I'm using the Feb 2000 release of Hugs and am preparing student labs using the graphics library. Several nasties happen: * For very moderate problems (plot ~2K lines centred in a window of fixed size) I get a control stack overflow. To centre, the code finds pre-computes the minimum and maximum x and y ordinates of all line end-points. This is potentially a problem, but fixable in this case, you'd hope. However, the overflow happens EVEN IF the code is written tail-recursive, or using foldl. Oh dear. * If the relevant scaling factors are passed as parameters (to avoid pre-computation) I can plot quite a bit more (4997 lines on my W2000 set-up; rather more on an earlier installation under W98). But then the program aborts, presumably because of the C stack overflow problem. * On W2000 the previous problem corrupts the WHOLE screen buffer, rather like a virus. Actually this is fixable by maximising and then minimising the hugs window, but it's all very disturbing! On W98, the programs seems to die gracefully. So question: how do I increase the stack size? Also, are you aware of problems with the graphics library burning up the C stack? I cannot find anything in the hugs documentation, but have a feeling you have to recompile Hugs. Is this true? (Otherwise Hugs is completely wonderful...!) Many thanks. Tony Field Imperial College