Need some Help with MathCad :)

Hey all, Just wondering if anyone uses mathcad prime 1.0?

I'm using it at the moment and trying to find the co-efficients of an 8th order polynomial using boundary conditions.

if anyone can help me set up and solve this equation it would be much appreciated! :)

Thanks!

Here is the equation:

(@EQ (@LABEL VARIABLE L) (+ (+ (+ (+ (+ (+ (+ (+ (* (@LABEL VARIABLE A) (^ θ 8)) (* B (^ θ 7))) (* C (^ θ 6))) (* D (^ θ 5))) (* E (^ θ 4))) (* F (^ θ 3))) (* G (^ θ 2))) (* H θ)) I))

Ok cant just copy paste I see!

Re: Need some Help with MathCad :)

Are the various values of randomly spaced or are they evenly spaced ? What do you mean by boundary condotions in this context ?

Re: Need some Help with MathCad :)

I have only 3 boundary conditions:

if x= 90 then L= 11.5, if x=45 then L=11.5/2 if L=0 then x=0

As for how the constants are spaced I have no idea.

x is actually theta but I couldnt find that here. x is an angle

Its for a Cam design project

Re: Need some Help with MathCad :)

You have nine unknown coefficients, that means that you need nine pairs of values for and to determine all of them uniquely.

Re: Need some Help with MathCad :)

Re: Need some Help with MathCad :)

Guess some inbetween Ls and x's?

Re: Need some Help with MathCad :)

You could do if that is acceptable to your design. Can you make use of symmetry in some way ? Is it symmetrical about some axis ? If you do manage to generate some more points, calculations are easier if the values are equally spaced. BTW, I know nothing about MathCad. What we are talking about is independent of MathCad (or any other calculating device).

Re: Need some Help with MathCad :)

Awesome, thanks Bob, I'm sure there is a way to do this I just don't know what I'm about really! :) Thanks for your help Bob- I will see if i can gather more info before I bother you guys again! Sorry about this. :)

Re: Need some Help with MathCad :)

With your specified 3 boundary values it is possible to eliminate 3 of coefficients and obtain the following result: