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18h
revised Problem with integral equations
added 179 characters in body
19h
answered Problem with integral equations
19h
comment Problem with integral equations
Are you saying you want to vary the A in the Width block?
19h
revised Problem with integral equations
added 120 characters in body
22h
revised InterplationOrder, ListPlot3D and using AbsoluteOption to find value used. Slow using InterpolationOrder
added 2 characters in body
22h
answered InterplationOrder, ListPlot3D and using AbsoluteOption to find value used. Slow using InterpolationOrder
1d
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 .
1d
revised Specifying initial conditions for a PDE
added 180 characters in body
2d
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
added 177 characters in body
Aug
22
revised Horizontally compress a picture with varying compression ratio
added 144 characters in body
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..
Aug
21
comment Export Grayscale Bitmap
confirmed by file size check: FileByteCount[Export["test.bmp",Image[RandomReal[255,{1000,1000}],"Byte"]]]/1.*‌​^6 -> 1.001
Aug
21
comment Export Grayscale Bitmap
In fairness most of the opts are documented only under Import. This one point : " Export creates a BMP file with indexed color [... ] if the ColorMap element is specified. " seems to be just wrong however.
Aug
21
comment Export Grayscale Bitmap
After playing with this a good bit looking at file sizes, the only thing that actually produces a one byte per pixel file is @SimonWoods approach of converting the type to Byte before Export sees it. (That is to say the documented options simply do not work )
Aug
20
awarded  Yearling