Data Definition and 998 Threads

Raw data sample source: http://people.isy.liu.se/jalar/belltiming/ 999 detections parsed in .txt format: http://www.mediafire.com/download/1pi64hrydzs7r7h/bell999.zip This below is the first 99 detections. It's unmatched raw data, so A-B pairs on the right are going to be different once the...

Homework Statement I'm trying to make a Nyquist diagram based on experimental data obtained of the gain and phase of a high-pass RC filter which has the transfer function: ##\frac{V_{out}}{V_{in}}=\frac{R}{R+1/(j \omega C)}=\frac{1}{1-j\omega_0/\omega}## Here are the superimposed...

I want to do some prototype work that may need some springs. they are long springs I will need to find cheep part so I may need to know how to make them as well. The end use would be long large and springs and work around 2200 lbs. I can't give to much more then that some people will think its...

Hello, 1) I am looking for numerical data behind plots like this one. 2) Also, any information on the experiments the data comes from would be helpful. Are cone cells directly measured, or does it involve a human matching colors to a pure color light source? 3) Will I be able to write a...

Is there a formula that will give me the equation for the line of best fit of a data set, the line being a 6th degree polynomial? I know how to graph the table and add a line of best fit while showing the equation but as far as I know the equation cannot be used in the given format in excel. If...

Hello, There are three different orders of traversal that we learned about ##\bullet## pre-order traversal ##\bullet## in-order traversal ##\bullet## post-order traversal Anyone know of any easy ways of remembering these 3 and how to order them? I have posted my lecture slides, but I could...

Hi all, I wonder if I study new Higgs scalars, How the data of the LHC for searching for heavier scalars in h-> WW->lvlv and h -> ZZ-> 4 l channels like in [arXiv:1304.0213] can make constrain on my study for the new Higgs? How a figure like figure 2 can give me data for my model...

So, here's the deal: I'm trying to complete the publishing of a paper dealing with my thesis from almost two years ago, and I finally wrote a program that I believe will tell me how different geometries will influence the outcome. Here's the setup, I am modeling the radiation that goes through...

Hello, my problem is the following: A lasers gives out a bunch of data points which are reflected off a metal surface and recorded by a camera attached to the side of the laser. The image the camera receives is however distorted. In order to calibrate the camera I need to find a function...

Hello! :-) I' have a problem... I fitted experimental data with a second order exponential theoretical curve: y = A1*exp(-x/t1)+ A2*exp(-x/t2) + y0 and I have these data for 4 repetitions of the same experiment: first time: Reduced Chi-Sqr = 6,81066E-4 Adj. R-Square = 0,41005...

I have some data from gas emission samples, part of the data was sampled in a region with a characteristic A and elsewhere with characteristic B. However, each region corresponds to a different percentage of total area. I want to calculate the central value (average or median) of unbalanced...

Suppose I have around 20 exposures that potentially affect an outcome and I want to see which exposures have bigger impacts on the outcome. So I want to calculate each exposures' odds ratios by exponentiating the coefficients obtained from logistic regression. So I have the following input set...

I saw this group many years back that I suspect was cherry picking their data. The students would purposefully get as little data as possible. Enough to compare it to a model, but not enough to to negate the head researchers claims. When I would go and do the experiment more thoroughly...

I am a UK iB student who has just finished year 12 (penultimate year) of secondary education. As part of the iB I have to do a 4000 word extended essay and I chose to do it on the coefficient of restitution of a metre ruler (I am aware this is slightly bizarre and unusual but I had reasons...

I have very large data sets: coins & amount i.e. {10 & 11, 9 & 7, 8 & 9, 4 & 5, 3 & 1} graphed would show greater volume to the left side while {1 & 0, 2 & 3, 2 & 1, 4 & 6, 9 & 10} would reflect greater volume on the right, and {1 & 4, 2 & 3, 12 & 10, 4 & 4, 3 & 2} would reflect a surge in the...

hi guys, so I'm trying to save data onto my EEPROM, the problem is it works for a while of data, but not all of it. I'm not sure if its a problem with reading though, or the writing part. Essentially I'm writing an integer value into the EEPROM to obtain later, although I expect to have quite a...

