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Results tagged with numerics
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user 26956
Questions on the numerical functions of Mathematica, implementing numerical methods and numerical computing with Mathematica.
2
votes
EvenQ not working properly on IntegerPart[real number]
IntegerPart[0.57*100]
(* 56 *)
0.57*100
(* 57. *)
InputForm@%
(* 56.99999999999999 *)
- 11.5k
1
vote
SetPrecision and setting precision with a backtick
@LLlAMnYP, the goal is to enter numbers with a certain precision prec. The only problem is that entering all numbers in the format as required by Mathematica is really cumbersome. I want it to be a …
- 11.5k
4
votes
How to force precision in region plots containing Erfc
Use the relation Erfc[x] == 1 - Erf[x]. The two argument form of Erf is specifically to tackle these precision issues:
ContourPlot[Erf[x, y] == 0, {x, -12, 0}, {y, -12, 0}]
Erf[z0, z1] gives the …
- 11.5k
3
votes
Numerical 3D Integration in Mathematica
The integral over a spherical region is easily performed by Mathematica even analytically. Assuming f=1 and for brevity putting the center of the sphere at the origin:
Timing@Integrate[1, {x, -r, +r} …
- 11.5k
3
votes
The algorithm behind InputForm for machine numbers
This section of my answer previously showed that Export[fname, data, "TSV"] is incredibly slow (~500 seconds for exporting 10^5 * 10 reals), but this is easily worked around by WriteString[fname, Exp …
- 11.5k