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T
tburch1-Visitor
1-Visitor
March 11, 2016
Question

Why the change in nonlinear curve-fitting from Mathcad 2000 to 15

  • March 11, 2016
  • 2 replies
  • 1342 views

I've been doing curve fitting to the logistic function as applied to population growth.  The relevant function was miner() in the older version, but was changed in 15. What was the reason for this change?

2 replies

W
Werner_E25-Diamond I
25-Diamond I
March 11, 2016

Not sure what you mean. You can still create your own fit using a solve block to minimize the residuals using minerr() if feel like doing so.

Think that you will have to be more specific if you ran into a problem using an older sheet or the like.

You may also use genfit() and for your convenience lgsfit() is available, too.

But if you prefer a self-made solution using minerr() you are still free to do so. Could it be a misspelling? You wrote miner()  instead of minerr().

Why do you think that something has changed and, most important, what has changed in your opinion?

I used Mathcad a lot at the times of version 2001, but I can't remember which functions were already implemented and which came later.

WE

T
tburch1-VisitorAuthor
1-Visitor
March 12, 2016

Thanks for that. I stand corrected re minerr in MC 15.  Must have had a senior moment or two.

My recollection was that I got an error message when I tried to use minerr -- must have been some other problem with syntax.

TKB

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