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J
JasonC1-Visitor
1-Visitor
January 27, 2017
Solved

Parametrizing "Minimize"

  • January 27, 2017
  • 3 replies
  • 2513 views

Hello all,

Below is a snapshot of an illustration of something I'm trying to do.  .xmcd file is attached.

TIA

parametrize.PNG

Best answer by Werner_E

> I guess I need to arrange the variables so that I either optimize a, or a and b. (and never b alone) ??

You simply could define a new function with rearranged arguments which calls the original function:

Another option could be to solve for all arguments of the function and use a solve block to keep some arguments at the wanted constant value:

3 replies

J
JasonC1-VisitorAuthor
1-Visitor
January 28, 2017

plot thickens:
param 2.PNG

W
Werner_E25-Diamond I
25-Diamond I
January 28, 2017

The order of the arguments in func matters!

The searched for one has to be the first:

The name of the actual parameter does not matter at all:

J
JasonC1-VisitorAuthor
1-Visitor
January 28, 2017

Thanks. But what if I want to search for the 2nd variable and fix the first to some constant?

I have a giant function with around 5 input variables, say a,b,c,d,e.
At one point in my sheet I need to optimize for a and b, where c, d, and e are parametrized/fixed. (meaning c, d, and e do change).

At another point I need to optimize for b, and a,c,d,and e are parametrized/fixed.

I guess I need to arrange the variables so that I either optimize a, or a and b. (and never b alone) ??

W
Werner_E25-Diamond IAnswer
25-Diamond I
January 28, 2017

> I guess I need to arrange the variables so that I either optimize a, or a and b. (and never b alone) ??

You simply could define a new function with rearranged arguments which calls the original function:

Another option could be to solve for all arguments of the function and use a solve block to keep some arguments at the wanted constant value:

J
JasonC1-VisitorAuthor
1-Visitor
January 28, 2017

> I guess I need to arrange the variables so that I either optimize a, or a and b. (and never b alone) ??


The above worked for me.

And if I had wanted to optimize 'b', then your above reply is the correct method.


Thanks and Cheers!

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