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Mar
21
awarded  Popular Question
Jan
29
awarded  Yearling
Jan
7
comment How to write this code as a pure function?
This gives some answer: MapThread[Insert, {#, Table[0, {Length[#]}], Table[2, {Length[#]}]}] &[ls]
Jan
3
answered How to avoid 0 OverVector[F] to be evaluated as 0?
Nov
14
comment Check an inequality if one condition holds
The Reduce command says what for real parameters the statement is false: Reduce[{A < 1, Abs[[Beta]] < Abs[1 + 4 [Alpha]]}, {[Alpha], [Beta]}, Reals]
Nov
14
comment Check an inequality if one condition holds
What is assumed about $\alpha$ and $\beta$?
Oct
13
comment Integral of DiracDelta giving an unusual answer
Seems to be a bug. In V9 this produces the same answer. This Integrate[DiracDelta[a - x], {x, a - 1, b}, Assumptions -> {a, b} \[Element] Reals] - Integrate[DiracDelta[a - x], {x, a - 1, a}, Assumptions -> {a, b} \[Element] Reals] gives $\theta (b-a)-\theta (0)$.
Oct
12
comment Integral of DiracDelta giving an unusual answer
It's not. For Integrate[DiracDelta[x], {x, 0, 1}] Mma gives $\delta (0)$. But the value of $\int_0^1 \delta (x) \, dx$ is not defied. So what do you call the correct evaluation of the this integral? In the standard definition delta-function is not supposed to act on discontinuous functions.
Oct
11
comment Integral of DiracDelta giving an unusual answer
The result seems to incorrect, more specific command Integrate[DiracDelta[a - x], {x, a, b}, Assumptions -> a < b] gives HeavisideTheta[0]. But the question itself is incorrect, since delta-function is not well-defined on discontinuous function and Mma is asked about the application of $\delta[a-x]$ on the step HeavisideTheta[a-x].
Jan
29
awarded  Yearling
Jul
2
awarded  Curious
Feb
15
awarded  Nice Answer
Feb
10
revised How to increase range in Plot without exceeding maximum bounds?
fixed code formatting
Feb
10
suggested approved edit on How to increase range in Plot without exceeding maximum bounds?
Feb
4
answered Partial differential equation with initial conditions
Feb
3
comment Creating a function as a table of derivations
@Pygmalion g = Function[D[f@@args,#]&/@args//Transpose//Evaluate]
Feb
3
comment Creating a function as a table of derivations
@Pygmalion One can use Function to get a function out of it. I've edited the answer.
Feb
3
revised Creating a function as a table of derivations
added 18 characters in body
Feb
3
answered Creating a function as a table of derivations
Jan
31
comment DSolve cannot solve for certain branches of the solution help pls
One way is to try for numerical values of parameters. If for all constants say, equal to one, Mma couldn't find a solution, there seems to be no sense trying the general case. At least before solving a concrete system.