The math tag has no wiki summary.
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1answer
109 views
expr command used to work and stopped
I am on SunOS machine trying to get the date string of the past minute, yesterday I used this command I found on the internet
expr `date +%Y%m%d%k%M` - 1
which is worked just fine and I saw the ...
3
votes
4answers
197 views
Round/truncate digit in string in zsh (or with external tool)
I'm trying to do an interface to bc so it can be used intuitively and without the annoyance of getting "stuck" in it. I haven't got around to test it that much, because I got stuck on another detail, ...
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2answers
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How do I convert my old PC to a data logging and presentation terminal?
Take an old PC (e.g. 1.8GHz P4 with 256MB RAM), install e.g. Ubuntu 10.04 LTS on it.
Now go to your PIC or AVR based home project and hook up the thing. With only three connections and the onboard ...
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vote
3answers
99 views
how to type linear algebra symbols
How do I type the symbols for linear algebra on Ubuntu?
Are there any programs that use them? ( I understand this is trivial basket weaving. Whats the fastest way! )
2
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1answer
148 views
Illustrate the difference of two squares via the command line
So, after 10 years of wanting to study the book that Ramanujan relied upon for a lot of his early strides in mathematics, it's 2012, and the book is finally online.
To celebrate, I want to go through ...
22
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9answers
3k views
Addition with 'sed'
I am trying to perform a mathematical operation with sed, but it continues to treat my variables as strings. The input is of this kind:
$ echo 12 | sed 's/[0-9]*/&+3/'
$ 12+3
I'd like to have ...
0
votes
1answer
87 views
Why does octave give different results for 9 ^ 1/2 and 9 ^ 0.5?
Lately I've been trying to brush up on the math I should have learned in high school. (I didn't pay much attention.) Regarding this, college entrance exams and octave make a great pair.
This morning ...
12
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4answers
2k views
Free Matlab equivalent for Linux
My collaborators are using Matlab to do some simulations. Is there an open source alternative I could use on Linux to run these scripts? It would need to be fairly closely compatible with the (1) ...
