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Student Support Forum: 'Logarithmic ListContourPlot' topicStudent Support Forum > General > "Logarithmic ListContourPlot"

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Christoph Popa
05/20/10 12:43pm

I have the following problem: I have a dataset in matrix form and want to create a double logarithmic ListContourPlot of it. Since Mathematica does not seam to have a built-in function for that, I tried to do it manually - without success:

As an example, I have the matrix

data = Table[i+j,{i,1,10},{j,1,10}];

My first attempt was to generate an interpolating function and thereafter create a ContourPlot of it, i.e.

{min,max} = {10^(-20),0.005};
interpol = ListInterpolation[data,{{min,max},{min,max}}];
plot1 = ContourPlot[interpol[10^x,10^y],{x,-5,-2},{y,-5,-2}]

This actually works for this example - but for some reason Mathematica fails to generate a proper interpolating function for my actual dataset. Therefore I tried it differently:

newdata = Flatten[Table[{Log[10,min+(i-1)max/9],Log[10,min+(j-1)max/9],data[[i,j]]},{i,1,10},{j,1,10}],1];
plot2 = ListContourPlot[newdata,PlotRange->{{-5,-2},{-5,-2}}]

There were no error messages, but plot1 and plot2 should be identical, which they are not. It seems that Mathematica arbitrarily changes the matrix elements (data[[i,j]]).

I'm very thankful for any help!

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Subject (listing for 'Logarithmic ListContourPlot')
Author Date Posted
Logarithmic ListContourPlot Christoph Popa 05/20/10 12:43pm
Re: Logarithmic ListContourPlot Peter Pein 05/23/10 06:26am
Re: Logarithmic ListContourPlot Isaac Abraham 05/23/10 10:41pm
Re: Logarithmic ListContourPlot Isaac Abraham 05/23/10 10:56pm
Re: Logarithmic ListContourPlot Chris 05/24/10 10:15am
Re: Logarithmic ListContourPlot Chris 05/24/10 2:54pm
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