MaplePrimes - Questions and Posts tagged with equation
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en-us2016 Maplesoft, A Division of Waterloo Maple Inc.Maplesoft Document SystemThu, 26 May 2016 16:26:25 GMTThu, 26 May 2016 16:26:25 GMTThe most recent questions and posts on MaplePrimes tagged with equationhttp://www.mapleprimes.com/images/mapleprimeswhite.jpgMaplePrimes - Questions and Posts tagged with equation
http://www.mapleprimes.com/tags/equation
Problem with RootOf
http://www.mapleprimes.com/questions/212629-Problem-With-RootOf?ref=Feed:MaplePrimes:Tagged With equation
<p> </p>
<p>With the following equation</p>
<p>eqn:=y=1/2+(1/2)*erf((1/2)*sqrt(2)*(x-mu)/sigma)-exp(-lambda*(x-mu)+(1/2)*lambda^2*sigma^2+ln(1/2-(1/2)*erf((1/2)*sqrt(2)*(lambda^2*sigma^2-lambda*(x-mu))/(lambda*sigma))));</p>
<p>and with</p>
<p>x:=solve(eqn,x) assuming sigma > 0, lambda > 0;</p>
<p>I got the following solution</p>
<p>x := -(1/2)*(-lambda^2*sigma^2-2*lambda*mu+2*RootOf(-exp(_Z)*erf((1/4)*sqrt(2)*(lambda^2*sigma^2+2*_Z)/(lambda*sigma))+exp(_Z)+erf((1/4)*sqrt(2)*(-lambda^2*sigma^2+2*_Z)/(lambda*sigma))+2*y-1))/lambda;</p>
<p>In order to get rid of RootOf I gave the command:</p>
<p>allvalues(%);</p>
<p>However, RootOf did not disappear. How should I proceed? </p>
<p> </p><p> </p>
<p>With the following equation</p>
<p>eqn:=y=1/2+(1/2)*erf((1/2)*sqrt(2)*(x-mu)/sigma)-exp(-lambda*(x-mu)+(1/2)*lambda^2*sigma^2+ln(1/2-(1/2)*erf((1/2)*sqrt(2)*(lambda^2*sigma^2-lambda*(x-mu))/(lambda*sigma))));</p>
<p>and with</p>
<p>x:=solve(eqn,x) assuming sigma > 0, lambda > 0;</p>
<p>I got the following solution</p>
<p>x := -(1/2)*(-lambda^2*sigma^2-2*lambda*mu+2*RootOf(-exp(_Z)*erf((1/4)*sqrt(2)*(lambda^2*sigma^2+2*_Z)/(lambda*sigma))+exp(_Z)+erf((1/4)*sqrt(2)*(-lambda^2*sigma^2+2*_Z)/(lambda*sigma))+2*y-1))/lambda;</p>
<p>In order to get rid of RootOf I gave the command:</p>
<p>allvalues(%);</p>
<p>However, RootOf did not disappear. How should I proceed? </p>
<p> </p>212629Sun, 22 May 2016 13:54:32 ZAdVen1935AdVen1935Problem with subs command
http://www.mapleprimes.com/questions/211858-Problem-With-Subs-Command-?ref=Feed:MaplePrimes:Tagged With equation
<p>Hello,</p>
<p> </p>
<p>I am unable to use subs() command when using subscript : I'd like to replace YP__1 with dGx in the equation :</p>
<p>"Eq:= YP__1 = Y__2" (Eq:= YP<sub>1</sub>=Y<sub>2</sub>)</p>
<p> </p>
<p> so I have tried : subs({YP__1=dGx},Eq)</p>
<p> </p>
<p>But it doesn't work... It give me : YP__1 = Y__2 and I would like to have dGx = Y__2</p>
<p> </p>
<p>I have tried also with subs({YP[1]=dGx},Eq) but doesn't work too.</p>
<p> </p>
<p>If I am not using subscript, for exemple : Eq:= YP1 = Y2</p>
<p> </p>
<p>And do : subs({YP1=dGx},Eq)</p>
<p> </p>
<p>That works great...</p>
<p> </p>
<p>But I must use subscript __ because Eq is a result from ODEtools (convertsys).</p>
<p> </p>
<p>Can you help me please ?</p>
<p> </p>
<p>Thanks you very much.</p>
<p> </p>
<p>Regards.</p><p>Hello,</p>
<p> </p>
<p>I am unable to use subs() command when using subscript : I'd like to replace YP__1 with dGx in the equation :</p>
<p>"Eq:= YP__1 = Y__2" (Eq:= YP<sub>1</sub>=Y<sub>2</sub>)</p>
<p> </p>
<p> so I have tried : subs({YP__1=dGx},Eq)</p>
<p> </p>
<p>But it doesn't work... It give me : YP__1 = Y__2 and I would like to have dGx = Y__2</p>
<p> </p>
<p>I have tried also with subs({YP[1]=dGx},Eq) but doesn't work too.</p>
<p> </p>
<p>If I am not using subscript, for exemple : Eq:= YP1 = Y2</p>
<p> </p>
<p>And do : subs({YP1=dGx},Eq)</p>
<p> </p>
<p>That works great...</p>
<p> </p>
<p>But I must use subscript __ because Eq is a result from ODEtools (convertsys).</p>
<p> </p>
<p>Can you help me please ?</p>
<p> </p>
<p>Thanks you very much.</p>
<p> </p>
<p>Regards.</p>211858Mon, 02 May 2016 10:04:52 ZrdpdordpdoHow Do I Separate Variables?
