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May
26
reviewed Approve Mismatch between numerical and analytic evaluation of an integral
May
26
revised Solve wave equation using DSolve?
added 15 characters in body
May
26
revised Solve wave equation using DSolve?
added 2343 characters in body
May
26
comment Solve wave equation using DSolve?
@kattern As to the The actual situation: is a solution involving unevaluated InverseLaplaceTransform acceptable?
May
26
comment Solve PDE with DiracDelta function
In v9.0.1, DSolve returns unevaluated after a warning. For the FourierTransform part: unlike LaplaceTransform, currently FourierTransform isn't handy. To circumvent this, here's a shell for enhancing. But what's really troublesome is: the ODE isn't defined in a infinite domain, so Fourier transform can't be used directly, theoretically one can extend the domain in cycles with e.g. Mod, but personally I never succeeded in the subsequent step: perhaps a artificial periodic function is too hard for FourierTransform, I'm not sure.
May
25
revised Solve wave equation using DSolve?
add some explanation.
May
25
revised How can I solve this PDE with initial conditions?
added 3 characters in body
May
25
revised Solve wave equation using DSolve?
deleted 266 characters in body
May
25
revised How can I solve this PDE with initial conditions?
added 243 characters in body
May
25
revised Solve wave equation using DSolve?
wrap the procedure into a function
May
25
answered Solve wave equation using DSolve?
May
20
comment Save a C compiled function without losing the blessing of C compiler
@OleksandrR. Er…are you sure? I just tested the code in this answer, and funcNew apparently makes use of the DLL even if I restart Mathematica: i.stack.imgur.com/gIqig.png
May
19
accepted Possible Method for MatrixExp
May
19
comment Can Mathematica be used for developing “normal” stand-alone software?
Related: mathematica.stackexchange.com/q/37888/1871
May
19
comment Laplace transform of $\frac{1-\cos (t)}{t}$
Well, are you sure that LaplaceTransform[f[t], t, 2 s] is always equal to LaplaceTransform[f[t/2], t, s]?
May
19
revised Proving (or at least 'being told by Mathematica') that Sqrt[2] is irrational?
The In[2] is miscopied, right?
May
18
asked Possible Method for MatrixExp
May
17
awarded  Popular Question
May
16
comment Analogue for Maple's dchange - change of variables in differential expressions
How about adding one more syntax dChange[expresion, rule, {oldVars}, {newVars}, {functions}] that will internally make use of CoordinateTransform instead of Solve? Then one can do something like Assuming[{r > 0, -Pi < θ < Pi}, dChange[D[f[x, y], x, x] + D[f[x, y], y, y] == 0, "Cartesian" -> "Polar", {x, y}, {r, θ}, f[x, y]]]
May
13
revised Inverse Laplace Transform difficulty
edited tags