1,523 reputation
512
bio website math.upatras.gr/~spawn
location Brazil
age 37
visits member for 2 years, 6 months
seen Mar 21 at 14:49

Mathematics, PDEs, General Relativity and symbolic programming with Mathematica.


Apr
28
comment Plot derivative of integral with changing limits
Use Evaluated->True in Plot.
Apr
26
comment Why does Mathematica give an incorrect answer to this multiple integral?
At v8.04.0 it gives the correct result what's your version?
Apr
26
answered Generating a list of pure variables
Apr
26
comment Distance between two functions satisfying a constraint
When you say $x1$ to come close to $x2$ you mean for one point $t$ or in average?
Apr
26
comment Distance between two functions satisfying a constraint
He wants between $0<t<0.15$
Apr
26
comment How to expand a general expression in cross and dot product in Mathematica
@user1285419 I revert back to my initial answer.
Apr
26
awarded  Cleanup
Apr
26
revised How to expand a general expression in cross and dot product in Mathematica
added 83 characters in body
Apr
26
revised How to expand a general expression in cross and dot product in Mathematica
rolled back to a previous revision
Apr
26
comment How to expand a general expression in cross and dot product in Mathematica
@user1285419 indeed thats why first I attached the rule to Outer.
Apr
25
comment Arrow pointing upwards in a Graphics3D
Just use VectorPlot3D.
Apr
25
revised How to extract the coefficient from an expression
added 8 characters in body
Apr
25
comment Hue function for negative arguments
Why you dont you use Rescale like Rescale[..,{-2,2},{0,1}]? Hue will use the values of its first argument cyclically if they are outside the range $(0,1)$.
Apr
25
comment How to extract the coefficient from an expression
@cmc to create the list vars you can use Cases if it is too long to do by hand.
Apr
25
answered How to extract the coefficient from an expression
Apr
25
comment How to extract the coefficient from an expression
What do you mean?
Apr
25
comment How to extract the coefficient from an expression
Use Coefficient.
Apr
24
comment Partial row reduction of a matrix
Have you tried the methods provided to the function?
Apr
24
comment Can Mathematica check if two expressions give the same output for integer input?
If you denote in Simplify that n is an integer it will simplify it to the form $(-1)^n$.
Apr
24
comment Problem with working precision
@niren outside the input field the setting $PrePrint works just fine, if you want in the output the specific format of course ...