Tim Cinel

Circuits with voltage and current sources *Unsolved*

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It seems that the Java Runtime Environment installer doesn’t automatically add the binary path of java and javac to the system environment variables, so the ‘java’ and ‘javac’ commands can’t be used without a path. For example, when you type “javac test.java” while in your test project directory, you might get the following message:

‘javac’ is not recognized as an internal or external command, operable program or batch file.

The solution to this problem is pretty simple and should take less than two minutes to solve, so let’s solve it… (more…)

“Again with the maths…” Thursday on the train home, I was trying to solve a maths exercise - I am given A, B and C. I was asked to solve D so that ABCD formed a parallelogram. Where did I start? Here’s what I originally thought:

• kBC = AD (The top and bottom edges should be parallel)
• |AB| = |CD| (The two sides would be the same length)

I couldn’t think of any more rules to help me, so I gave made a note of it, then moved on. It wasn’t long until I’d be at it again, and this time I’d solve it. (more…)

Being the complete twit I am, over the last three days I’ve spent about … one hour, maybe two … trying to work out the coordinates of the midpoint between two points on a 3 dimensional Cartesian plane, using vector addition. It’s all better now, though. (more…)

Last week I got stuck working on basic differentiation - it was the implicit differentiation that threw me. This sentence in particular:

“In these cases [when an equation can't be transposed to make y the subject and you are finding the derivative of y with respect to x], y needs to be solved as a function of x”

Now I get it. You have to treat y as if it were x, but a little bit differently. So if:
y = 2y + 5

Instead of saying:
dy/dx = 2 (wrong)

You need to do this:
dy/dx =  2y’

So that problem I couldn’t solve last week - I totally solved it. I smashed the shit out of it. I can’t be bothered getting it and scanning it though, so if you don’t believe me go to hell.

So I said to the guy, “Hey, that’s my daughter!”
Group laughs

One of my subjects, “Enterprise Engineering”, requires us to form a group to work on a project. Since my group only really gets together once a week, I used this as an excuse to install something I’ve wanted to for ages - ProjectPier. After registering this domain, it was the first thing I set up. ProjectPier was really impressive - it is just as good as, if not better than 37 Sinals’ “Basecamp”, except it’s free! But I soon realised that ProjectPier wasn’t so great…

ProjectPier after setting up, creating projects, adding tasks and changing the theme.
You really should change the theme, the default one’s a bit 90’s.

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