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Hi N,Back when was at college (long ago) Vectors were renamed Phasors (it was well before Startrek!).
Why have they 'cropped' up?.
Hi R,A vector is a combination of amplitude and direction (or angle or phase etc.)
e.g. 30 miles an hour is a speed or amplitude, but has no directional component.
30 mph north-west or 10m/sec at 77' are vectors.
Likewise voltage at a phase angle relative to another voltage or offset from zero.
You add vectors by trigonometry, starting each new one to be added at the end of the previous one.
(eg. one not on a single axis can be thought of as the hypotenuse of a triangle; working out the base & height gives the x & y offsets, for a 2D one.)
Hi R,An "interrupt vector" is just a pointer or link from a specific event to the program routine that handles the specific event.
A list of addresses in the program for each possible interrupt handler routine, with some types of CPUs.
If you are using a compiler of some sort, that probably fills the (hidden) table entries for you, when you supply the handler routine names in your program.
A VNA can resolve a complex impedance into its resistive and reactive components.VECTOR NETWORK ANALYSER
Hi J,A VNA can resolve a complex impedance into its resistive and reactive components.
For example,
When we say "50 Ohms impedance" we are ideally wanting 50 Ohms pure resistance.
But if we have a circuit which has 40 Ohms of resistance and 30 Ohms of reactance (from a capacitor or inductor) connected in series, the combined resistance will be 50 Ohms.
It will also have a phase angle of 41 degrees, leading (capacitive) or lagging (inductive).
A VNA will tell you how much resistance and how much capacitance/inductance, and the impedance and its phase angle.
JimB
Hi R,
A bit advanced for me, but in the case you mention, here are the PIC VECTORs.
C
Hi N,Well that explains your confusion, you're looking at entirely different things - one reason perhaps that (mathematical) Vectors were renamed Phasors?. As far as the PIC goes, when you see 'Vector' substitute it with 'Address' instead - might make it clearer.
I did Vectors in maths at school for O Level, then a couple of years later at college we did them again, but called Phasors by that time.
Hi N,
So far I am in the naive stage, so haven't yet got confused, only bewildered.
I have a program called INKSCAPE that uses SVG (Scalable Vector Graphics) When a line is drawn, there are pull lines, so that the line can be made into a curve, if stretched, then the curve stretches.
I imagine that in the NANO_VNA the will be curves, that are changed by information coming in, from say the antenna.
As you say the PIC example is strange, that it would be better understood by using 'Address' instead of VECTOR., but why do they use VECTOR then?
Thanks,
C.
Vector...I'm first trying to understand Vectors, as a building block before the VNA arrives, then think about how they are used in a VNA, and PIC programming.
Hi Dr P,A vetctor in a processor is a hard coded goto, on power up the processor needs to 'know' what to do, or should I say where to go, so its programmed on power up reset to jump to a certain location, at that location is usually another jump or goto command which points to the very start of its program or operating system.
Interrupts are the same, only triggered by software ir pinchange, avr's have several vectors that they can jump to.
Vector as in vna is very different, and enough has already been saud about those.
Hi Dr P,
Ok, thanks.
As mentioned the processor VECTOR is misnamed, as it's not much to do with the real use of VECTORS.
C.
Hi N,There are three dictionary definitions for vectors, the one relating to aircraft I mentioned early seems to apply quite well.