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# Smath solve/doesn't solve issue

## Smath solve/doesn't solve issue

(OP)
Hi,
I have an issue with Smath that I can't figure out.
For the most part, I have been able to learn Smath on my own, despite the absence of any user manual, and only a few brief tutorials written by users themselves. I am relying very heavily on my long experience with Mathcad to pick this up - but it's a double-edged sword because Smath doesn't do all that Mathcad did.

One thing I would like is a list of error messages and their meaning. I can't find any references to this error expression on the SmathStudio website/forum. I could probably solve this for myself if I could find one. I've made a request on the SMath forum.

The file linked below is part of a very long analysis that's suddenly gone bad on me - no idea why.
Only the parts before the strange error are included. The rest is very very long.
I've also included a screen-capture of the offending expression:

For those who need to ask:
1) The value is C=2.44E-8, Dk=15.6, f=0.39, R=0, DKth=2.9, Kmax=15.6, Kcrit=49.1, n=2.601, p=0.5, q=1
2) the units in the formula are a mess, but not because I want to write formulas that way; this has to conform to a provided format,

Any suggestions to get the expression to solve, AND assign the result to the da_dN variable?

No one believes the theory except the one who developed it. Everyone believes the experiment except the one who ran it.
STF

### RE: Smath solve/doesn't solve issue

(OP)
That is interesting.
I got a response from a similar question on the SMATH forum.
There is a setting on every expression under "Optimization" that controls if an expression is evaluated symbolically or numerically. I somehow had toggled this one to "Symbolic" so it was attempting to find an algebraic simplification. In my world, that's a useless feature, but to math people, it's probably irresistible.

When I tried your suggestion on the field still set to "symbolic", pressing the "=" at the end not only forced the evaluation, but toggled it to "numeric" at once.

Thanks!

No one believes the theory except the one who developed it. Everyone believes the experiment except the one who ran it.
STF

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