Get Help

Turn on suggestions

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for

- Community
- :
- PTC Mathcad
- :
- PTC Mathcad
- :
- Help with solve block - errors

Options

- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- Mute
- Printer Friendly Page

Auto-suggest helps you quickly narrow down your search results by suggesting possible matches as you type.

Showing results for

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Notify Moderator

01-19-2016
03:51 PM

01-19-2016
03:51 PM

Help with solve block - errors

I already defined the solve block variables but mathcad is still giving me an error that shows that the variable/equations are undefined.

Can anyone help me find the error here so I can find variable P?

Thanks!

2 REPLIES 2

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Notify Moderator

01-19-2016
05:48 PM

01-19-2016
05:48 PM

Re: Help with solve block - errors

You first need to fix a units problem. Mathcad insists P has units of force, in which case sigma(P) has units of pressure. It therefore cannot be equated to sigma[n, which has units of force.

- Mark as New
- Bookmark
- Subscribe
- Mute
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Notify Moderator

01-20-2016
09:27 AM

01-20-2016
09:27 AM

Re: Help with solve block - errors

As Richard said, it's a units problem.

Your solution would be:

But when evaluated:

Success!

Luc