Turn on suggestions

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

Showing results for

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

Showing results for

** Community Tip** - When posting, your subject should be specific and summarize your question. Here are some additional tips on asking a great question.
X

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

Mar 11, 2020
07:04 AM

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

Mar 11, 2020
07:04 AM

two eq. with two unknows.

1 ACCEPTED SOLUTION

Accepted Solutions

Mar 12, 2020
10:46 AM

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

Mar 12, 2020
10:46 AM

Create a 2 element vector and put in the equations. It's simple.

Success!

Luc

6 REPLIES 6

Mar 11, 2020
08:07 AM

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

Mar 11, 2020
08:07 AM

Well, first you must assume that c3 is constant. . .

Mar 11, 2020
08:46 AM

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

Mar 11, 2020
08:46 AM

I think that Prime cannot solve a solve block symbolically.

But if you write it simply like this:

You get your answer, for c1 and c2 in terms of the other items in the equations.

Note that u3 is common to both equations, so your problem can also be described with:

This gives you a free choice for c1, then with u1, u2, c3 and l known, you can calculate c2.

Success

Luc

Mar 11, 2020
09:08 AM

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

Mar 11, 2020
09:08 AM

@LucMeekes wrote:

I think that Prime cannot solve a solve block symbolically.

That's correct. It would be possible to do so in real Mathcad (=Mathcad 15 and below) but they destroyed this possibility when they developed Prime. So the only way is to use the symbolic "solve" command as you had shown.

Mar 12, 2020
07:10 AM

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

Mar 12, 2020
07:10 AM

I don't understand, how do you put it like that, in a matrix or what?

Can you maybe send the mathcad file..

Mar 12, 2020
10:46 AM

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

Mar 12, 2020
10:46 AM

Create a 2 element vector and put in the equations. It's simple.

Success!

Luc

Mar 12, 2020
11:06 AM

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

Mar 12, 2020
11:06 AM

There's more wrong with your sheet.

You define two equations with c1, c2, u1, u2 etc. these symbols are all labelled as constants.

Then you write the Find function where you want to solve c1 and c2, but these are labeled as <nothing>.

NOTE that a constant c1 is very different from a variable c1, or a unit c1 (if that would be defined).

Written like this, Prime can never solve it.

Success!

Luc