http://www.mapleprimes.com/questions/211799-How-Do-I-Separate-Variables?ref=Feed:MaplePrimes:Tagged With equation
<p>When I was editing the head of the question (? instead of .), its body disappeared. Please, insert it again.</p>
<p>Regard,</p>
<p>Markiyan Hirnyk</p><p>When I was editing the head of the question (? instead of .), its body disappeared. Please, insert it again.</p>
<p>Regard,</p>
<p>Markiyan Hirnyk</p>211799Sat, 30 Apr 2016 04:06:56 ZThomas
DeanThomas
DeanSorting one list based on another
http://www.mapleprimes.com/questions/211594-Sorting-One-List-Based-On-Another?ref=Feed:MaplePrimes:Tagged With equation
<p>If L is a list [a,c,b,d,f,e]</p>
<p>S is a list [b,c,f,e]</p>
<p>I want to use the permutation opf S to rearrange L [b,c,f,e,a,d]</p>
<p>In my case a,b,c,d,e,f are equations.</p><p>If L is a list [a,c,b,d,f,e]</p>
<p>S is a list [b,c,f,e]</p>
<p>I want to use the permutation opf S to rearrange L [b,c,f,e,a,d]</p>
<p>In my case a,b,c,d,e,f are equations.</p>211594Sat, 23 Apr 2016 16:56:35 ZRonanRonanPolar equations
http://www.mapleprimes.com/questions/211487-Polar-Equations?ref=Feed:MaplePrimes:Tagged With equation
<p> </p>
<p>Hello</p>
<p> </p>
<p>I will try to be as specific as possible.</p>
<p>On my Ti nspire it is possible for me to calculate polar equations like on the buttom picture with the settings on the upper picture. But when I try this in Maple It is not possible. I have worked my way try for two days now and it does not work for me.</p>
<p>Does any body know how to get this solved? </p>
<p>Regards</p>
<p>Heide</p>
<p> </p>
<p><img src="/view.aspx?sf=211487_question/Document_settings.jpg" alt=""><img src="/view.aspx?sf=211487_question/polar_equation.jpg" alt="" width="625" height="134"></p><p> </p>
<p>Hello</p>
<p> </p>
<p>I will try to be as specific as possible.</p>
<p>On my Ti nspire it is possible for me to calculate polar equations like on the buttom picture with the settings on the upper picture. But when I try this in Maple It is not possible. I have worked my way try for two days now and it does not work for me.</p>
<p>Does any body know how to get this solved? </p>
<p>Regards</p>
<p>Heide</p>
<p> </p>
<p><img src="/view.aspx?sf=211487_question/Document_settings.jpg" alt=""><img src="/view.aspx?sf=211487_question/polar_equation.jpg" alt="" width="625" height="134"></p>211487Wed, 20 Apr 2016 20:23:08 ZÃ˜sterbroÃ˜sterbroHow Do I Print Text Followed by Math Without Commas, Etc.?
http://www.mapleprimes.com/questions/211401-How-Do-I-Print-Text-Followed-By-Math?ref=Feed:MaplePrimes:Tagged With equation
<p>I have checked many Maple pages and I found nowhere the answer to this question.</p>
<p>EQ:= s^2-4*s+1=3;</p>
<p>I need to print the following statement:</p>
<p>The Equation Is: EQ</p>
<p>I need the equation to appear where EQ is.</p>
<p>Thank you guys!</p>
<p>I appreciate it.</p>
<p> </p>
<p> </p>
<p> </p><p>I have checked many Maple pages and I found nowhere the answer to this question.</p>
<p>EQ:= s^2-4*s+1=3;</p>
<p>I need to print the following statement:</p>
<p>The Equation Is: EQ</p>
<p>I need the equation to appear where EQ is.</p>
<p>Thank you guys!</p>
<p>I appreciate it.</p>
<p> </p>
<p> </p>
<p> </p>211401Sat, 16 Apr 2016 13:46:17 Zmapleathamapleatha