Problemania

1,195 reputation

317

bio	website	problemania.org
	location	Problemania
	age
visits	member for	1 year, 3 months
	seen	May 14 at 21:52
stats	profile views	94

A moderator at Wiki site http://problemania.org where a group of enthusiasts enjoying sharing the fun solving mathematics, physics, and computing problems. We primarily work on problems found in college/grad school text books.

Web page: http://problemania.org

Twitter: http://twitter.com/#!/problemania

Github: https://github.com/Problemania

E-mail: problemaniac@gmail.com ( NOT problemania@gmail.com )

	1,195 reputation	bio	website	problemania.org	visits	member for	1 year, 3 months
317 badges		location	Problemania		seen	May 14 at 21:52

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Dec 15	asked	How to generate a picture like this?
Nov 16	comment	How to read data file quickly? Any idea how to make this also work on Windows?
Oct 31	awarded	Teacher
Oct 31	answered	Is it possible to print more than last line with Get (<<) without using Print commands?
Oct 29	comment	Implementing a For (?) or series or loop (?) for individual results for every x to n Can't you import the whole spreadsheet (.xls etc.) and manipulate the data in Mathematica session then write them back, rather then read 2 rows each time?
Oct 29	revised	How to find local minima of a multivariate function with singularity? deleted 1 characters in body
Oct 29	comment	How to find local minima of a multivariate function with singularity? I'm still not exactly sure why converting `Indeterminate` to `$MaxMachineNumber` is safe that no $-\infty$ will not be mistakenly converted.
Oct 29	comment	How to find local minima of a multivariate function with singularity? Could you explain a little that why when Sigmoid returns exactly 0 or 1, there will then be a `Indeterminate`? Is it that `y_i - Sigmoid[...]` is somehow used as a denominator in the computation?
Oct 29	revised	How to find local minima of a multivariate function with singularity? deleted 1 characters in body
Oct 29	revised	How to find local minima of a multivariate function with singularity? deleted 1 characters in body
Oct 29	accepted	How to find local minima of a multivariate function with singularity?
Oct 29	comment	How to find local minima of a multivariate function with singularity? @acl: Added data set.
Oct 29	revised	How to find local minima of a multivariate function with singularity? added 4545 characters in body
Oct 28	revised	How to find local minima of a multivariate function with singularity? added 461 characters in body
Oct 27	revised	How to find local minima of a multivariate function with singularity? edited title
Oct 27	asked	How to find local minima of a multivariate function with singularity?
Oct 10	comment	What's a good data structure to represent a, b, a and b, a or b? Had to admit, I didn't expect `MemberQ["a" && "b", "a"]` to return `True`. Ok. Thanks!
Oct 10	comment	What's a good data structure to represent a, b, a and b, a or b? If using `{{"a", "b"}}` and `{{"a"}, {"b"}}`, i can use `MemberQ` to test existence of "a" and/or "b". If using `"a" && "b"` and `"a" \|\| "b"`, what's good way to do such tests?
Oct 10	comment	What's a good data structure to represent a, b, a and b, a or b? Expressions `"a" && "b"` and `"a" \|\| "b"` are a little harder to compute with than say `{{"a", "b"}}` and `{{"a"}, {"b"}}`.
Oct 10	comment	What's a good data structure to represent a, b, a and b, a or b? @celtschk Thanks, you seem to understand what I want and have trouble to explain.