151 reputation
7
bio website orlovsoft.com
location Belarus
age 42
visits member for 2 years, 1 month
seen Aug 24 '13 at 16:04

PhD in applied mechanics, Independent software developer

merge keep!


Nov
29
comment Solving a large equation set
@Daniel 10-30 beams-rods with some symbolic data is reality. Just tested. It requires algorithm optimization. I will do it in future for guaranteed partially (or even full) symbolic solution. Thank for support. If you have an interest to take a look on Mathematica power in structural mechanics timo 32 bit Win (32 bit Win) or timo 64 bit Win Installation instructions are included.
Nov
29
accepted Industrial Level Applications. Recipe for mixed notation of equations set
Nov
29
awarded  Scholar
Nov
29
accepted Solving a large equation set
Nov
29
comment Solving a large equation set
Conclusion. Symbolic calculations are very slow for real important engineering tasks in structural analysis. Only very simple tasks can be solved with symbolic data.
Nov
29
comment Solving a large equation set
Is this correct For[i = 1, i <= Length[soln], i++, Unknows[[i]] = soln[[i]]; Print[Unknows[[i]]]] or it exists more elegant way?
Nov
29
comment Industrial Level Applications. Recipe for mixed notation of equations set
Again. Thanks for acl!
Nov
29
awarded  Supporter
Nov
29
comment Solving a large equation set
Thank you, Stephen Luttrell. But what the way to provide back substitution. In case of traditional approach I'v used a phrase ResultSubs=Unknows/.Result. I will be glad to share results and real tasks description it concerns to.
Nov
29
comment Industrial Level Applications. Recipe for mixed notation of equations set
I mean a size of future matrix.
Nov
29
comment Industrial Level Applications. Recipe for mixed notation of equations set
Yes, in code. It works on the fly. My program analyses construction and put on stack equations. I even do not know dimension of possible future matrix. Of course, I can build a matrix, but analysis equations and collecting coefficients is hard process. There is no something like this BuildMatrix[EquationSet]...
Nov
29
awarded  Student
Nov
29
revised Industrial Level Applications. Recipe for mixed notation of equations set
added 237 characters in body
Nov
29
awarded  Commentator
Nov
29
comment Solving a large equation set
It consists of =F= and can not be solved by NSolve. It requires symbolic notation solution.
Nov
29
comment Industrial Level Applications. Recipe for mixed notation of equations set
What is the way to get matrix form of such set? Analyse each coefficient at variable?
Nov
29
asked Solving a large equation set
Nov
29
comment Industrial Level Applications. Recipe for mixed notation of equations set
The problem is at building construction (orlovsoft.com/Silverlight.html#/Screenshots) some data are presented in notation like this -1.5E+04 (-15000). But I can not find any way within Mathematica (NET Link API) to translate it to valid expression.
Nov
29
comment Industrial Level Applications. Recipe for mixed notation of equations set
Yet one thing Vitaliy. I work with numeric data also. What is the way to translate phrase -1.5E+04 in valid Mathematica Input Form notation?
Nov
29
comment Industrial Level Applications. Recipe for mixed notation of equations set
For this notation Solve[Equations, Unknows]