Loop Definition and 1000 Threads

THIS ISN'T WORKING AT ALL! I'm trying to define a matrix M in terms of a predefined matrix N by using the following for loop: For[a=1,a<=12,a++,M[[a,a]]=N[[1,a]]] So I just want the diagonal of M to be the first row of N. But this is not working at ALL. Does anyone see what I'm doing wrong?

I do some rock climbing, and the most common knot you see is the double-figure 8: That's because you can tie it at any point in the rope to create a loop for other climbers to latch into. It also gets tighter as you pull from any direction: the loop or either of the two single ropes coming...

Is it safe to loop the inverter's output neutral to loop with the mains neutal?? Guys, I need a help on this. I thought that it is rather safe to loop one of the output terminal of the inverter to loop with the mains supply inverter, so that there doesn't arise the need of extra neutral wiring...

Homework Statement m= 0.2Kg r=0.6m k= 500N/m x=0.08m the spring is pressed together 0.08m before it's released. Friction = 0. the objekt goes through a loop. find the height when the object loses contact with the loop. Homework Equations The Attempt at a Solution 1/2kx2=...

I am having the user enter a bunch of strings and when the user wants to stop entering them I want him to use control z to stop the input. The only problem is I can't seem to figure how to make that happen, does anyone have any suggestions?

Bill Alsept started a thread raising the general question---do cosmic models with regularly repeating big bangs conflict with thermodynamics' 2nd Law? (The law to the effect that, where it can be defined, entropy does not decrease, or does so only by rare accident, at irregular intervals if at...

..so, we have been assigned a homework to print a certain ASCII art using only loops and methods. We can also use the built-in math methods such as the exponential one and whatnot. Basically, we have been asked to print an increasing loop that goes as follows: * ***...

i know that it is possible to have multiple conditions in a for loop. but is it separated by a comma or would it be separated by && like in an if statement? Thanks

Hi all Well I tried googling this but could not find a satisfactory answer , so here I am seeking help from all you experts :biggrin: So my question is regarding inductive loop sensors used on the road to give presence, vehicle classification etc information. These inductive loops are...

Homework Statement A 1500-kg roller coaster car starts from rest at a height H=23.0m above the bottom of a 15.0-m-diameter loop. If friction is negligible, determine the downward force of the rails on the car when the upside-down car is at the top of the loop.Homework Equations Conservation of...

Homework Statement The normal force equals the magnitude of the gravitational force as a roller coaster car crosses the top of a 46m--diameter loop-the-loop. Homework Equations What is the car's speed at the top? The Attempt at a Solution the answer is in m/s I have several...

I'm supposed to find the currents flowing through the circuit. While loop analysis is pretty easy, converting a bunch of complex numbers back and forth can get complicated fast. I'm not asking for the exact answer, but please look through the solution to verify if my working is correct. Many thanks.

There are still unsettled questions in loop quantum gravity, especially regarding uniqueness of the Hamiltonian constraint, constraint algebra, on-shell vs. off-shell closure, operator norm and convergence, ultra-locality, possibly quantization anomalies. These questions have been asked in...

Homework Statement http://i.imgur.com/pVIMw.png" Homework Equations The Attempt at a Solution I called the top left loop i1, the top right loop i2, the bottom right loop i3, and the bottom left loop i4. I have all of these currents going clockwise in my work. An attempt to do loop analysis...

Homework Statement Two small identical circular loops carrying equal currents are placed with the geometrical axis perpendicular to each other. Find the magnitude and direction at a point O at an equal distance x from their centers. Homework Equations Magnetic field of a current carrying...

For loop in Matlab I have written following code in MATLAB but the if condition inside the for loop isn't working properly. Can anyone tell what's the possible bug?? f=1000; T=0.001; g=0:0.00005:5; w=2*f*T*pi; s=sin(g*w); plot(g,s); grid on; title('SINE FN'); xlabel(' x10^-3 TIME...

Hello, i appreciate your help! 1. Homework Statement In this website the drawing of the situation in the first exercise can be seen, for better understanding. http://wwwprof.uniandes.edu.co/~gtel...s-semana10.pdf The problem asks me to determine the minimum height h to allow an...

