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Mar
20
comment Data Table Manipulation
Actually, I find SQL based constructs more natural. May be that is why LINQ is so popular in C#. en.wikipedia.org/wiki/Language_Integrated_Query LINQ extends the language by the addition of query expressions, which are akin to SQL statements, and can be used to conveniently extract and process data from arrays, enumerable classes, XML documents, relational databases, and third-party data sources. I do not see why Mathematica can't have LINQ added to it with an API on top it.
Mar
17
revised How to embed a movie into a Mathematica-made presentation?
make the code appear on the screen instead of a loooong line
Mar
15
reviewed Approve Symbolic solution of irrational equation
Mar
15
comment I want to create an arrow so that my output of my program will indicate 2 Sin x is the plotted graph
why did you delete your question here mathematica.stackexchange.com/questions/44062/… right after I answered it?
Mar
15
revised How to label the coordinates of the plotted graph?
added 509 characters in body
Mar
15
answered How to label the coordinates of the plotted graph?
Mar
14
answered Integral not being evaluated
Mar
13
awarded  Nice Answer
Mar
12
comment Convert variable into function
h = 3*s - 1; f[s_] := Evaluate@h; then f[3]
Mar
12
comment Why does a variable become real when using the second argument of Dynamic?
@Szabolcs sorry, I did not.
Mar
12
comment Computing Smith Normal form of a matrix with mod p coefficients
I was just wondering why there is still no build-in function in reference.wolfram.com/language/guide/MatrixPredicates.html for the function you wrote above diagonalMatrixQ? Should not this predict be also a build-in function in Mathematica?
Mar
11
comment Are there some other ways to solve a second PDE except DSolve?
and get a solution with conditions, but I don't know whether it is correct. You can always substitute the solution back in the PDE and see if it satisfies it? Or since you used Maple, you can use pdetest maplesoft.com/support/help/Maple/view.aspx?path=pdetest
Mar
11
revised Question about NDSolve
clean code
Mar
11
comment Question about NDSolve
Please post a fully self contained non-working example that one can copy/paste and run to show the problem including any numerical values used.
Mar
10
comment Plotting Zeros of a Complex Variable
The code I used is on my office computer You are saying you do not have GoToMyPc installed? (I hear this commerical ad on radio for gotomypc , the techguy show) and thought this is good time to say it :)
Mar
10
reviewed Approve Importing and manipulating data in HDF format
Mar
10
comment NDSolve example - analytical vs numerical solution. How to specify initial conditions?
How did you get that Analytic solution is easy to obtain: y[t] = a Sqrt[t] ? If the analytical solution is easy to find, why then not use DSolve? and get a general solution, then you can find the constant of integrations later. But using your solution even using w=1, I get eq = y[t]^-3 == y[t]/t^2 + y''[t]; sol = a Sqrt[t]; sol^(-3) - w^2 sol/t^2 - D[sol, {t, 2}] which is not zero.
Mar
10
awarded  Nice Answer
Mar
8
comment Euler's method for system of differential equation
k[t_, x_, y_] := -y why is this function defined to accept t and x if they do not appear in the body of the function? v[t_, x_, y_] := (x - 2 y)/2, same here. Where is t is the RHS?
Mar
8
comment Euler's method for system of differential equation
f[x_, y_, t_] := y; why would you pass in x and t to the function f if they are not used in the body of the function? g[x_, y_, t_] :=0.5x+0.5y and here, t is not used in the body of the function, so why is it passed? if you have the problem description you are trying to solve from the source, can you post it? I am having hard time seeing what you are trying to do.