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As a not really math familiar individuum, every time I read a math related article and find some matrix formulas I need a mnemonic to imagine what is described there (if they refer e.g. to a matrix element like Aij). In german this mnemonic is "_Z_eile _z_uerst, _Sp_alte _sp_äter" what means "Row first, Column later".
What kind of mnemonic do non German speaking people use?
And yes; no the answer "not german speaking" do not need a mnemonic is out of question
It does not solve my Problem, but it answers my question
Yes, I think the convention of row-first is well established. Of course the underlying mathematics doesn't care where you spray them round the page.
I remember ordering as being the natural counting sequence
11 12 13 ...
21 22 23 ...
and it accords with the "across the row, down the column" summation in matrix multiplication. The mental image of two forefingers scanning like that is burned into my brain.
If only mathematicians could become zero-based. So often in matrix maths there are subscript expressions like p+q-1
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
Me and the wife are a bit baffled, and trying to work out what is going on.
This morning, she got a missed call from me on her mobile (android). Problem is at the time stamp, my mobile was powered off, in my backpack, sat in my office on the platform, a room which has no mobile signal. She is in Cyprus, I am in Qatar (well actually halfway between Saudi and Iran in Qatari waters north east of Qatar.)
We do have sporadic mobile reception from Qatar mobile operator Ooredoo, but do not know where this is provided from. Whether it is a vessel/rig etc. with a mobile station. Certainly doubt it is reached from the mainland as it full strength signal on my device.
Could this be a spoofing? or has someone cloned my sim or IMEI or can there be some other explanation.
Has anyone any idea how we can determine what the actually elephant has gone on?
It could be spoofing (more likely) or a cloned SIM. Regardless, my concern would be that someone knows that calls are regularly made from your number to your wife's number. They might try to convince her, for example, that they've kidnapped you, the proof being that the call is coming from your mobile, and that she needs to send a ransom payment to wherever.
Spoofing is really bad where I am. I've heard of people getting phone calls from their OWN phone number. A lot of them at the very least have very familiar area codes or prefix to try to get you to answer it.
people getting phone calls from their OWN phone number
That happened to me!
"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
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Someone asked me if I could give any advice about database clustering with PostgreSQL preferably on a Windows platform
It turned out hard to find a solution that was not Linux based, but I found some and added them here: database-cluster-managers[^]
Now I wonder if anybody has ever used something like e.g. SymmetricDS and how it will perform with lots of SQL write and read operations.