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xzczd
  • Member for 11 years, 9 months
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66 votes
2 answers
7k views

Analogue for Maple's dchange - change of variables in differential expressions

58 votes
3 answers
6k views

Is manual adjustment of AccuracyGoal and PrecisionGoal useless?

36 votes
8 answers
3k views

Insert $+$, $-$, $\times$, $/$, $($, $)$ into $123456789$ to make it equal to $100$

34 votes
1 answer
2k views

Has this implementation of FDM touched the speed limit of Mathematica?

33 votes
2 answers
956 views

Why is CompilationTarget -> C slower than directly writing with C?

26 votes
4 answers
727 views

How does Internal`CompareNumeric work?

25 votes
3 answers
605 views

Backslide of Limit

25 votes
2 answers
3k views

I failed to solve a set of one-dimension fluid mechanics PDEs with NDSolve

24 votes
2 answers
590 views

What can be inlined by "InlineExternalDefinitions" -> True?

23 votes
1 answer
1k views

Numerical inverse Laplace-Hankel transform

22 votes
2 answers
1k views

NDSolve uses different difference order for different spatial derivative when solving PDE

21 votes
4 answers
1k views

What's wrong with this FFT-based Von Kármán vortex street simulation?

21 votes
2 answers
2k views

Least effort to handle a point source inside the domain of PDE(s)

21 votes
3 answers
1k views

How to solve the liar problem?

19 votes
2 answers
1k views

What boundary is added when boundary condition is not sufficient?

19 votes
3 answers
615 views

Generate coefficient array from general formula of linear equation system

18 votes
1 answer
514 views

When does NDSolve parallelize ODE system solving?

18 votes
1 answer
2k views

Can I OCR Mathematica code on an image?

17 votes
1 answer
953 views

Save a C compiled function without losing the blessing of C compiler

16 votes
2 answers
663 views

Does NRoots own an abstract counterpart? If not, can we write one?

16 votes
2 answers
2k views

The only usage for the option InterpolationOrder in NDSolve is to be set to All?

16 votes
4 answers
3k views

Plot MATLAB icon

16 votes
3 answers
591 views

Reveal the formal PDE of FiniteElement

16 votes
2 answers
314 views

Silent change (bug?) of Join after v9

14 votes
2 answers
1k views

A more convenient Fourier series

14 votes
2 answers
478 views

Bad performance of LengthWhile?

13 votes
2 answers
2k views

In what situation is the use of Directive required?

13 votes
1 answer
2k views

Possible Method for MatrixExp

12 votes
2 answers
231 views

Why NIntegrate is badly-behaved on $J_{\frac{9}{2}}(x)$ by default?

12 votes
1 answer
182 views

Strange behavior of UpSetDelayed together with MakeBoxes