How to calculate math expressions in matlab

How can we calculate

when know n=8, P = [ 1 2 3 4 0 7 6 5], ci is the number of elements of the set { j > i, pj < pi }

please help me!

[Jan]

Neither j, nor pj, nor pi occur in this formula. The right hand side does not depend on P. The value of c_i is not explained.

Please post, what you have tried so far and ask a specific question. Define all inputs of the formula, and nothing else, to reduce the level of confusion.

[hang dong]

i is the index of elements of P,

P_ j is the value of P at position j

c_i is the number of elements of P satisfying the condition

{ j > i, p_j < p_i }