Interpolation on tables using matlab

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ORESTIS KOKKINOS
ORESTIS KOKKINOS 2020-12-13
评论： ORESTIS KOKKINOS 2020-12-13
Hello, I am solving several probems in Thermodynamics and one of my most time consuming things solving problems is the interpolation.
That not exactly the same as an interpolation on a plot, so thats why Im writing a new post.
I had my exam and succeed in MatLab last week but was a short tour of 15 hours so Im still new at this! :)
So the thing is I have a table giving several temperatures and for the given temperatures I have columns next to them giving the related energy, enthalpy and entropy.
So if I have temperature that is not given on the table I have to do an interpolation for the temperature I need, so I was thinking about a function that could read the 3 temperatures as x1 x2 x3 then read the 2 energys lets say as y1 y3 and I will need to calculate the y2 which is what Im looking for.
The equation Im using on my calculator looks like y2={[(x2-x1)/(x3-x1)]*(y3-y1)}+y1
I know is simple but Im just too short on time and cant get it to work :(

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回答（1 个）

Cris LaPierre
Cris LaPierre 2020-12-13
If you are using MATLAB, just use the interp1 function. Just be sure to follow the expected syntax, described in the linked documentation page.
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Cris LaPierre
Cris LaPierre 2020-12-13
Like I said, you can write a similar function in MATLAB if you are particular about the calling syntax. You could write that same function in 3 lines in MATLAB. If that's what you prefer, see this documentation page on how to create a function.

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