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Plotting functions with undefined values

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  • Subject: [mg43744] Plotting functions with undefined values
  • From: "Ronaldo Prati" <rcprati at>
  • Date: Thu, 2 Oct 2003 02:52:29 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

Hello everybody

I'm a new student using mathematica and I couldn't solve my problem by 

I need to plot the function pos[m_] = (m + x -1)/(x+y-1), where 
0<=pos<1, x and y are between 0 and 1 but x+y-1!=0. My problem is 
that I could not input this constrain. When plot the function using 
Plot3D, at the region where x+y = 1 several erros of infinith 
expression 1/0 encountred are given. I'm not interested in plotting the 
region where x+1 occurs, but the region where the function has a true 
value (the graphic appers, but with a straigh region where it is undef). 
How can i solve it?

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