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3h
comment MatrixExp[] of a complex matrix of size about 10000 by 10000
You should really state your problem and your ultimate goal by giving specific Mathematica code to reproduce the issue. If you tell us what you really want to achieve, it could be that you'll get a completely different answer that makes your large matrices unnecessary. As it is written, the question cannot be answered except by blind guessing, which is unlikely to be useful.
10h
comment How to get the desired (equivalent) answer from Integrate?
Closely related: Order of integration changes output of indefinite multiple integral in Mathematica 7
1d
comment intermediate steps of a Mathematica operation
Related: Showing steps for TrigExpand. But I think this question is not related to an actual issue encountered while programming in Mathematica. Perhaps you should show what you've already tried.
1d
comment Generating and Imaging of the water molecules with Graphics3D
Closely related: Using ChemicalData to make molecule graphics. It's probably a duplicate (I can't find anything that makes water fundamentally different.
1d
comment I want a mix matrix
The problem is underspecified because the table indices are not listed in any particular order.
1d
reviewed Leave Open All value types for a symbol?
1d
reviewed Close NonlinearModelFit::nrnum error
1d
reviewed Close Fixing “incompatible shapes” when multiplying arrays
1d
comment Implementing Picard's Iteration for solving ODEs
@Guesswhoitis. Happy to hear that you found a good use for this...
2d
comment Derivative of vector dot product with respect to a vector
OK, then I initially misunderstood your question. It's not a duplicate of the Q I linked earlier.
2d
comment Derivative of vector dot product with respect to a vector
It's easier for people to get started on this if you give examples of gvecI and x. Otherwise it's not clear if they have values at all, or are supposed to be just symbols about which we make certain assumptions.
2d
comment Derivative of vector dot product with respect to a vector
Some quantities are undefined and their dimensions thus unclear. In the absence of that info, my best guess is that this is a possible duplicate of Quick Hessian matrix and gradient calculation?, specialized to n=1 (i.e., first derivatives).
2d
comment All value types for a symbol?
Just one issue to keep in mind (maybe related to the missing Messages, too): Attributes of built-in functions can be misleading unless you evaluate the function to force auto-loading of missing information. See here. So in other words, you can't always get accurate information about the language before actually using it...
2d
comment Sections with unidirectionally shared variables
All I can say is: start section 1 with this: Clear[Evaluate[Context[]<>"*"]]. This will allow the symbolic stuff to always work. Trying to fix an existing notebook to do everything you asked is probably not realistic.
2d
comment How can I remove the decimals in the frame ticks?
Looking back at the question, it occurred to me that you may just be looking for Round instead of trimPoint. The difference is that trimPoint allows a certain number of significant digits including before and after the decimal point. This is why in the above example only the larger numbers are turned into integers. Round outputs integers for all ticks.
2d
revised How can I remove the decimals in the frame ticks?
Corrected description
2d
revised How can I remove the decimals in the frame ticks?
syntax corrected, tag added
2d
answered How can I remove the decimals in the frame ticks?
2d
comment Sections with unidirectionally shared variables
Closely related Q&A: Context unique to each group at a specified level - seems clear to me that Contexts are the way to go - but the current question is asking if it can be done without them. Anything is possible, but I wouldn't do it.
2d
comment Sections with unidirectionally shared variables
By the way, I think it's a valid question because it the notebook paradigm leads to exactly this kind of confusion very frequently.