interpolation outside the range

i have to interpolate values for 0.5,1,1.5 & 2.5 but my maximum available value is 0.015 what to do?

[KSSV]

You cannot......extrapolation cannot be trusted.....

But still to make question clear.....you have values till 0.015 and you want values for 0.5,1,etc??

Answer 1

[Jan]

"Interpolation" works inside the given range of data only. If you want a point outside, this is an "extrapolation", which is instable, if you do not have additional knowledge like the wave form or the underlying formula.