- #1
Pacopag
- 193
- 4
Hello everyone;
This is my first time in the physics forums, or any forum for that matter, so please accept my apologies if I am posting this in the wrong place.
I have just installed grtensorII into Maple 11. I am running it on Fedora 7. The install seems to have worked, although I did have to tweak some of the commands (compared to those in the install guide, which I guess was written for windows users) in order to get it to work. I can load the libraries, and I can load most of the pre-defined objects (e.g. Schwarzschild geometry, Ricci tensor, Christoffel, etc). My problem arises when I try to define new tensors. Even if I enter examples straight from the manual exactly as they are written, it spits out errors at me. Here's an example:
grdef ( 'u{a} := [0,f(r),0,g(r)]' ):
Here I am just trying to define a covariant vector, where the functions f(r) and g(r) are specified, but this just doesn't work. I am getting the syntax from Document D: Defining new Tensors, Section 5, Number 9, from the documentation that comes with GRtensor II.
There also seems to be a problem when I try to define a tensor with contravariant indices because the 'carat' character causes maple to think that I want to enter an exponent. If I override this with \^, it gives me an "invalid power" error.
Any help?
This is my first time in the physics forums, or any forum for that matter, so please accept my apologies if I am posting this in the wrong place.
I have just installed grtensorII into Maple 11. I am running it on Fedora 7. The install seems to have worked, although I did have to tweak some of the commands (compared to those in the install guide, which I guess was written for windows users) in order to get it to work. I can load the libraries, and I can load most of the pre-defined objects (e.g. Schwarzschild geometry, Ricci tensor, Christoffel, etc). My problem arises when I try to define new tensors. Even if I enter examples straight from the manual exactly as they are written, it spits out errors at me. Here's an example:
grdef ( 'u{a} := [0,f(r),0,g(r)]' ):
Here I am just trying to define a covariant vector, where the functions f(r) and g(r) are specified, but this just doesn't work. I am getting the syntax from Document D: Defining new Tensors, Section 5, Number 9, from the documentation that comes with GRtensor II.
There also seems to be a problem when I try to define a tensor with contravariant indices because the 'carat' character causes maple to think that I want to enter an exponent. If I override this with \^, it gives me an "invalid power" error.
Any help?
