how do I dynamically change variable name for dataset array?

I want to change the names of the dataset arrays. For instance, I want hour1, hour2, hour3, day1, day2, day3, fivemin1, fivemin2, and fivemin3. Unfortunately, I am getting variables with those names, but not in the way that I want. All the values are getting placed into variablea hour, day, and fivemin.

 hour = dataset 
    day = dataset
    fivemin = dataset
for i = 1:3
    eval(sprintf('hour%d = [1:i]', i))
    eval(sprintf('day%d = [1:i]', i))
    eval(sprintf('fivemin%d = [1:i]', i))
    fileName = ['GPL_OCT_' num2str(i) '_hour.xls']
    hour = [hour; dataset('xlsfile', fileName)]
    fileName = ['GPL_OCT_' num2str(i) '_hour.xls']
    day = [day; dataset('xlsfile', fileName)]
    fileName = ['GPL_OCT_' num2str(i) '_5min.xls']
    fivemin = [fivemin; dataset('xlsfile', fileName)]
end

Answer 1

[Daniel Shub]

See FAQ: 3F

Answer 2

[Stephen23]

http://www.mathworks.com/help/matlab/matlab_prog/string-evaluation.html

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