Hello, i appreciate your help! Homework Statement In this website the drawing of the situation in the first exercise can be seen, for better understanding. http://wwwprof.uniandes.edu.co/~gtellez/fisica1/ejercicios-semana10.pdf The problem asks me to determine the minimum height h to allow...

Can loop quantum gravity tell us something about the recent phenomena of the neutrinos?

Homework Statement http://i.imgur.com/pVIMw.png Homework Equations KVL The Attempt at a Solution I called the top left loop i1, the top right loop i2, the bottom right loop i3, and the bottom left loop i4. I have all of these currents going clockwise in my work. An attempt to do loop...

Homework Statement http://i.imgur.com/H20el.png Homework Equations KVL The Attempt at a Solution When I solved the equation for V0, I got V0=2V. Is this correct? If it's not, I'll upload my work. Thanks!

If I want to plot multiple iterations of a while loop on one plot, how can I do that? Every time I use "hold on", it just distorts the original line after every iteration instead of drawing independent lines. Please help

Homework Statement Write a script using a while loop that calculates the number of years it will take your bank account to accumulate at least $100,000 if you begin with s number of dollars, and you add that same amount at the end of each year. In addition, your account pays a percentage of...

Homework Statement Homework Equations The Attempt at a Solution If we were to call the bottom right loop I1, the top loop I2, and the bottom right loop I3. I got the following: I1 = 1mA I2 = 6mA I3 = 2mA Which gives me a final answer of I0 = -1mA. Is this correct?

1. Construct a function f (x) so that Newton's method gets 'hanging' in an infinite cycle xn = (-1)n x0 , no matter how the start value x0 is chosen. 2. Homework Equations : xn+1 = xn - f(xn) / f'(xn) The Attempt at a Solution xn+1 = xn - f(xn) / f'(xn) = (-1)n+1x0 = (-1)nx0 -...

Homework Statement Designers of electrical circuits often take the maximum amplitude of the radiated electric field (at a large distance r) produced by an alternating current I0 flowing in a loop of area A cm2 to be given by E=\frac{2.6AI0f2}{r}\muVm-1 where f is the frequency in MHz...

I'm searching for research groups of quantum loop gravity, Does anyone can help me to find at least one of them?. I want to do my PhD on that topic and I have found kind of hard to find those groups and I am looking for a good supervisor, any reference would be very very helpful. Thanks...

Homework Statement A mass m = 71 kg slides on a frictionless track that has a drop, followed by a loop-the-loop with radius R = 16.1 m and finally a flat straight section at the same height as the center of the loop (16.1 m off the ground). Since the mass would not make it around the loop if...

Feedback loops can be very cheap and can be modified easily by things to produce some interesting photos. I used the attached setup to capture these images over 12 years ago and they are accurate to what you actually see on the screen within the maxed out limits of the hardware/software...

I don't understand why always we use open loop transfer function G(s)H(s) to draw the root locus. can somebody please clarify my doubt. Thanks in advance.

Homework Statement The circuit in the figure is composed of two batteries (ε1 = 8 V and ε2 = 5 V) and four resistors (R1 = 110 Ω, R2 = 40 Ω, R3 = 50 Ω, and R4 = 50 Ω) as shown. Image: See Attachment OR: https://smart.physics.illinois.edu/images/phys102/Homework/03/cir06.gif Homework...

http://arxiv.org/abs/1109.1290 [B]Linking covariant and canonical LQG: new solutions to the Euclidean Scalar Constraint[/B Authors: Emanuele Alesci, Thomas Thiemann, Antonia Zipfel (Submitted on 6 Sep 2011) Abstract: It is often emphasized that spin-foam models could realize a projection on...

Can some1 kindly help me understand the following code, I am trying to translate the following code in VBA: Thanks in advance FFLC = FLC ...i understand this part ANGLE=PI/6 !Suppose 30 Degrees ...i understand this part Do 21800 I=i,5 ...Don't understand this FLC=FFLC-COS(ANGLE)*NDIA...

This may seem like a naive question to some people. I had always heard that Lqg can easily incorporate supersymmetry---that if there were any evidence of it, putting it into the theory would be straightforward. This goes way back, to papers I read in 2003-2005. Not sure exactly which, but it...

