How to define a calculated item from other items?

[emx]

I have read somewhere that it is possible to use "calculated" items in Zabbix, however I have not found how to do it.

For example, let's take two existing fields for a Linux host, net.if.in[eth0] and net.if.out[eth0]. Imagine that for some bizarre reason I am interested in the ratio in/out.

I would need to define an item that would be = net.if.in[eth0] / net.if.out[eth0]

Does someone know how to do this? I have tried various syntax but to no avail.

[emx]

Not possible...

I just found out it isn't possible:

There are no calculated items in ZABBIX. The functionality hasn't been implemented and I do know if it ever be.