How to use a MeshFunctions in ListDensityPlot[ ] ?

Questions
,
1

Hello Guys.

I plotted the data composed of many (x,y,z) points with ListDensityPlot and the graph looks nice with a good resolution. Here the value z ranges from 10 to 20 (for example).
I wanted to draw Meshes for z = 10, 12, 14, 16, 18, 20.
But when I used Mesh = 6, it is ok that the number of lines are 6, but the interval between succesive lines are not 2, nor equal interval.
It can be very easy for you. But I couldn’t find a solution for hours.
Would you help me…?
Thank you in advance.

And the code and data files are attached.

Best regards,
Jiwan

Post1.nb (503 KB)
Test.txt (775 KB)

2

Hi Jiwan,

It would help if you could edit your question and add the code you are using and attach a sample of the data.

Take a look at the documentation for MeshFunctions under the Options section for ListDensityPlot.

3

Thanks for providing the code and data. Is this is what you are looking for? Not sure why there are more than 6 contour lines though

data = HeffTempStr[[All, {1, 2, 4}]];
ListDensityPlot[data,
 PlotLegends -> Automatic,
 AxesStyle -> Directive[Black, Thick],
 LabelStyle -> Directive[Black, Large, FontFamily -> "Helvetica"],
 ColorFunction -> "BlueGreenYellow",
 FrameTicks -> {{{10, 20, 30, 40, 50, 60}, None}, {{400, 500, 600}, None}},
 Mesh -> {10, 12, 14, 16, 18, 20},
 MeshFunctions -> {#3 &}]

6953plot.png
6953plot.png432×360 23.4 KB

Maybe ListContourPlot is a better option? If you hover over a contour line the corresponding z value is shown as a tooltip.

ListContourPlot[data,
 PlotLegends -> Automatic,
 AxesStyle -> Directive[Black, Thick],
 LabelStyle -> Directive[Black, Large, FontFamily -> "Helvetica"],
 ColorFunction -> "BlueGreenYellow",
 FrameTicks -> {{{10, 20, 30, 40, 50, 60}, None}, {{400, 500, 600}, None}},
 Contours -> {10, 12, 14, 16, 18, 20, 25}]

3589plot.png
3589plot.png432×360 12 KB

4

ListDensityPlot with 6 contour lines:

data = HeffTempStr[[All, {1, 2, 4}]];

ListDensityPlot[
 	data, 
    PlotLegends -> Automatic, AxesStyle -> Directive[Black, Thick],
 	LabelStyle -> Directive[Black, Large, FontFamily -> "Helvetica"],
 	ColorFunction -> "BlueGreenYellow",
 	FrameTicks -> {{{10, 20, 30, 40, 50, 60}, None}, {{400, 500, 600}, None}},
 	Mesh -> 6, MeshFunctions -> {#3 &}
 ]

ContourLines.png
ContourLines.png439×365 21.7 KB

5

When I use Mesh → {{10,12,14,16,18}}, it works.
It’s simple grammar. -_-a
Thank you very much!
Best regards,
Jiwan.

6

Thank you all and I am sorry for the late reply.
I had the same problem, Rohit Namjoshi. When I used Mesh → {10,12,14,16,18}, there generated many lines. That’s why I asked the help.

Thank you Hans Milton for the suggestion.
I already tried ListContourPlot first. But the colour resolution was not good. That’s why I tried to use ListDensityPlot. -_-a

I am still trying to find the answer…