Student Support Forum: 'Plotting Plank's Radiance Formula' topicStudent Support Forum > General > "Plotting Plank's Radiance Formula"

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 Author Comment/Response Forum Moderator email me 09/28/99 07:55am >When I try and plot the following function, I get error messages as follows:> >Plot[(2*Pi*2.998e8*2.998e8*6.626e-34)/( x^5*(Exp[(6.626e-34*2.998e8)/(x*1.381e-23*293.15)]-1)), {x,1,10}] > >The errors (about three or four of them) say that some number is not a machine-sized real number. Does anyone know the way to solve this dilemma? ===== Did you check to see if you function actually evaluates to a number? For example, evaluating: (2*Pi*2.998e8*2.998e8*6.626e-34)/( x^5*(Exp[(6.626e-34*2.998e8)/(x*1.381e-23*293.15)]-1)) /. x-> 1 will show that Mathematica does not interpret your ''e'' notation as you expect. Replacing e with 10^ gives a function that can be plotted. Plot[(2*Pi*2.998 10^8*2.998 10^8*6.626 10^-34)/( x^5*(Exp[(6.626 10^-34*2.998 10^8)/(x*1.381 10^-23*293.15)]-1)), {x,1,10}] Tom Zeller Forum Moderator URL: ,

 Subject (listing for 'Plotting Plank's Radiance Formula') Author Date Posted Plotting Plank's Radiance Formula Matt Tilley 09/28/99 07:26am Re: Plotting Plank's Radiance Formula Forum Modera... 09/28/99 07:55am
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