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01-09-2020
08:57 AM

01-09-2020
08:57 AM

Team,

I'm trying to use the Mathcad minerr function with a recursive equation. Ideally, the terms, r, tau, alpha, and K would be found, using initial "guess" values, Kindly see the attached sheet.

Thanks,

Glen Atlas, MD, MSc

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01-10-2020
12:00 PM

01-10-2020
12:00 PM

Mathcad doesn't do very well if you try to best fit five unknowns all in one go in this situation, so I've done the tau fit separately. See attached.

Alan

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01-10-2020
09:08 AM

01-10-2020
09:08 AM

Re: Anyway to use the Mathcad minerr function with a recursive equation?

Something like the attached perhaps? (Note the results are very sensitive to the initial guess for K).

Alan

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01-10-2020
10:00 AM

01-10-2020
10:00 AM

Re: Anyway to use the Mathcad minerr function with a recursive equation?

Dr. Stevens,

This is almost what I was looking for.

Note that tau represents a delay and that Mathcad would "find" the optimum delay. The purpose of this research is to investigate the oscillatory behavior of intravenous (IV) albumin in humans using a delay differential equation which is based upon the Hutchinson equation.

I appreciate your help with this tremendously. I invite you to be a co-author on this paper once it is completed.

Sincerely,

Glen Atlas, MD, MSc

Professor

Dept. of Anesthesiology

Rutgers New Jersey Medical School

Newark, NJ

and

Adjunct Clinical Professor

Dept. of Biomedical Engineering

Stevens Institute of Technology

Hoboken, NJ

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01-10-2020
12:00 PM

01-10-2020
12:00 PM

Mathcad doesn't do very well if you try to best fit five unknowns all in one go in this situation, so I've done the tau fit separately. See attached.

Alan

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01-10-2020
02:26 PM

01-10-2020
02:26 PM

Re: Anyway to use the Mathcad minerr function with a recursive equation?

Dr. Stevens,

Kindly send me your contact information and credentials: glenatlasmd@gmail.com

I would like to have you as a co-author on this project. Thank you very much!

Professor

Dept. of Anesthesiology

Rutgers New Jersey Medical School

Newark, NJ

and

Adjunct Clinical Professor

Dept. of Biomedical Engineering

Stevens Institute of Technology

Hoboken, NJ