Interpolation::indat ListInterpolation::indat

Details

This message is generated when the first element or one of the first elements in the indicated data point is not a real number.
Off[message] switches off the message; On[message] switches it on. For example: Off[Interpolation::indat].

An error occurs because the first element in each pair is not a number:

Wolfram Language code: Interpolation[{{x1, 1}, {x2, 2}, {x3, 3}, {x4, 4}}]

This shows valid input in Interpolation:

Wolfram Language code: Interpolation[{{1, y1}, {2, y2}, {3, y3}, {4, y4}}]

InterpolatingPolynomial can be used for symbolic interpolation:

Wolfram Language code: InterpolatingPolynomial[{{x1, 1}, {x2, 2}, {x3, 3}, {x4, 4}}, x]

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