A bit of fortran and GR

I finally got off my ass and figured out how to use arrays and matrices in fortran, beginning from how to write them and read them and so on. I was trying to implement a simple linear algebra solution, that we had already done in C and python. I was frustrated most of the time because of the inconsistency in using the various loops, in defining variables and so on. I don't know how much ANSI C has changed in the last 10 years but from the looks of it, Fortran has. But I did find an interesting implicit method to read arrays in the in the mess, very functional and minimalistic.

On the other hand, as I've been doing over the weekend, I shall continue to write about the various metrics used in GR and their relevant christoffel connection symbols, reimann tensors and ricci tensor and ricci scalars. I read grtiny.pdf or the No-Nonsense introduction to general theory of relativity by Sean Carroll and was spurred on by it a little. But in general, I want to document all of this, preferably online, because I am bound to forget most of the things and I don't want to have to do all of the bull work over and over again.

I have an exam tomorrow so I'll get started on a couple of side projects tomorrow. Until then...

Popular posts from this blog

Arxiv author affiliations using Python

So, I wanted to get author affiliation information from papers on arXiv. arXiv provides with an API to bulk query their database and get information. Following that, I look for the attribute 'arxiv:affiliation' in the html data. Here's the code - import urllib from BeautifulSoup import BeautifulStoneSoup   url = 'http://export.arxiv.org/api/query?search_query=all:astro&start=0&max_results=1000'   data = urllib.urlopen(url).read() soup = BeautifulStoneSoup(data) #print(soup.prettify()) #list = soup.findAll('arxiv:affiliation') #for i in range(len(list)): #        print list[i].contents   test = [tag.string for tag in soup.findAll('arxiv:aiffiliation')] Now, the problem I'm having is that I'm getting affiliation of all authors which I want to split into sets of affiliations of authors of a paper, which I'm stuck on at the moment. Once I get that part, I can move on to the next part of this pet project, displaying these...
Read more

You need to start writing Architecture Decision Records

If you write software, you need to start maintaining Architecture Decision Records (ADRs). ADRs roughly fall into the category of Developer Documentation. They aren't aimed at the Users of the software. Instead, they are aimed at the developers and maintainers of the software. They usually contain information about the layout of the package and what the code does. ADRs, in this context, are an absolute necessity. By definition, ADRs are simply a Record of a Decision that has an impact of the Architecture of the application. In fact, Any meaningful technical decision made in a software project, irrespective of whether it has an impact on the architecture of the application, needs to be documented. I first came across ADRs in Chapter 17 of Fundamentals of Software Architecture book. A few of us (at Enthought ) read this book earlier in the year and ADRs are one of the things that we took away from the book. You can find more information on ADRs here and here . Here's what the f...
Read more

Talk proposals submitted in Dec 2024

So far, I've submitted talk proposals for three FOSS conferences. See the list of conferences and my proposals below. I'm expecting to submit a couple of more proposals for PyConf Hyderabad - a talk proposal on the GIL-ectomy (that I presented internally for a client), a talk proposal about the fossunited.org platform that we have been building at FOSS United, and a workshop proposal on the Frappe Framework that powers fossunited.org! Why am I sharing this here? Because not all of my talk proposals get accepted at conferences but that doesn't mean that the ideas or talks are useless. In fact, I've been wondering for a couple of years now that if a talk proposal gets rejected, I should just livestream the talk on my own personal YouTube channel instead of letting the idea die. This post is me taking one step in that direction. PyConf Hyderabad by HydPy community - 22-23 Feb 2025  DEVCONF India by Red Hat India - Feb 28, March 1 2025 FOSSMeet'25 by FOSS Cell NITC -...
Read more