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I imported a list of data using

k = SemanticImport["Desktop/k_CARBON_eV.txt"]

enter image description here

And then I wanted to interpolate the data using: 

kinter = Interpolation[k];

But I got a message: enter image description here

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  • $\begingroup$ Try with ListInterpolation $\endgroup$ – zhk Jun 26 '17 at 0:55
  • $\begingroup$ Try converting the Dataset to an array, maybe Values /@ Normal@k. But you should really post code people can use to check solutions. $\endgroup$ – Michael E2 Jun 26 '17 at 1:05
  • $\begingroup$ Related/duplicate: mathematica.stackexchange.com/questions/149060/… $\endgroup$ – Michael E2 Jun 26 '17 at 1:07
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    $\begingroup$ Why are you still working with SemanticImport if you can't handle it? It was suggested to you to try to import "Table" or "Data" couple of times, have you tried? $\endgroup$ – Kuba♦ Jun 26 '17 at 6:19
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k is a dataset, which has head Dataset. Interpolation wants a list, typically a list of data pairs. To covert k to such, use Normal.

k = Dataset[{{5.88, .39}, {5.83, .41}, {5.73, .48}, {5.75, .58}}];
kinter = Interpolation[k // Normal];
Plot[kinter[x], Join[{x}, kinter["Domain"][[1]]]]

plot

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