turn on suggestions

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

Showing results for

- JMP User Community
- :
- Discussions
- :
- Solve y = f(y,x)

Topic Options

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

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Get Direct Link
- Email to a Friend
- Report Inappropriate Content

Apr 30, 2015 6:06 PM
(1491 views)

Hi,

I would like to use JMP to solve for y in an equation of the form y = f(y,x). A more precise equation is attached. This problem seem similar to that discussed in Numerical solver add-in, although a clear solution is not mentioned.

In the attached equation, y is response, x is predictor, and a - k are fitting parameters.

What is the best way for JMP to tackle this? I am using JMP11. Thanks!

1 ACCEPTED SOLUTION

Accepted Solutions

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Get Direct Link
- Email to a Friend
- Report Inappropriate Content

Apr 30, 2015 6:36 PM
(2484 views)

Solution

Hi,

I will make an assumptions: You have a series of data points with both x and y measured.

The way I have handled this in the past since you have an implicit equation, is to recast it as an explicit equation by creating a new function.

If you subtract the left hand elements from both sides you get an equation equal to zero.

0 = right hand(x,y) - left hand(x,y)

Now substitute a variable for zero so you have a new equation.

z = right hand(x,y) - left hand(x,y)

Now set Z at all points equal to 0 (zero) and solve as a multi-variable problem.

Caveat I have not done a rigorous error analysis on this technique, but just used in the past with success.

Good Luck.

Andy

2 REPLIES

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Get Direct Link
- Email to a Friend
- Report Inappropriate Content

Apr 30, 2015 6:36 PM
(2485 views)

Hi,

I will make an assumptions: You have a series of data points with both x and y measured.

The way I have handled this in the past since you have an implicit equation, is to recast it as an explicit equation by creating a new function.

If you subtract the left hand elements from both sides you get an equation equal to zero.

0 = right hand(x,y) - left hand(x,y)

Now substitute a variable for zero so you have a new equation.

z = right hand(x,y) - left hand(x,y)

Now set Z at all points equal to 0 (zero) and solve as a multi-variable problem.

Caveat I have not done a rigorous error analysis on this technique, but just used in the past with success.

Good Luck.

Andy

- Mark as New
- Bookmark
- Subscribe
- Subscribe to RSS Feed
- Get Direct Link
- Email to a Friend
- Report Inappropriate Content

May 1, 2015 11:42 AM
(1242 views)