I am currently researching about the behavior of dark matter and their possible characteristics, and I am needing the individual velocities of the bodies orbiting a center of a galaxy. The collection of data where physicists hypothesized the existence of Dark Matter. Where can I find these data...

Swarm Data: Earth's Magnetic Field is Weakening 10 times Faster than Recent Past. Why? http://news.yahoo.com/Earth's-magnetic-field-weakening-10-times-faster-now-121247349.html Swarm is the name of three specialized satellites that were launched by the European space agency in November...

Hi All, I have a problem I've been thinking about for a while, but I haven't come up with a really satisfactory solution: I want to do a discrete Fourier transform on data that has been sampled at 2 different sampling frequencies. I've attached a picture of what my data will look like...

Homework Statement Use a coordinate conversion application to roughly map out the amount of precession in coordinate positions (R.A and Declination) in the sky between 1950 and 2000. Homework Equations I can easily find a converter on the internet The Attempt at a Solution I...

Hi, I've been working on trying to model sales for my work and I'm really just modeling it using exponential regression, so I get the linear regression of the logarithm of the data and obtain the desired formula. What I'm confused about is that if I integrate this to try to predict how many...

Greetings, I am attempting to compute geodesic distances on manifolds where structural data have been sparsely sampled. First, off I am not well versed in the mathematics of differential geometry but I do have some knowledge (from an introductory differential geometry class in my...

Homework Statement Homework Equations The Attempt at a Solution A = [2.1, 4.2, 6.7; 8.3, 5.3, 5.4] A = 2.1000 4.2000 6.7000 8.3000 5.3000 5.4000 [mVal, I] = max(A,[],1) mVal = 8.3000 5.3000 6.7000I = 2 2 1 I don't understand what max(A,[],1) is...

Hi, Reffering to the attached image, I wonder how total power dissipation is defined in each case; "Tamb < 25C" and "Tc < 25C" respectively. I suspect that Tc is referring to usage with a heat-sink , but it makes no sense as the TO92 case is not well suited for heat sinks. Thanks in advance!

Hey all. I'm getting a new hard drive in tomorrow and I was wondering if there was any software that would copy everything from the old hard drive to the new one without having to re-install windows. Any ideas? (Or other methods of keeping all of my current data and settings in windows on a...

Is there a way to reinstall win7 without the disk and without losing all of my data? The only back up I have is a bit old and I can't get my external hard drive to connect. I have a rather bad virus and I can't seem to get rid of it, so I am thinking its best just to reinstall windows.

Homework Statement We set up a spring with a weight and displaced the spring from equilibrium position. Using a recording device and a motion sensor, we found various data that I have put in the attached table. When doing calculations for the lab, we ran into problems, but I simply want to...

I have a byte array of length 16384 bytes obtained from random.org/bytes. There is a random number sequence test program available from http://www.fourmilab.ch/random/ that, when run on my byte array, returns the following: Entropy = 7.989469 bits per byte. Optimum compression would reduce...

Homework Statement http://www.math.ntnu.no/~haakont/grunnkurs/oppg/eksDes11e.pdf Please take the time to read problem 3 ("Oppgave 3) b, to understand what I am talking about. Everything's explained there. The specific part I am curious about: "Define a 90 % confidence interval for...

I have a small intervention study comparing a paper based registry versus an online based registry. In the 36 months of the paper based registry I had 185 participants in the 13 months of the online registry I had 301 participants. The average participants per month in paper was 5.1 and...

Hello everyone, I teach Physics at a local high school. I designed a simple lab to determine the relationship between net work and kinetic energy. The diagram is shown below: In this experiment, students release the cart from rest, while keeping displacement constant. A Vernier motion...

I have some experimental data (not hypothetically, this is real data), which has a downward sloping shape. A sharp decrease initially, before settling to what looks almost like a downward linear slope. To investigate further, I decided to take the base 10 log of the y-axis data. The...

Please look at attached picture. So, I tried solving it. Apparently, the answer is C. But, I think there is missing information (ie the volume of the initial solution). Care to back me up on this?

