
Re: How to properly use constraints and rules followed by Mathcad's Solver
AlanStevens Dec 16, 2013 8:40 AM (in response to ptc5232076)In doing your check calculations you have changed the value of alpha!
Might be better done as in the attached.
However, as specified, there is no unique solution. For example, try initial guesses for t, H and y1 of 0.2, 0.25 and 0.22 respectively. The resulting solution is different from those arising from your initial guesses, but they still meet your criteria.
Alan

Solverexampleb.mcdx.zip 3.9 K

Re: How to properly use constraints and rules followed by Mathcad's Solver
ptc5232076 Dec 16, 2013 10:14 AM (in response to AlanStevens)Hi Alan,
Thanks, I missed the alpha change that must have happend when I was playing around iwth it.
With that being said is there any way to get the solver to display multiple possible solutions if not all that it can find in a particular range?
Thanks,
Adam

Re: How to properly use constraints and rules followed by Mathcad's Solver
AlanStevens Dec 16, 2013 12:49 PM (in response to ptc5232076)adam miller wrote:
With that being said is there any way to get the solver to display multiple possible solutions if not all that it can find in a particular range?
Thanks,
Adam
There are an infinite number of solutions. If you look at the following picture you can see there are two solutions that satisfy the criteria (i.e. 2 values where the blue line hits 8500 and where the red line is between 8000 and 8500, and where t is between 0.05 and y1) . If you make minute changes to t and H you will get more. By making the changes as small as you like, you can see there are an infinite number. You would need to specify exact values for t and H (or y1) to get a finite number of solutions.
Alan

Solverexamplec.mcdx.zip 7.4 K

Re: How to properly use constraints and rules followed by Mathcad's Solver
AlanStevens Dec 16, 2013 1:22 PM (in response to AlanStevens)Here, for example, several results are determined for a range of values of t and H.
(Also, because there are sometimes multiple solutions for single values of t and H (as in the image in my previous post) the solution found by the solver may depend on the initial guess for y1.)
Alan

Solverexampled.mcdx.zip 4.2 K



