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I have the following plot:

Plot[Table[C*r^2 + 2 C, {C, {25, 100, 150, 300}}] // Evaluate,
     {r, 0, 1000}, 
     PlotLegends ->LineLegend[{25, 100, 150, 300}, LegendLabel -> C,
             LabelStyle -> {GrayLevel[0.2], Bold, 10}, LegendFunction -> "Frame"], 
     AxesLabel -> {r, Plot}, 
     PlotLabel -> "Plot"]

But I need to include a constraint: r >= C. So when C is 300, the plot should show only for r = 300 to r = 1000.

How should I modify this code?

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3
  • $\begingroup$ Change the first argument in Table to ConditionalExpression[C*r^2 + 2 C, r >= C]? $\endgroup$
    – kglr
    Jul 24, 2014 at 21:24
  • $\begingroup$ it worked! Shame on me, it was too easy. thank you! $\endgroup$
    – YoJesseP
    Jul 24, 2014 at 21:31
  • $\begingroup$ my pleasure. Welcome to mma.se. I posted the comment as an answer. $\endgroup$
    – kglr
    Jul 24, 2014 at 23:38

1 Answer 1

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Plot[Table[ConditionalExpression[C*r^2 + 2 C, r >= C], 
          {C, {25, 100, 150, 300}}] // Evaluate, 
     {r, 0, 500}, 
     PlotLegends -> LineLegend[{25, 100, 150, 300}, LegendLabel -> C, 
                               LabelStyle -> {GrayLevel[0.2], Bold, 10}, 
                               LegendFunction -> "Frame"], 
     AxesLabel -> {r, Plot}, 
     PlotLabel -> "Plot"]

enter image description here

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