I have a lot of measurements of some quantity y as a function of x. All these data points are such that no y_i is taken at the same x_i. So I want to fit some kind of function to all these data point, but I want an uncertainty in the y_i's. Normally if I had say 10 y_i measured at the same x_i...

Homework Statement Homework Equations x^2 + y^2 = 9 A = 0.5xy x ≠ y The Attempt at a Solution x^2 + y^2 = 9 A = xy/2 (x + y)^2 = x^2 + 2xy + y^2 = 9 + 2xy = 9 + 4A A = ((x+y)^2 - 9)/4 Then I am lost. I need to find the area.

I am simulating an ODE where the differential function is a function of sampled data points and are having trouble obtaining data in between sampled points (for the step computations of RK4). The first thing that I tried was to linearly interpolate the data, but that introduced large...

Hi, I'm doing a project to see the feasibility of transmuting tungsten into platinum on a small scale (maximum output of 1 kg per month). However, some of the cross section data that I need seems to be hard to find. Now because I am new to this, I don't know if its because no body has...

Data analysis -- Comparing temperature data from multiple sources Dear Peter, I am Engineering student from Japan.I have installed 8 sensors,4 at rural and 4 at urban area.Those sensors measures the temperature and other property in time series format.Now, I am using one month data and...

I'm doing research and I have some data (attached -- 'y' = first column, 'x' = second column in CSV format) that I need to find a general curve fit for (function = f(x)/x). This will help me do future predictions. Here are my stipulations: The fit curve must have the format of f(x)/x. Two...

Hi, I am making an NMEA (GPS) signal tracker. (NMEA data is sent from satellites, funcubes plus many more objects e,g, animal tracking) and will be used to aim it's antenna toward the signal for better reception. I assume that this is used for telescope aiming also. The data includes...

I was wondering if anyone could recommend a source for economic data where I can find a list of countries with where they export oil to, and how much per year. I use Mathematica, but their "CountryData" function doesn't have the functionality to do this.

Hi I have two sets of data, y as a function of x, for two different experiments. Y is the dependant variable, an instrument reading, x is the independant variable, a concentration of something in a solution. Plotting the data in excel gives me 2 curves. The experiments were...

Homework Statement A head on collision between mass and mass B occurs as described in the F vs s graph below. Complete the table in the data section Find \vec{x}A Find \vec{x}B see attached page for clarification Homework Equations P=m*v \DeltaP=F*t Ek=\stackrel{1}{2}mv2 \vec{d} = \vec{v}t...

Dear Experts! I currently have a sets of data with different time interval and I plotted it into MATLAB from excel. Is there a way for me export the files or calculate the mean, standard deviation etc so that I can calculate error etc. It would be great if I could do it in Matlab. I am...

I have several data points with error bars, and these error bars are different sizes for each of the data points. I'd like to fit a model function to them which has non-linear parameters, and be able to get error bars on the model parameters, ie. if my model is something like f(x) = A +...

I have created a contour plot in MATLAB using the following code: >> NP=40; >> [RP TP]=meshgrid(linspace(min(RPM),max(RPM),NP),linspace(min(BMEP),max(BMEP),NP)); >> BSFC_IT=griddata(RPM,BMEP,BSFC,RP,TP); >> NC=12; >> Fig1=figure; >> [CT...

Attaching a data logging system to a voltmeter: Produino ST Master Chip 0.56" LED DC 3-Digital Display Digital Voltmeter- Black (DC 0~100V) Goal: I want to save the data from the voltmeter over time with a ± 10Hz sampling rate, logging this on a SD card or UBS stick, making it able to...

Would it be possible to store Data in a space smaller or equal to the plank length? And also does Data (or the storage of it) take up physical space and if so how much approximately? Thanks, Michael.

Dear Experts! I am currently try to measure the drag of an buoyant object. I did 10 replicates, in general terms 10 tests all with the same set-up and same release mechanisms. To start off with I will explain my project: Drag reduction in swim cap First of all I got one accelerometer...

Hi, i've just installed Healpix on IDL, and I'm starting to try all the subroutines. First of all, i learned how to make a dipole map with random numbers (it works!:) ). Now i'd like to plot a map using real data. The .txt file is organized like this: DEC(°) AR(°)...