@Kitonum 

I find that can work with a matrix :

It is convenionce for inputting datas.

So, is it meaning that add() is more useful and versatile than sum() ? 

@Kitonum 

I see. 

Previously I defined it http://www.tuzhan.com/sainimu78/63d477279daca07e.html 

It is bizzare .

I want the DCT F(u,v) function working . How should I express in Maple?

@Kitonum 

I define another function that is DCT expression 

then 

Another problem appeared , how can I do ?