You can't do a redirect from the view -- by the time the view is run, there is already content outputted to the browser (and redirects only work as headers, which must be sent before any content).

You could use a javsacript redirect, which works the same as it does anywhere else (so nothing specific to concrete5). Or you could put the redirect into a page controller (this is a bit more complicated, and really depends on exactly what you're trying to do -- i.e. under what circumstances are you wanting to redirect people and to where do you want to redirect them?)