Talk:H-infinity methods in control theory

It's somewhat misleading to refer to this as a tool for finding optimal controllers. Technically, it is correct, since we are trying to minimize the error outputs z and hence we introduce some notion of optimality. However, especially in relation to robust control, $H_{\infty }$ controllers tend to be quite conservative and suboptimal in practical senses (tending to be sluggish and/or high-order controllers) - since the underlying problem is to find a stabilizing controller for a whole set of plants. I thought I should open this as discussion rather than edit the page since it's more of a semantics argument than a cut-and-dry technical change. M0nstr42, 05:46, 16 Jun 2005 (UTC)