how can i re-order rows in matrix by deleting un-desired rows by applying the condition to specific column ?

Hey i have matrix of 3 columns and un-marked m numbers of rows i need to re-arrange these rows according to value of third column and this is the condition i need to apply 1- first values of third column is the biggest value and i need all values comes after that to be equal or less than the first value of the rows if the next value of third column is bigger than which before it then delete row how can i do it thanks Tarek

[dpb]

Whew!!! That was a mouthful. Show us a (small) example input and desired output and maybe we can correlate the two...

[Jan]

What is "the next value of third column" and "bigger than which before"? Which row should be deleted?

Answer 1

[Jan]

Perhaps:

Data     = rand(1000, 3);
toDelete = Data(:, 3) > Data(1, 3);
Data(toDelete, :) = [];