yeah i couldnt see a clear method. loop through the whole thing and set to 0. or maybe, i don't really know c, you can set the whole array to 0 with table=0;? either way, a quick flushing loop shouldnt last longer than one k-rate cycle.
there should be a couple length options. quick look at privatepublic (thx @cpwitz!!!) gave m this
edit. maybe this works?
memset(arr, 0, sizeof arr);