Help with MATLAB code

Use the find function to determine the genes that show either a

reduction in expression by 20% or an increase in expression by 20%. In

other words, the ratio should be less than or equal to 0.8, or greater

than or equal to 1.2.

[Walter Roberson]

http://www.mathworks.com/matlabcentral/answers/6200-tutorial-how-to-ask-a-question-on-answers-and-get-a-fast-answer