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A very simple question. I have a data table with three columns. how can i plot column 1 vs column 3 using ListPlot?

thx in advance

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my list looks like this t={{14., 14.1, 14.2, 14.3, 14.4, 14.5, 14.6, 14.7, 14.8, 14.9, 15.}, {14., 14.1, 14.2, 14.3, 14.4, 14.5, 14.6, 14.7, 14.8, 14.9, 15.}, {16., 16.1, 16.2, 16.3, 16.4, 16.5, 16.6, 16.7, 16.8, 16.9, 17.}}. ListPlot[{t[[1]],[[3]]}] doesnt gives me column1Vscolumn3 ! :/ – Darwin Jan 22 at 13:35
Take a look at Transpose. – Andy Ross Jan 22 at 13:45
You need {t[[1]], t[[3]]} to take the first and third element. From this (see @AndyRoss), you'll need to make the pairs (x,y) to be plotted. – b.gatessucks Jan 22 at 13:46
Help can be found here – cormullion Jan 22 at 13:50
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closed as too localized by Ajasja, Yves Klett, Szabolcs, Sjoerd C. de Vries, Artes Jan 22 at 17:33

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2 Answers

up vote 0 down vote accepted

The usual way to convert two sets of coordinates into one set of coordinate pairs in Mathematica is to use Transpose:

x = Range[10]
y = Range[1,20,2]

pairs = Transpose[{x,y}]

This might not feel intuitive if you are new to Mathematica.

For your data you could use either

ListPlot[Transpose[t][[All, {1,3}]]]

or

ListPlot[Transpose[ t[[{1,3}]] ]]
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thanks belisarius and Szabolcs your suggestions worked for me – Darwin Jan 23 at 9:24
up vote 2 down vote

The meaning of "vs" in your question has two possible interpretations:

t = {{14., 14.1, 14.2, 14.3, 14.4, 14.5, 14.6, 14.7, 14.8, 14.9, 15.}, 
    {14., 14.1, 14.2, 14.3, 14.4, 14.5, 14.6, 14.7, 14.8, 14.9,  15.}, 
    {16., 16.1, 16.2, 16.3, 16.4, 16.5, 16.6, 16.7, 16.8, 16.9,  17.}};

ListLinePlot[Transpose[t][[{1, 3}]], AxesOrigin -> {0, 13}]

Mathematica graphics

Or:

ListLinePlot@Transpose[Transpose[t][[{1, 3}]]]

Mathematica graphics

share|improve this answer
i mean column1 being the x-axis and column3 being the y axis – Darwin Jan 22 at 15:38
@Darwin That is the second plot in my answer – belisarius Jan 22 at 16:29

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