Re: [sympy] Solution of small system of equations grows past manageability

2016-06-22 Thread janoscharlipp
Sorry if i am being imprecise, but actually i cant describe it better than in my opening post. I want X, Y and Phi in terms of everything else. Maybe i was wrong in assuming that i could simply pass sympy the system of equations and it would deliver the solutions in a form that i could then use

Re: [sympy] Solution of small system of equations grows past manageability

2016-06-15 Thread Oscar Benjamin
On 14 June 2016 at 20:30, wrote: > I had the same idea earlier, but i dropped it because my intuition was, that > three quadratic equations are worse than three linear and one quadratic > equation :-) > > Since you brought this approach up again, i tried it now, but sympy does not > seem to find

Re: [sympy] Solution of small system of equations grows past manageability

2016-06-14 Thread janoscharlipp
I had the same idea earlier, but i dropped it because my intuition was, that three quadratic equations are worse than three linear and one quadratic equation :-) Since you brought this approach up again, i tried it now, but sympy does not seem to find a solution. You can check out my code here

Re: [sympy] Solution of small system of equations grows past manageability

2016-06-12 Thread Oscar Benjamin
On 11 June 2016 at 17:52, wrote: > > Yes, exactly, its the linear bearings that can be at different locations and > force therefore the board to different positions, those are the ones that i > am interested in! Rather than thinking about x, y and theta think about the three pin positions. Give

Re: [sympy] Solution of small system of equations grows past manageability

2016-06-11 Thread janoscharlipp
Yes, exactly, its the linear bearings that can be at different locations and force therefore the board to different positions, those are the ones that i am interested in! On Saturday, June 11, 2016 at 6:49:34 PM UTC+2, Jason Moore wrote: > > If the blue dots are fixed on the board, doesn't the l

Re: [sympy] Solution of small system of equations grows past manageability

2016-06-11 Thread Jason Moore
If the blue dots are fixed on the board, doesn't the linear bearings remove all degrees of freedom? I don't see how this thing can move. Jason moorepants.info +01 530-601-9791 On Sat, Jun 11, 2016 at 8:57 AM, wrote: > They describe the location of the board (the blue rectangle) in relation > t

Re: [sympy] Solution of small system of equations grows past manageability

2016-06-11 Thread janoscharlipp
They describe the location of the board (the blue rectangle) in relation to its "normal" position by a rotation about an angle of phi and a translation of x and y. On Saturday, June 11, 2016 at 5:40:26 PM UTC+2, Jason Moore wrote: > > Where are phi, x, y on the diagram? > > > Jason > moorepant

Re: [sympy] Solution of small system of equations grows past manageability

2016-06-11 Thread Jason Moore
Where are phi, x, y on the diagram? Jason moorepants.info +01 530-601-9791 On Sat, Jun 11, 2016 at 6:35 AM, wrote: > I guess its hard to get from my description, so i uploaded a drawing to > visualize the physical problem: http://pasteboard.co/1Bvt53hY.png > > Thanks for your interest! > > > >

Re: [sympy] Solution of small system of equations grows past manageability

2016-06-11 Thread janoscharlipp
I guess its hard to get from my description, so i uploaded a drawing to visualize the physical problem: http://pasteboard.co/1Bvt53hY.png Thanks for your interest! On Saturday, June 11, 2016 at 3:13:52 PM UTC+2, janosc...@gmail.com wrote: > > > Physically, the rows of A are three points fixed o

Re: [sympy] Solution of small system of equations grows past manageability

2016-06-11 Thread janoscharlipp
Physically, the rows of A are three points fixed on a movable board. These points run freely in three linear bearings which are placed on a fixed base. The linear bearings are described in hesse normal form in the rows of matrix C. The robust motion matrix B is the transformation which transf

Re: [sympy] Solution of small system of equations grows past manageability

2016-06-11 Thread Alan Bromborsky
Physically what are all the matrices. Do A and C also describe rotations. Please give the actual physics problem as well as the resulting math. On Sat, Jun 11, 2016 at 6:37 AM, wrote: > My description was a little compressed, so i had to clean up the code to > match my description again ... > T

Re: [sympy] Solution of small system of equations grows past manageability

2016-06-11 Thread janoscharlipp
My description was a little compressed, so i had to clean up the code to match my description again ... The code is available here: http://pastebin.com/MMW3B88h I hope its readable for you. Am Donnerstag, 9. Juni 2016 20:24:35 UTC+2 schrieb Jason Moore: > > Can you please share the code so we c

Re: [sympy] Solution of small system of equations grows past manageability

2016-06-09 Thread Jason Moore
Can you please share the code so we can see what you are doing? Jason moorepants.info +01 530-601-9791 On Wed, Jun 8, 2016 at 11:58 PM, wrote: > I am trying to solve a system of equations with sympy that arises from a > constraint of the form: > > (A x B) x C = D > > where > > * A, B, C and

[sympy] Solution of small system of equations grows past manageability

2016-06-09 Thread janoscharlipp
I am trying to solve a system of equations with sympy that arises from a constraint of the form: (A x B) x C = D where * A, B, C and D are 3x3 matrices * the diagonal of D should be zero * B is a "rigid motion 2D" transformation, with elements cos(phi), +-sin(phi), x and y * A and C are full