http://www.mapleprimes.com/questions/41823-Help-With-A-Possible-Improper-Integral- en-us 2026 Maplesoft, A Division of Waterloo Maple Inc. Maplesoft Document System Sat, 13 Jun 2026 20:01:05 GMT Sat, 13 Jun 2026 20:01:05 GMT The latest answers and comments added to the Question, Help With A Possible Improper Integral (What Is The Error Function, erf(x) ?) http://www.mapleprimes.com/images/mapleprimeswhite.jpg http://www.mapleprimes.com/questions/41823-Help-With-A-Possible-Improper-Integral- http://www.mapleprimes.com/questions/41823-Help-With-A-Possible-Improper-Integral-?ref=Feed:MaplePrimes:Help With A Possible Improper Integral (What Is The Error Function, erf(x) ?):Comments#answer78120 The Maple symbol for infinity is the full name 'infinity'. With that in your worksheet, the integral comes out as <maple>1/4*A^2*h^(1/2)/a^(1/2)/m^(1/2)</maple> (after a simplify), which is probably what you are looking for? By the way, the error function (see ?erf) is defined to be the cumulative density function for the Gaussian, which otherwise does not have a closed-form. In other words, it is essentially the 'name' for the input integral you gave! The Maple symbol for infinity is the full name 'infinity'. With that in your worksheet, the integral comes out as <maple>1/4*A^2*h^(1/2)/a^(1/2)/m^(1/2)</maple> (after a simplify), which is probably what you are looking for? By the way, the error function (see ?erf) is defined to be the cumulative density function for the Gaussian, which otherwise does not have a closed-form. In other words, it is essentially the 'name' for the input integral you gave! 78120 Thu, 22 Feb 2007 07:48:27 Z JacquesC JacquesC http://www.mapleprimes.com/questions/41823-Help-With-A-Possible-Improper-Integral-?ref=Feed:MaplePrimes:Help With A Possible Improper Integral (What Is The Error Function, erf(x) ?):Comments#answer78119 Thanks. That is very useful information that I think I would probably never concluded using the maple help. I'll try your suggestion, and again thanks. dc Thanks. That is very useful information that I think I would probably never concluded using the maple help. I'll try your suggestion, and again thanks. dc 78119 Thu, 22 Feb 2007 07:53:58 Z dcasimir dcasimir http://www.mapleprimes.com/questions/41823-Help-With-A-Possible-Improper-Integral-?ref=Feed:MaplePrimes:Help With A Possible Improper Integral (What Is The Error Function, erf(x) ?):Comments#comment85890 I also tried plotting this function, and kept getting empty plot errors. Any hints ? v/r, Dan I also tried plotting this function, and kept getting empty plot errors. Any hints ? v/r, Dan 85890 Thu, 22 Feb 2007 20:15:17 Z dcasimir dcasimir http://www.mapleprimes.com/questions/41823-Help-With-A-Possible-Improper-Integral-?ref=Feed:MaplePrimes:Help With A Possible Improper Integral (What Is The Error Function, erf(x) ?):Comments#comment91192 You need to be more precise, since <code>plot(erf(x),x=-5..5)</code> works fine for me. What exactly are you trying to plot that is failing? You need to be more precise, since <code>plot(erf(x),x=-5..5)</code> works fine for me. What exactly are you trying to plot that is failing? 91192 Fri, 23 Feb 2007 04:14:23 Z JacquesC JacquesC http://www.mapleprimes.com/questions/41823-Help-With-A-Possible-Improper-Integral-?ref=Feed:MaplePrimes:Help With A Possible Improper Integral (What Is The Error Function, erf(x) ?):Comments#comment91193 Sorry, I'm trying to plot either the expression: square, which is just the function psi(x) multiplied by itself. or the function psi(x) itself. I think it's the constants in those expressions causing the problems. Thanks, Dan Sorry, I'm trying to plot either the expression: square, which is just the function psi(x) multiplied by itself. or the function psi(x) itself. I think it's the constants in those expressions causing the problems. Thanks, Dan 91193 Fri, 23 Feb 2007 05:54:24 Z dcasimir dcasimir http://www.mapleprimes.com/questions/41823-Help-With-A-Possible-Improper-Integral-?ref=Feed:MaplePrimes:Help With A Possible Improper Integral (What Is The Error Function, erf(x) ?):Comments#comment91194 Sorry About not "tidying" the worksheet, and precisely stating my request. v/r, Sorry About not "tidying" the worksheet, and precisely stating my request. v/r, 91194 Fri, 23 Feb 2007 05:56:02 Z dcasimir dcasimir