how can I change variable inside for loop?

I have 4 data sets data1,data2,data3 and data4. all of them have size of 100 x 2. I want to delete the second column of each data set. I want to use for loop so that it automatically takes data1, followed by data2 and so on.

Additionally, If I want to save names from 1 to 12 e.g if I have 12 data sets and instead of manually assigning names as data1, data2,data3...data 12, I want to use loop for assigning names. thanks

[Walter Roberson]

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