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How to get data from variables that change the name?

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Kelly Kyriakou
Kelly Kyriakou 2017-1-13
评论： Image Analyst 2017-1-14
I have the variables day1,day2,day3....day15. I want to get the data of each variable within a loop. How I can do it?
Thank you in advance
  2 个评论
Stephen23
Stephen23 2017-1-13
编辑：Stephen23 2017-1-13
@Kelly Kyriakou: read this carefully:
https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval
Learn to use indexing rather than make lots of separate variables. Then your life suddenly gets better :)
Kelly Kyriakou
Kelly Kyriakou 2017-1-13
Thank you very much. Indeed being a beginner at matlab the idea of indexing is not well-established in my mind.

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回答（2 个）

John Chilleri
John Chilleri 2017-1-13
Hello,
A simple solution would be:
Days = [day1 day2 day3 ... day15];
Then call Days(:,i) for the ith days data if it's a vector (assuming column vectors), or just Days(i) if it's a scalar.
Hope this helps!
Image Analyst
Image Analyst 2017-1-13
The "data of each variable" and the variable itself are one and the same thing. Just assign it to another variable if you want, or just start using it.
someOtherVariable = day1;
someOtherVariable2 = day2 * pi * log(42);
someOtherVariable3 = day5 * cos(day12) + day9;
result = SomeFunction(day7);
and so on. You don't need to do anything special to the variable to access it's "data". The variable and its data are the very same thing.

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