Int interpolation

[vedran]

Hi,

i have some X and Y values in my database (ascii-file) and what i need is to calcute interpolation value for some unknown X.


for example:

My database looks so:
X = 2, 4, 6, 8
Y = 6, 7, 10, 13

and now i need the code for calculating some X value like X = 3 for what i dont have Y-Value in my database.

Thanx a lot
Vedran

[PauloM]

Hi,

Check attached example,

Hope it helps,
Paulo

[chilly_charly]

Beware of polynomial interpolation. It can generates unexpected results. For instance, here, for X values lower than 2.7, it returns Y values lower than 6. I don't think that this is what is expected. Most often a linear interpolation is sufficient. See the attached vi.

[vedran]

thanx both of you... that is what i needed 😉