I want to create a step geometry in LAMMPS, I used these settings:
-0.001 10.000 xlo1 xhi1
-0.050 5.000 ylo1 yhi1
-0.001 10.001 zlo1 zhi1
10.001 40.001 xlo2 xhi2
-1.001 11.001 ylo2 yhi2
-0.001 10.001 zlo2 zhi2
But the code does not know the xlo1 and other names I wrote in front of numbers. Please help me.
Regards
This is because you invented some variables and LAMMPS does not know what to do with them. When using LAMMPS, you are limited to what is in the documentation, unless you want to modify the code yourself.
Thanks, how to create the step in LAMMPS?
Please see my response to your other post. Please also note that it is generally frowned upon in online communities, if people post the same request/topic multiple times. As already explained, the problem of getting help is usually not one of visibility, but one of requests being too cryptic and vague so that nobody understands what is being asked about.
OK. I think my both posts are clear. I want to create a step channel, comprised of two channels where the height of the second one is larger than the first one. I tried to use data given in the first post but it gave error, because LAMMPS does not know the new parameter.
I strongly disagree with this statement, but suit yourself.
You just made up some stuff and that cannot work, which indicates that you not only have a problem understanding how online communities work, but also have a deficit in understanding how software works. You cannot “reason” with software. You must follow the rules given in the documentation. Anything that is not consistent with the documentation will be rejected.
I wonder why do you treat so harshly? You are a represntative of LAMMPS and should treat the people specially those who started the new work much better than this.
What do you expect after ignoring my advice and insisting that you know things better than me? Why do you treat me so harshly? How can you expect being treated with respect, if you don’t show respect yourself?
If you search the forum for “step channel” you will see that that phrase has never been used in a post here, until yours. The majority of posts that have used the word “channel” have attached a drawing, a detailed verbal description, or a reference to a published paper to clarify what exactly they mean.
That search covers 15 years, hundreds of users and tens of thousands of posts, and you are the first person in all that time who has used that phrase.
In all likelihood, you are also the only person here who knows what that phrase means. None of us can help you build something in LAMMPS if we do not actually know what you want to build. Indeed, the more you keep requesting help while using terminology specific to your field (or yourself) that we do not understand, the less likely it is that anyone will want to help.
Furthermore, you need to demonstrate some effort into trying by yourself to understand how LAMMPS works. It’s simply respectful to us volunteers who want to try to help you without any reward to ourselves – but ignore that for now. If you don’t study a bit of LAMMPS for yourself and try to work out why some things work and other things don’t, then how will you know that our suggestions are sensible?
We are strangers on the Internet that you have never met. If we tell you to type something into your computer and press Enter, can you really trust us enough to do that? What if we are evil people who have sent you a code to wipe your hard drive, or randomise your passwords, or turn your computer into a botnet server?
How will you know that LAMMPS isn’t actually an evil virus for infecting scientific computers, unless you do your best to understand it for yourself and study the documentation, and check that the commands listed there work, and the ones that aren’t listed there don’t?
You may be interested in the create_atoms command, especially the region or stl keywords.