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Original Message (ID '82187') By Bill Simpson:
In the olden days Plot[] had a side effect of displaying the graphic. So things like x=4; Plot[y^2,{y,-2,2}]; z=3; would show the plot. Now days if Plot has a trailing semicolon you see nothing. So do this x=4; Print[Plot[y^2,{y,-2,2}]]; z=3; and you should see your plot