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
- :
- Solve, X.

Options

- Subscribe to RSS Feed
- Mark Topic as New
- Mark Topic as Read
- Float this Topic for Current User
- Bookmark
- Subscribe
- 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
- Subscribe to RSS Feed
- Permalink
- Email to a Friend
- Notify Moderator

06-08-2013
01:51 PM

06-08-2013
01:51 PM

Labels:

1 ACCEPTED SOLUTION

Accepted Solutions

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

06-10-2013
09:53 AM

06-10-2013
09:53 AM

??Absolutely not sure what the question is. What should X be? Ther term for x from the first example??

As Alan pointed out, the second system will not have a unique solution. If it has no solution at all or an infinite number of solutions depends on the rank of the extended matrix. If its 3, we will have no solution, if its 2 there is an infinite number of solutions. The latter case is for X=(sqrt(2)-1)*(a+b).

Mathcads result is inaccurate and misleading, but MC can do better using "fully":

4 REPLIES 4

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

06-10-2013
06:30 AM

06-10-2013
06:30 AM

Re: Solve, X.

The determinant of the matrix multiplying the vector of (x, y, z) is zero.

*An nxn nonhomogeneous system of linear equations has a unique non-trivial solution if and only if its determinant is non-zero. If the determinant is zero, then the system has either no nontrivial solutions or an infinite number of solutions.*

Alan

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

06-10-2013
07:47 AM

06-10-2013
07:47 AM

Re: Solve, X.

Thanks for your response. I agree with you, Alan. And I'm also observing those ( for example ) :

Best Regards.

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

06-10-2013
09:53 AM

06-10-2013
09:53 AM

??Absolutely not sure what the question is. What should X be? Ther term for x from the first example??

As Alan pointed out, the second system will not have a unique solution. If it has no solution at all or an infinite number of solutions depends on the rank of the extended matrix. If its 3, we will have no solution, if its 2 there is an infinite number of solutions. The latter case is for X=(sqrt(2)-1)*(a+b).

Mathcads result is inaccurate and misleading, but MC can do better using "fully":

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

06-10-2013
10:12 AM

06-10-2013
10:12 AM

Re: Solve, X.

Something like this?

Top Tags