×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Smath solve/doesn't solve issue

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

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources

eBook - Mastering Tolerances for Machined Parts
When making CNC machined parts, mastering tolerances can be challenging. Are general tolerances good enough? When does it make sense to call out for tighter tolerances? Do you need a better understanding of fits, datums, or GD&T? Learn about these topics and more in Xometry's new e-book. Download Now
eBook – How to Choose the Correct Corrosion Testing Method
When designing a metal component, engineers have to consider how susceptible certain alloys are to corrosion in the final product’s operating environment. In a recent study by NACE (National Association of Corrosion Engineers), it was estimated that the direct and indirect costs of corrosion in the United States is approximately 6.2% of the GDP. In 2016, that cost exceeded $1 trillion dollars for the first time. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close