Error when calling interp1.

When I call interp1, an error occurs stated ,'there should be atleast two data points'. This error occur only if the values used in the program are large enough.

[Jan]

I suggest to post the code. Otherwise we can only guess the cause of the problems.

Answer 1

[Walter Roberson]

Are you providing inputs that have 15 or more digits before the decimal place? If so then you are probably exceeding the precision that is supported with IEEE 754 double precision. By the time you get to 4.5035996273705e+15 then representable double precision numbers are spaced apart by at least 1.

The same difficulty can happen with smaller numbers that are spaced more closely together. 3E15 + 1/2 cannot be told apart from 3E15 + 1/4