Hello.. Apologies if this appears twice. I tried to post a question yesterday but it did not go through.
I am new to Mathcad so I am sure this is a trivial question for the experts.
I am building a program which manipulates a bunch of 1x400 vector arrays then integrates 2 of the arrays (Runge-Kutta). The final result of one of the integrations is then minimized with respect to frequency. No problem with minimizing a simple analytic function, but I must have a bad syntax here.
So I built a simple exercize below to make it easier to see my mistake.
Given
Where am I going wrong?
Thanks, Al
To minimize P with respect to f, P must be a function of f. That's easy enough to do, but then it's clear that there is no real minimum: as f increases, P decreases:
Maybe you just made the example too simple though, and your real function does have a minimum. In which case you can find it with minimize(P,f)
OK, I tried to follow Richard's suggestion, and I made some progress. I also inserted a simpler function, which has a minimum at .577. But I am still getting the error msg when I try to minimize.
BTW, the program I am building is for modeling the acoustic behavior of a recorder. I have had very good success doing it in Excel. But now I want to add viscous and thermal losses, so I need to use complex impedances. Thus the switch to Mathcad, because Excel is so cumbersome for complex quantities.
I have attached the file.
Thanks in advance, Al
Minimize expects just the function name, P, as the first argument. So you should have just P, not P(f). However, you have defined P in such a way that it returns a vector, and using P[10 as the function name will not work. So you need this:
Are you really trying to find the minimum of P with respect to f? or just where the minimum is for a given f?
Stuart
