2012-09-12 07:08:56 +0200 | received badge | ● Commentator |
2012-09-12 07:08:56 +0200 | commented answer | Laplace of the differential of another variable in sage All right |
2012-09-10 10:16:46 +0200 | commented answer | Laplace of the differential of another variable in sage Sorry, I did not ask for permission from my professor before posting it. He told me the code still needs some work. He will contribute it to Sage as a contributor himself when it works reasonably well. |
2012-09-10 10:13:45 +0200 | answered a question | Laplace of the differential of another variable in sage Sorry, I did not ask for permission from my professor before posting it. He told me the code still needs some work. He will contribute it to Sage as a contributor himself when it works reasonably well. |
2012-09-09 12:14:00 +0200 | commented answer | Laplace of the differential of another variable in sage Sorry, I did not ask for permission from my professor before posting it. He told me the code still needs some work. He will contribute it to Sage as a contributor himself when it works reasonably well. |
2012-09-09 11:43:24 +0200 | answered a question | Laplace of the differential of another variable in sage xxxxxxxxxxxx |
2012-08-22 23:38:49 +0200 | commented answer | Laplace of the differential of another variable in sage All right:) |
2012-08-21 23:04:03 +0200 | commented answer | Laplace of the differential of another variable in sage But, as I run in Maxima:laplace(diff(f(x,t),x),t,s),it seems to output the correct answer:'diff('laplace(f(x,t),t,s),x,1). Thus there might be something wrong in sage. |
2012-08-21 09:32:02 +0200 | received badge | ● Editor (source) |
2012-08-21 09:19:44 +0200 | marked best answer | Laplace of the differential of another variable in sage As best I can tell, it looks like Sage is doing the chain rule here. So, it is treating I think Sage is using Maxima to do this. So, this might be an issue with how Maxima handles partial derivatives of Laplace transforms. |
2012-08-21 09:19:40 +0200 | commented answer | Laplace of the differential of another variable in sage Yeah, it can account for such a result. I think maybe there is something in maxima to be improved. Thank you! |
2012-08-21 05:47:19 +0200 | asked a question | Laplace of the differential of another variable in sage Why did the diff(y.laplace(t,s),x) come out to be |
2012-08-20 05:29:31 +0200 | received badge | ● Supporter (source) |
2012-08-20 05:29:15 +0200 | marked best answer | How to read this code? Here is what I get. gives Within this expression, the meanings are: $\frac{\partial y}{\partial t}$ = $\frac{\partial y}{\partial x}$ = $\frac{\partial^2 y}{\partial t^2}$ = $\frac{\partial^2 y}{\partial x^2}$ = So, You can check the first one above by doing |
2012-08-20 05:29:11 +0200 | marked best answer | How to read this code? What you're seeing is the displayed notation for symbolic partial derivatives. |
2012-08-20 05:29:11 +0200 | received badge | ● Scholar (source) |
2012-08-19 21:44:41 +0200 | commented answer | How to read this code? Excuse me, but I have a small question about the code that is :Why did the diff(y.laplace(t,s),x) come out to be D[0](laplace)(y(x, t), t, s)*D[0](y)(x, t)? Could you help me? |
2012-08-19 09:59:47 +0200 | commented answer | How to read this code? I got it. Thanks! |
2012-08-19 02:53:54 +0200 | commented answer | How to read this code? I think they are different between -D[0](Laplace)(y(t,x),t,s)*D[1,1](y)(t,x)-D[0,0](laplace)(y(t,x),t,s)*D[1](y)(t,x)^2 and -D[1,1]L(y(t,x),t,s). |
2012-08-18 03:24:47 +0200 | commented answer | How to read this code? But,shouldn't it be :s^2*L(y(t,x),t,s)-s*y(0,x)-D[0](y)(0,x)-D[1,1]L(y(t,x),t,s). on the left side? |
2012-08-16 22:29:28 +0200 | asked a question | How to read this code? In sage, I performed the laplace transformation: and got such a code: Can someone tells me what |