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

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harshpurohit11
harshpurohit11 2018-8-17
编辑： Stephen23 2018-8-18
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
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harshpurohit11
harshpurohit11 2018-8-17
编辑：harshpurohit11 2018-8-17
Stephen, thanks for the link, however I was not able to make eval work for me for my given problem at hand. I tried doing the following and i got an error saying "scripted assignment dimension mismatch"
for i = 1:length(col_names)
eval('col_names(i,1:end) = data(:,i)');
end
James Tursa
James Tursa 2018-8-17
编辑：James Tursa 2018-8-17
The syntax should have been:
for i = 1:size(col_names,1)
eval([col_names(i,1:end) ' = data(:,i)']);
BUT ... you are missing the entire point of Stephen's post. This is a very poor programming practice. Read Stephen's link to see why and to discover better methods of writing your code that are easier to read, maintain, etc.

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Honglei Chen
Honglei Chen 2018-8-17
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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Honglei Chen
Honglei Chen 2018-8-17
I have no issue running this code. Can you clear your workspace and try again? This is just an example showing how this can be done.

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Steven Lord
Steven Lord 2018-8-17
Instead of dynamically creating variables, I recommend creating a table array. The variables (columns) in a table are named so you can reference the data using those names.
>> R = randi([-10 10], 15, 3);
>> T = array2table(R, 'VariableNames', {'time', 'speed', 'distance'});
>> T.distance ./ T.time

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