Will not pull values from array

[gparaiso]

Hi, for some odd reason Mathcad 15 is not pulling from the "enx array" despite that array having values in these indicies.  Is it because the derivative? Anyway I can fix this?

Thanks

[Werner_E]

You should post the worksheet, if possible.

[RichardJ]

It has nothing to do with the derivative.

It's hard to debug a picture, so please post a worksheet. Making a wild guess, what is the value of N, and how many rows does enx have?

[AndyWesterman]

What happens if the condition:

is not met?

If it is in any case from 0 to N-1 then the individual element will default to a 0 result:

If , however , it is the last element, then the array will be 1 entry short:

As the next calculation is looking for enx[N which does not exist, Mathcad reports an error.

Regards

Andy