• Next math carnival will be here on squareCircleZ

    Updated: 2011-10-31 14:13:40
    The next Mathematics and Multimedia blog carnival will be here next week.

  • Reading Excel data is easy with JGR and XLConnect

    Updated: 2011-10-31 02:53:06
    Despite the fact that Excel is the most widespread application for data manipulation and (perhaps) analysis, R's support for the xls and xlsx file formats has left a lot to be desired. Fortunately, the XLConnect package has been created to fill this void, and now JGR 1.7-8 includes integration with XLConnect package to load .xls [...]

  • A month of Math Software – October 2011

    Updated: 2011-10-30 10:50:07
    #leftcontainerBox { float:left; position: fixed; top: 60%; left: 70px; } #leftcontainerBox .buttons { float:left; clear:both; margin:4px 4px 4px 4px; padding-bottom:2px; } #bottomcontainerBox { height: 30px; width:50%; padding-top:1px; } #bottomcontainerBox .buttons { float:left; height: 30px; margin:4px 4px 4px 4px; } Welcome to this month’s ‘A month of Math software.’  If you missed the September edition then why not take a look at http://www.walkingrandomly.com/?p=3534. All previous editions can be found at the Month of Math Software Archives.  If you have some mathematical software news for the November 2011 edition then feel free to contact me. General Mathematics [...]

  • Small exercice about finite groups

    Updated: 2011-10-29 23:01:23
    The theory of finite groups is full of little, weird exercises. Here is one of them. It seems quite simple... Try it out! Is it true that every automorphism of a finite group, which sends at least half of the elements of the group to their inverses, is an involution?...

  • Breaking news: Maple on iPad!

    Updated: 2011-10-26 16:33:28
    #leftcontainerBox { float:left; position: fixed; top: 60%; left: 70px; } #leftcontainerBox .buttons { float:left; clear:both; margin:4px 4px 4px 4px; padding-bottom:2px; } #bottomcontainerBox { height: 30px; width:50%; padding-top:1px; } #bottomcontainerBox .buttons { float:left; height: 30px; margin:4px 4px 4px 4px; } Typical…I leave my iPad at home and this happens I can’t WAIT to try this out.  Blog post from Maplesoft about it at http://www.mapleprimes.com/maplesoftblog/127071-Maple-And-The-IPad?sp=127071 May I be the first to ask “When is an Android version coming out?”

  • Addi – A MATLAB clone for Android phones and tablets

    Updated: 2011-10-25 21:52:25
    #leftcontainerBox { float:left; position: fixed; top: 60%; left: 70px; } #leftcontainerBox .buttons { float:left; clear:both; margin:4px 4px 4px 4px; padding-bottom:2px; } #bottomcontainerBox { height: 30px; width:50%; padding-top:1px; } #bottomcontainerBox .buttons { float:left; height: 30px; margin:4px 4px 4px 4px; } Back in May 2010, The Mathworks released MATLAB Mobile which allows you to connect to a remote MATLAB session via an iPhone.  I took a quick look and was less than impressed since what I REALLY wanted was the ability to run MATLAB code natively on my phone.  Many other people, however, liked what The [...]

  • MATLAB mex functions using the NAG C Library in Windows

    Updated: 2011-10-24 16:58:55
    #leftcontainerBox { float:left; position: fixed; top: 60%; left: 70px; } #leftcontainerBox .buttons { float:left; clear:both; margin:4px 4px 4px 4px; padding-bottom:2px; } #bottomcontainerBox { height: 30px; width:50%; padding-top:1px; } #bottomcontainerBox .buttons { float:left; height: 30px; margin:4px 4px 4px 4px; } The NAG C Library is one of the largest commercial collections of numerical software currently available and I often find it very useful when writing MATLAB mex files.  “Why is that?” I hear you ask. One of the main reasons for writing a mex file is to gain more speed over native MATLAB.  However, one of [...]

  • A great triangle exploration

    Updated: 2011-10-22 14:47:32
    Mr. Honner has a great exploration at his blog. It starts with a simple question, that has subtlety and depth to it: How do you determine the "equilateralness" of a triangle? Can you compare two triangles and determine which is more equilateral than the other? The post introducing the investigation is here. I encourage you [...]

  • Seeking interesting math factoids about the number 11

    Updated: 2011-10-19 23:58:45
    I'll be doing a brief talk at a conference next month, on 11/11/11 at 11:11AM, about the number 11. If you know interesting factoids about 11 (or about 1111...) that I could include in the talk I'd greatly appreciate it. One factoid is that 1/(1+(1/(1+1/(1+... converges to the golden ratio. Another is that if a [...]

  • Check out “A Cultural Paradox: Fun in Mathematics”

    Updated: 2011-10-16 18:12:47
    A while back I received this email from Jeff Zilahy. Dear Mr. Lederman, I came across your blog, Wild about Math, and I too share your enthusiasm for the world of mathematics. In fact, I wrote a popular math book last year that I wanted to bring to your attention. It is called "A Cultural [...]

  • Bad pun

    Updated: 2011-10-16 14:43:35
    From the great Math humor blog, Patrick at Math Joke 4 Mathy Folks, writes: Feeling a little hungry, f(x) = x^2 + 3 walks into a restaurant. “Got any sandwiches?” he asks. “Sorry,” says the waiter, “we don’t do catering for functions.”

  • Scaling: another look

    Updated: 2011-10-11 01:56:19
    I just got a copy of Scaling, a book by G. I. Barenblatt on the use of similarity and dimensional analysis and so called "intermediate asymptotics". The idea is that for many physical systems there is a domain of the dynamic variables in which the solution has become essentially independent of the initial conditions, but [...]

  • Probability of overlapping sub-sequences?

    Updated: 2011-10-08 15:47:20
    #leftcontainerBox { float:left; position: fixed; top: 60%; left: 70px; } #leftcontainerBox .buttons { float:left; clear:both; margin:4px 4px 4px 4px; padding-bottom:2px; } #bottomcontainerBox { height: 30px; width:50%; padding-top:1px; } #bottomcontainerBox .buttons { float:left; height: 30px; margin:4px 4px 4px 4px; } Consider a periodic sequence, seqp, with period p seqp = a1, a2, …, ap,  a1, a2, …, ap,  a1, a2, …, ap, … Two sub-sequences, each of length N where 2< N< p, are produced by choosing two random start points in seqp and using the next N-1 numbers. What is the probability that these two sub-sequences will [...]

  • A practical math test

    Updated: 2011-10-07 20:15:27
    From xkcd. Hat tip to Jon McLoone.

  • Stephen Wolfram on Steve Jobs and his influence on Mathematica

    Updated: 2011-10-06 21:41:02
    Stephen Wolfram wrote a nice article on his personal blog: Steve Jobs: A Few Memories.

  • A Month of Math Software – September 2011

    Updated: 2011-10-04 00:17:12
    #leftcontainerBox { float:left; position: fixed; top: 60%; left: 70px; } #leftcontainerBox .buttons { float:left; clear:both; margin:4px 4px 4px 4px; padding-bottom:2px; } #bottomcontainerBox { height: 30px; width:50%; padding-top:1px; } #bottomcontainerBox .buttons { float:left; height: 30px; margin:4px 4px 4px 4px; } Welcome to September’s A Month of Math Software.  Last month’s can be found here and the archive is here.  If you’ve got news for next month’s edition then contact me. General mathematics and statistics The commercial computer algebra package, MAGMA, has been upgraded to version 2.17-11.  The change log is at magma.maths.usyd.edu.au/magma/releasenotes/2/17/11/ Version 2011b of MATLAB has been [...]

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