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MathGroup Archive 1998

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Re: ListPlot and List problem



Lars Freund wrote:
> 
> Hi,
> 
> I want to plot data that is stored in a file having in the format:
> 
> <frequence> <phase> <amplification>
> 
> and want to plot the BODE-Diagram. So I did:
> 
> myData = ReadList["filename",{Number, Number, Number}];
> 
> and now want a plot from <phase> over <frequence> and <amplification>
> over <frequence>I tried things like
> 
> ListPlot[Transpose[testData][[3]],PlotJoined->True]
> 
> but I always got the wrong list-format. I need
> 
> {freqence1,phase1},{freqence2, phase2}...
> 
> and I always get things like
> 
> {phase1, phase2, phase3} or so.
> 
> Can anybody help me a bit?
> 
> Thanks,
> 
> Lars


Assuming myData is a 3xn matrix and you want a 2xn matrix using the
first two columns, Then

Transpose[{Transpose[myData][[1]],Transpose[myData][[2]]}]

should do the trick.
-- 
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