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Feel free to correct the grammar mistakes in my posts.


Mar
8
comment Fitting data using a series of Sin and Cos
And to make this fitting success, the index of fitted function should start from $i=0$ :)
Mar
8
answered The output is the same as Input when I add the boundary conditions to a PDE
Mar
7
awarded  Nice Question
Mar
6
comment Fourier transformation of HeavisideTheta functions
I guess it might be related to this and this.
Mar
5
comment Problems with NDSolve and stiffness
Do you mind fixing OP's code in this way? In fact it's not the first time I see this method suggested, but I never find a specific example in this site.
Mar
4
accepted Plot Matlab icon
Mar
3
comment Shooting method for solving 3rd Oder ODE with RK method
Where's the definition of m? Then your equation involves simple mistake, y*(D[y[x], {x, 2}])^2 should be y[x] (D[y[x], {x, 2}])^2. Finally, I tried to set m = 1, and this equation is easily solved by NDSolve.
Mar
2
awarded  Announcer
Feb
28
comment Green functions for recurrence equations
Hello, welcome to mathematica.SE! Then, I think your question will draw more attention if you can make it more specific by giving a example for the problem and some explanation for the concept appearing in your question.
Feb
28
revised Poor performance when evaluating double integral of hat functions
slightly change the rule and improve the code format.
Feb
28
comment Are greek symbols causing different evaluation?
Maybe a similar issue of this? BTW, confirmed in v8.0.4 too.
Feb
28
revised Plot Matlab icon
Add a tag
Feb
28
comment Plot Matlab icon
Er… can you add some instruction for the LaplacianFilter? For me the usage of the 2nd argument isn't so clear.
Feb
28
comment Plot Matlab icon
The link you add is instructive for the understanding of the code, especially this and this part :)
Feb
28
revised Poor performance when evaluating double integral of hat functions
Add a screen shot.
Feb
28
answered Poor performance when evaluating double integral of hat functions
Feb
28
comment Poor performance when evaluating double integral of hat functions
Based on the context of your question, I think there's a typo in the last element of your BasisAssumY i.e. the ΔY should be Δy.
Feb
27
comment Poor performance when evaluating double integral of hat functions
Do you mean that the θ[y, z] and μ[y, z] appearing at the end of the code take the form of your ϕ[y, z] by saying "The p term takes the same form but is represented by μ"? Also, are you aware that Integrate has a syntax for multiple integral e.g. Integrate[Sin[x y], {x, 0, 1}, {y, 0, x}]?
Feb
27
asked Plot Matlab icon
Feb
21
answered FindFit giving weird values on a logistic equation