H=syslin('c',352*poly(-5,'s')/poly([0,0,2000,200,25,1],'s','c'));
clf();evans(H,100);sgrid()
If I take out the sgrid() above and run the code I get a very good root locus plot! But if I run the above code with sgrid() included a momentary flicker of the root locus plot is shown and is then overwritten by the sgrid plot and the original root locus plot disappears! The example shows a different result! Both plots at the same time. How so I fix this?