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I am plotting this contour map Mathematica (Version 13.0.1):

ContourPlot[Log[x] + Log[y], {x, 0, 8}, {y, 0, 6}, AxesLabel -> Automatic, ContourShading -> False, Contours -> {1, 2, 2 Log[3], 3}, ContourStyle -> {{Thick, Blue}}, ContourLabels -> (Text[Style[#3, 14, Blue], {#1, #2}] &), Frame -> False, Axes -> True, GridLines -> None, Ticks -> {{3}, {3}},TicksStyle -> Directive[14]]

The result is pasted below. Clearly, Mathematica mixes up the labels of the last two contour lines. The problem vanishes if I use the numerical value of 2*Log[3], so I am guessing the Log function creates problems here. What could it be? How could I work around it?

Thanks!

enter image description here

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    $\begingroup$ Welcome to Mathematica StackExchange! Can you please edit the question and include which version of Mathematica you are using? I cannot reproduce your issue in version 14.3 ... So it might be that there was a bug that was already fixed in some previous version. $\endgroup$ Commented Oct 3 at 9:48
  • $\begingroup$ I can reproduce the bug on version 13.0.1. $\endgroup$ Commented Oct 3 at 10:33
  • $\begingroup$ Thanks for the feedback! I have added the version number 13.0.1. If it works in a newer one, I'll find a workaround... $\endgroup$ Commented Oct 3 at 12:08
  • $\begingroup$ Also version 14.2 is Ok $\endgroup$ Commented Oct 3 at 17:49

1 Answer 1

Reset to default
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Workaround:

contours = {1, 2, 2 Log[3], 3};
rule = Thread[N@contours -> contours];

ContourPlot[Log[x] + Log[y], {x, 0, 8}, {y, 0, 6}, 
 AxesLabel -> Automatic, ContourShading -> False, 
 Contours -> N@contours, ContourStyle -> {{Thick, Blue}}, 
 ContourLabels -> (Text[Style[#3 /. rule, 14, Blue], {#1, #2}] &), 
 Frame -> False, Axes -> True, GridLines -> None, Ticks -> {{3}, {3}},
  TicksStyle -> Directive[14]]

enter image description here

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