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Sep
2
answered Importing High Precision (22 digits) data from a file
Aug
29
comment Can Mathematica solve 625 linear coupled differential equations?
since I saw the question on s.o. - there you mentioned something about symbolic parameters. Still an issue?
Aug
29
comment Neumann boundary conditions in NDSolve over nontrivial region
I suspect the natural Neumann b.c. is just what you have observed ( zero gradient, which in this case is not zero flux ). That is to say the result is correct and the issue lies in the docs if they claim natural==zero flux. (My guess they only make that claim in the context of examples w/o the potential term ).
Aug
29
comment What are the upper bound and stability conditions for the following simple linear system
This does not appear to be a mathematica question. You might want to try math.stackexchange.com
Aug
28
revised Problem with integral equations
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Aug
28
answered Problem with integral equations
Aug
28
comment Problem with integral equations
Are you saying you want to vary the A in the Width block?
Aug
28
revised Problem with integral equations
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Aug
28
revised InterplationOrder, ListPlot3D and using AbsoluteOption to find value used. Slow using InterpolationOrder
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Aug
28
answered InterplationOrder, ListPlot3D and using AbsoluteOption to find value used. Slow using InterpolationOrder
Aug
27
comment How to solve three equations with four unknowns iteratively?
In principle, plug the N1L expression into N2L, then plug both into the etha equation so that you have a single equation in the unknown etha(with R as a parameter), then use FindRoot. In practice your numbers are very large ( vLinf*(PL - Psat1)/(k*T) ~10^20 ) so you need to work on normlising things to avoid numeric overflow .
Aug
27
revised Specifying initial conditions for a PDE
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Aug
27
answered Specifying initial conditions for a PDE
Aug
24
comment Trying to solve simultaneous equations based on format found on official website
you should easily work through this by hand if you dont believe the mathematica result.
Aug
24
comment Trying to solve simultaneous equations based on format found on official website
try Reduce ..
Aug
22
answered Help with coding triangular nodes/elements
Aug
22
revised Horizontally compress a picture with varying compression ratio
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Aug
22
revised Horizontally compress a picture with varying compression ratio
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Aug
22
answered Horizontally compress a picture with varying compression ratio
Aug
21
comment Example of Integrate applying a numerical evaluation N
Thats different. The numeric x makes things that depend on x numeric as expected. There is no reason for Integrate to numericize the constant. Anybody thinks this makes sense explain why Integrate[a[1] x , {x, 0, 1.}] leaves the constant alone while Integrate[a[1] + x , {x, 0, 1.}] evidently applies N to it..