, and very easy to debug. Indexing is explained quite well in the MATLAB introductory tutorials, which are highly recommended for all beginners:

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

MATLAB: Create single variable from workspace variables

Hi Juri,

You can get the names of all variables in your workspace using 'who' and you can access the variables with the corresponding names with 'eval'.

I am providing the code for your problem assuming all the variables in your workspace are of same dimensions (column arrays).

clc;
clear;
one=randi(100,10,1);   %creating random number column arrays.
two=randi(100,10,1);   %You can remove these three lines along with the clc and clear on top.
three=randi(100,10,1);
k=who;                   %getting the names of all the variables in workspace.
len=length(k);          %calculating the number of rows(variables).
y=[];
for i=1:len
    if(i==1)
        y=eval(k{i});
    else
    y=[y eval(k{i})];       %creating a matrix from the variables.
    end
end
t=array2table(y,'VariableNames',k')     %creating the table from the matrix with the variables names on top of the coulumn.

't' here is the final table you wanted.

Hope this clears your query.

Thanks,

Aditya.

Best Answer

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