Pdesolve- "Cannot understand this syntax"

[ptc-5700236]

I've started up a worksheet for a project, and I'm having difficulty with a few things. First of all, my pdesolve isn't wanting to solve my pde. It is near the bottom of the page, I've tried solving just one of them for this case. Is there a way to solve them all at the same time?

Also, I'm trying to get my summation equations for x.F and x.P to equal 1, so that they can solve for the missing components. But it won't seem to solve for the last one even if I have all the other components specified. Any tips for this?

Thank you in advance!

[Werner_E]

Is there a way to solve them all at the same time?

The help tells you to put a vector consisting of the 8 function names instead of C1 in the call for pdesolve.

But I guess solving for 8 functions AND 16 variables at the same time is not possible that way.

Also, I'm trying to get my summation equations for x.F and x.P to equal 1,

Simply use the vector summation sign from the matrix palette and directly put the vector with the various variables into it without assigning it a variable first.