What does this LUA line mean? ""%i (%.3f GHz)" %{ f.channel, f.mhz / 1000 })" -

i have question concerning snippet of code

ch = s:taboption("general", value, "channel", translate("channel")) ch:value("auto", translate("auto")) _, f in ipairs(iw , iw.freqlist or { })     if not f.restricted        ch:value(f.channel, "%i (%.3f ghz)" %{ f.channel, f.mhz / 1000 }) //this line?     end end 

what doing line?

ch:value(f.channel, "%i (%.3f ghz)" %{ f.channel, f.mhz / 1000 }) 

i think assigning value ch cannot understand one, because cannot understand section "%i (%.3f ghz)" %{ f.channel, f.mhz / 1000 }

thanks in advance!

complete code

-- check whether there client interface on same radio, -- if yes, lock channel choice station dicatate freq local has_sta = nil local _, net _, net in ipairs(wdev:get_wifinets())     if net:mode() == "sta" , net:id() ~= wnet:id()         has_sta = net         break     end end  if has_sta     ch = s:taboption("general", dummyvalue, "choice", translate("channel"))     ch.value = translatef("locked channel %d used %s",         has_sta:channel(), has_sta:shortname()) else     ch = s:taboption("general", value, "channel", translate("channel"))     ch:value("auto", translate("auto"))     -- _, f in ipairs(iw , iw.freqlist or { })     _.iw.chanlist, f in ipairs(iw , iw.freqlist or iw.channels)         if not f.restricted             ch:value(f.channel, "%i (%.3f ghz)" %{ f.channel, f.mhz / 1000 })         end     end end 

"%i (%.3f ghz)" %{ f.channel, f.mhz / 1000 } 

1. the %i parse argument integer.
2. %.3f formats second argument floating point number 3 decimal places.
3. %{} defines arguments being passed previous string formatting.
   • first parameter f.channel
   • second argument f.mhz/1000.

---

ch:value( f.value, ... ) 

is same following:

ch.value( ch, f.value, ... )