Magnetic Flux intensity calculation using Mathematica [Archive]

Edgar Y. Lobachevskiy

Sep14-04, 01:16 PM

Bill Rowe

Sep15-04, 03:52 AM

<jabberwocky><div class="vbmenu_control"><a href="jabberwocky:;" onClick="newWindow=window.open('','usenetCode','toolbar=no, location=no,scrollbars=yes,resizable=yes,status=no ,width=650,height=400'); newWindow.document.write('<HTML><HEAD><TITLE>Usenet ASCII</TITLE></HEAD><BODY topmargin=0 leftmargin=0 BGCOLOR=#F1F1F1><table border=0 width=625><td bgcolor=midnightblue><font color=#F1F1F1>This Usenet message\'s original ASCII form: </font></td></tr><tr><td width=449><br><br><font face=courier><UL><PRE>\nIn article <chrsrm\\$nf0\\$1@news.hawaii.edu>,\n"Edgar Y. Lobachevskiy" <lobachev@hawaii.edu> wrote:\n\n> Did anyone try to use Mathematica to calculate the magnetix flux intensity\n> of a rectangular magnetic block at an arbitrary point xyz? I am using the\n> formulat\n\n> H = -1/4pi*Integral [n\' . M\' (r_vector-r\'_vector) da\'/(r_vector-r\'_vector)^3]\n\n> I have seen the result done using mathematica, but when I try to evaluate\n> this integral on my computer the mathematica has been taking about 4 hours\n> and still did not produce any results? Is there a trick to this problem?\n\nA couple of comments. You will probably get a more useful response if\nyou post this question to comp.soft-sys.math.mathematica, a moderated\ngroup devoted to discussion of Mathematica. And when you do so, it would\nbe useful if you posted what you actually typed into Mathematica and\ndetails of what response you got.\n\nFor example in Mathematica, the syntax r_vector refers to an object\nnamed r with head vector. Unless you have defined vector you are going\nto have problems since no built in system object will have such a head.\n\n--\nTo reply via email subtract one hundred nine\n</UL></PRE></font></td></tr></table></BODY><HTML>');"> <IMG SRC=/images/buttons/ip.gif BORDER=0 ALIGN=CENTER ALT="View this Usenet post in original ASCII form">  View this Usenet post in original ASCII form </a></div><P></jabberwocky>In article <chrsrm$nf0$1@news.hawaii.edu>,
"Edgar Y. Lobachevskiy" <lobachev@hawaii.edu> wrote:

> Did anyone try to use Mathematica to calculate the magnetix flux intensity
> of a rectangular magnetic block at an arbitrary point xyz? I am using the
> formulat

> H = -1/4pi*Integral [n' . M' (r_{vector}-r'_vector) da'/(r_{vector}-r'_vector)^3]

> I have seen the result done using mathematica, but when I try to evaluate
> this integral on my computer the mathematica has been taking about 4 hours
> and still did not produce any results? Is there a trick to this problem?

A couple of comments. You will probably get a more useful response if
you post this question to comp.soft-sys.math.mathematica, a moderated
group devoted to discussion of Mathematica. And when you do so, it would
be useful if you posted what you actually typed into Mathematica and
details of what response you got.

For example in Mathematica, the syntax r_{vector} refers to an object
named r with head vector. Unless you have defined vector you are going
to have problems since no built in system object will have such a head.

--
To reply via email subtract one hundred nine