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Jul
31
answered I have a problem in plotting simple Exponential Equation?
Jul
28
comment Generating Meshes with Conforming Boundaries for FEM
Do you mean the same number of nodes for the inner and outer circles?
Jul
28
awarded  Popular Question
Jul
27
comment How to apply Simplify only to elements of list that cause specific Warning
If you map Simplify onto your list and it takes much time, than the same is to be expected, if you map the combination Simplify[ReplaceAll[#, {d1 -> 0.045, d2 -> -0.35}]]& . Clearly that not the terms like Sin[x] or Cos[x] give rise to such a timing. This may be the indication that there are terms (those creating your problems) that are much too complex themselves.
Jul
27
comment Pulling out a prefactor from a dot product
You do not need to give your true expressions. It is much better to give minimalistic examples that have only the necessary features of your realistic functions, but are as short as possible. From your question it seems that z is a complex function, but then your example z = Sin[φ]*{Exp[x], Exp[y], Exp[x] Exp[y]} is a bit confusing.
Jul
27
answered How to apply Simplify only to elements of list that cause specific Warning
Jul
21
answered Formatting Tables in Mathematica
Jul
20
comment Jumping between the InputForm and TraditionalForm during Presentation
@ Simon Rochester Yes, this is the possibility, but during the lecture it is not convenient. The question is how to do this with the cursor.
Jul
20
comment Changing one line in code to Traditional Form?
@ Mr.Wizard Done
Jul
20
asked Jumping between the InputForm and TraditionalForm during Presentation
Jul
17
comment List manipulation challenge
If you do it only once, just write it directly as you want: it will be the simplest. If you will apply it to many lists of the same structure, try ReplacePart .
Jul
17
accepted Getting rid of spikes in the PDE solution
Jul
17
comment Getting rid of spikes in the PDE solution
Thank you, I am just in the process of checking the approach with the "ImproveBoundaryPosition" -> False for different values of the holes radii and it presently looks pretty good: no spikes.
Jul
17
comment Why do I need to apply DiscretizeRegion to a derived region to visualize it?
That's a question I also was curious about. @ilian could you possibly explain this in more details, to understand, why it "cannot always be represented..." ? May be you could formulate it then as a regular answer?
Jul
17
answered Multivariable Calculus Chain Rule
Jul
17
comment Changing one line in code to Traditional Form?
@Jens Why not to formulate this as a regular answer? I find it to be of use and not that trivial to leave it as a comment.
Jul
17
comment Changing one line in code to Traditional Form?
@Everybody This rises an interesting question: Is it possible to transform the input expression into the TraditionalForm upon placing a cursor on it, such that it transforms back upon its removal? Indeed, this might be very useful during Mma lecturing for new users.
Jul
16
comment Getting rid of spikes in the PDE solution
Thank you, with the comments it is much clearer. Am I right that your results imply that there is an error in the solution? It seems me that if the number of holes is 0, 1 or 2, this error might not show up or be a very rare event.
Jul
16
answered NDSolveValue and DirchletConditions for cylindrical disk
Jul
15
comment Getting rid of spikes in the PDE solution
@ chris What's wrong with it?