Dear Aleksei

Many thanks for your valuable reply.

I use MATLAB R2011a. However, when I open the fractional integral or fractional derivative blocks, I see a “LTI System” and a “Transfer Fcn1” block. When I open the “LTI System” block, which is a masked block, the only parameters that can be seen are “LTI System Variable” named as “G1” and “Initial States”, which is named as “[]”, but for the derivative or integral I only require changing their order. It would be my pleasure if you kindly please guide me on this problem. How can I change the order in the block or through the program?

Is this problem related to the MATLAB version, which I use? Would you please guide me about the solution?

Yours sincerely,

Khoshnevisan