Hello Everyone I am currently studying the inductive loop detectors used in the traffic control department. I believe the data from the detectors is highly unreliable and noisy. A lot of research has been going on on the 'Fault detecting algorithm' and other means to improve the accuracy of...

If spacetime is composed of tiny quantum "grains," the gamma-ray photons' polarization should change from random polarization (at the GRB source) to biased toward a certain polarization when received by the Integral spacecraft . The Integral polarization results depend on spacetime being...

Homework Statement The attachment shows the problem. The normal force at the top of the loop is 3 g's (as in g-force). Homework Equations PE = mgh KE = .5mv2 Fc = \frac{mv2}{r} PE + KE = PE' + KE' v = \sqrt{2gh} The Attempt at a Solution The normal force would be: 30 * mass...

Homework Statement Revered members, please see my attachment (1) In this diagram, PQRS is a rectangular current loop and I is the current and its direction is shown in red arrow . B is the magnetic field and it acts from left to right and n is the normal drawn to the plane of the loop...

Noticed something interesting about my microphone today and can't stop thinking about it. So there's always been this humming noise with my microphone (I can clearly hear it since I am using headphones), but I've never really thought about it. Now suddenly today my foot touched the metal casing...

Homework Statement Find magnetic field along the z-axis of a circular loop, radius R with constant current lying in the z=0 plane. Homework Equations vec(r) = vector of r. zhat = unit vector z. The Attempt at a Solution So starting with the definition, B = (u_o I/4pi) (dl x...

"Loop variables for string theory" That is the title of a http://arxiv.org/abs/hep-th/0207098" . I know quite a few people have wondered what string theory would look like in the framework of loop quantum gravity. Well, this is a glimpse of how it would be. Only a glimpse, because no-one...

As far as I understand the tree level diagrams of the quantum action in QFT give the complete set of diagrams for a give process. Do the loop diagrams of the quantum action have any physical significance? I thought maybe that by summing up all the diagrams in the quantum action might take us...

Homework Statement I have just done a lab with a refrigeration loop, and I'm unsure of which pressures correspond to which parts of the loop. The hand out says to assume the pressure across the condenser and evaporator are constant, and to use the two pressure guages to measure the pressure...

Hi all, I have discretized my equations in a way that for example the velocity depends on the velocity of the previous neighboring element so: h = number of elements t = 0: 0.5 : 10 for j= 1 : length(t) for i = 2: h v(i,j) = v(i-1,j) + b p(i,j) = p(i,j) +b end end This is not my...

Homework Statement A small loop of wire of radius 1.5 cm is placed at the center of a wire loop with radius 20 cm. The planes of the loops are perpendicular to each other, and a 5.0 -A current flows in each. Estimate the magnitude of the torque the large loop exerts on the smaller one...

Homework Statement A rectangular loop wire is placed next to a straight wire, as shown in the figure. There is a current of 3.5 A in both wire. Figure: http://www.flickr.com/photos/65980314@N06/6020832477/ Homework Equations F = ((mu(0)*I1*I2) / (2*pi*r)) * L force in terms of...

I have a 5000x1 vector and am trying to write a function to calculate an answer for entry 1-11, then 12-22, then 23-33, etc. ... I've been trying to use a 'for' loop, basically: for i = (??) x=i+1 end Not sure what to put in the ? area. I want it to spit out answers for each set of...

Sorry if this has already been discussed, i couldn't find any thing.arXiv:1108.0893 (cross-list from gr-qc) [pdf, ps, other] Loop Quantum Cosmology: A Status Report Abhay Ashtekar, Parampreet Singh Comments: 136 pages, 15 figures Subjects: General Relativity and Quantum Cosmology...

Homework Statement Given a circular wire with radius R. Choose the origin in the center of the circle, the z-axis perpendicular to the circle. One halve of the circle contains a positive line charge \lambda, the other halve a negative line charge of the same magnitude. (a) Sketch the electric...

Considering the ADF (automatic direction finding) of an aircraft. Assuming the transmitting aerial is vertically polarised i.e mag field lies in the horizontal plane. And it is the magnetic field of the incoming signal that induces current in the loop. And what would be the rotating plane of...