Problem 55970. Interpolated Value Between Two Points

Created by Ben Placek

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Given two points,  and , a new location x, and a method "linear" or "cubic", return the value of a linear or cubic interpolant through the two points at the new location x, using the formulas below.
Linear: 
Cubic: 
where   and .
(This formulation for the cubic interpolant has zero derivative at each interpolation point.)
If , your function should produce an error with the message "x2 must be greater than x1".
If , your function should produce a warning with the message "x is outside the interval [x1,x2]" (but still return the value of the interpolant).
If the method is given as anything other than "linear" or "cubic", your function should produce an error with the message "method must be either "linear" or "cubic"".

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Last Solution submitted on Sep 19, 2025

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goc3 on 21 Oct 2022

This problem is not necessarily easy because it tests two disparate things. One of those things, warnings and errors, is rarely presented or tested on Cody. It would be helpful to have more problems that test warning and error usage.

Marco Riani on 15 Mar 2023

This is just to say that I fully agree with what goc3 wrote!
Rarely I have seen warnings and errors tested on Cody.

For example it would be nice to test errors where (as it is good practice and can be set in the MATLAB code Analyzer preferences),
"The first argument of error should be a message identifier".

Nikolaos Nikolaou on 22 Mar 2023

Is there a problem with testcase 2 ?

Dyuman Joshi on 24 Mar 2023

Nikolaos, the reference solution is working fine, there seems to be no problem with the test suite.

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Problem 55970. Interpolated Value Between Two Points

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Problem 55970. Interpolated Value Between Two Points

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Last 200 Solutions

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Problem Recent Solvers126

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