Re: Why don't my plots appear? My 5.2 code no longer works correctly

*To*: mathgroup at smc.vnet.net*Subject*: [mg89339] Re: Why don't my plots appear? My 5.2 code no longer works correctly*From*: Szabolcs <szhorvat at gmail.com>*Date*: Sat, 7 Jun 2008 02:50:07 -0400 (EDT)*References*: <g2b4nj$nlf$1@smc.vnet.net>

On Jun 6, 1:49 pm, "Charlie Brummitt" <cbrumm... at wisc.edu> wrote: > Hello, > I am running into difficulties with Plot. Some code of mine that worked in= > 5.2 no longer works correctly in 6.0.2.0. Specifically, no plots appear > whenever Plot (or Plot3D or DensityPlot or ListPlot) is called within a > function that I have defined. > > Here is a closely related question: What does the red semicolon ";" mean a= t > the end of "Plot[ ... ];"? Why is it red? In 5.2, placing a semicolon at t= he > end of Plot[] allowed me to output a plot in the middle of a computation, > without halting the computation. Now I can no longer seem to output a plot= > in the middle of a long computation. (I only see the output of Print[] > commands.) I must be able to see these plots during long computations, lik= e > I was able to in 5.2. > > What's wrong? Can anyone please help? > > Thanks, > > Charlie This has already been explained many many times. Search the MathGroup archives. In v6, graphics do not appear as a side effect of a command, but they are the actual value returned by the function. If you suppress the return value with a semicolon, nothing will be shown. In v6, graphics are like any other expression, they are just formatted differently.