Data Definition and 998 Threads

Galaxies that are further than c/H metres from us, have recessional velocity exceeding c and thus they begin to fade away. Is there any data for how long it takes galaxies to fade away from the perspective of an observer on Earth where when t is zero, the recessional velocity of the galaxy is...

Hi i have an interest in gravity, space, and general developments. Background in in Telecoms and IT to management level. I Operate out of own business providing information solutions of various kinds from data collection, processing to visualisation. I always had an interest in electronics as a...

Does anyone know of galactic rotation data (any galaxy) of the following form: For simplicity assume an [x y z] coordinate system with the origin in the center of the galaxy and [x y] representing the plane of rotation. At any point [x y z] there is a corresponding velocity vector [vx vy vz]...

Hello everybody, I am currently working on a research project and need to record the IV curve of a plasma discharge. Our current setup is pretty cool. We just have a web camera setup and using python+OpenCV we make meter reading inferences based off true/false statements based around what...

I have some time series data of the absorbance of Br2 formation using UV Vis spectroscopy and I need to figure out the extinction coefficient/ absorptivity. The overall reaction is BrO3-+5Br- +6H+-->3Br2+3H2O which is expcted to go to completion I know that the equation relating absorbance to...

Homework Statement Given a matrix n x m with unsigned char data type entries (entries are of size 1 byte, so data type of an entry should be unsigned or signed char, not int or char *). Entries are read in hexadecimal format (0x00,0x11,0xFF,...). Matrix should be allocated dynamically. Print...

Hi all, I have algorithm to analyze and make it easier to implement in programming language (Python). We have table with data and we want to select only representative part. It looks like: ID_PRODUCT | CARDINALITY | SET VARIANCE WITH THIS ELEMENT AND ABOVE 10 ---------------- 110...

Hello! I am wondering if it is theoretically possible to allow a means of data transfer (or internet, etc.) by the idea of quantum entanglement. Correct me if I make any errors in understanding. But, by what I understand, in essence you could for instance run a computation on a quantum computer...

Hello! I am yet very weak in statistics, but I am learning some basic finance, and this requires to create regression. Please, take a look at attached files - one excel that contains the results of regression and one screen shot of the window of StatPlus that I have to fill in. Before using my...

Hi, am working on a vehicle tracking device, i am using LIS3Dh accelerometer to get the acceleration data. i am using TM4c1231e6pz controller. I need to implement a harsh breaking alert, I am having difficulty in finding out which direction the vehicle is moving since the axis are not aligned...

hi I have a random set of time series data that is calculated after applying an algorithm to a main random time serie data, and really need to extract all the possible characteristics from the set. The goal is to measure those characteristics and perform some statistical graphs based on those...

Hi PF! I used NDSolve to find the solution to a differential equation. I then plotted the solution in mathematica. However, I would like to be able to plot this in LaTex, specifically in TikZ. Can anyone help me here? Thanks so much!

Homework Statement The function h(t) = 5 sin (30(t+3)) is used to model the height of tides. On a different day, the maximum height is the minimum height is -8 and high tide occurs at 5:30am. Modify function so it matches new data. Homework EquationsThe Attempt at a Solution Answer: h(t) = 8...

I want to try to predict the USA summer highs using a linear regression. I know I can probably take data from the last 10 summers and plug that in, and use that to predict, but I'd like to use two data sources. 1 data source from the historical highs from past summers in the USA, and the 2nd...

Homework Statement The height, h, in metres, of the tide in a given location on a given day at t hours after midnight can be modeled using the sinusoidal function h(t)= 5 sin 30 (t-5) + 7 (A) find max and min value for depth of water. (B) what time is high tide? What time is low tide? (C) what...

Hi everyone, I am an undergrad student of psychology and I was curious is anyone from you would be interested to cooperate with me to discuss possibility about device which would help psychologists monitor data about patients. From what I know we can measure breath, pulse and even temperature...

So I did an experiment a this week on the relationship between two tightly wrapped coils with same length and number of coils in a transformer. This was in a compete circuit using AC currents. I measured the Voltage, keeping the currents the same. One experiment had an iron core between the two...

Ok, who has a spare super computer? http://cms.web.cern.ch/news/cms-releases-new-batch-research-data-lhc What is there motivation for this and realistically what can come from it?

Data collection can begin! This night the luminosity ("collision rate") was negligible (0.05% of the design value), but it should go up quickly as more and more bunches are filled in for the runs. By August we might know if the diphoton excess is something real or just an extremely weird...

My experience with data fitting is poor so I am in real need for help. The potential in the following is periodic over [0,Pi] I need to find a fitting function that I can use to perform further mathematics. Fourier series does not work, but a 40-degree polynomial give the following fit...

I am not sure this is the right forum for this -- I have a question about a particular paper: http://www-users.cs.umn.edu/~sboriah/PDFs/ChandolaCBK2009.pdf The authors describe 4 heuristics that can be derived from categorical data -- this is in order to map categorical data to numerical...

i know that a node cannot have more than one parent given that these parents have common ancestor (because this is undirected cycle and a tree must have no cycles). but can a node have more than one parent given that these parents don't have common ancestor (which will produce an unrooted tree i...

Hello Physics Forums, After about one year of research and construction, I have nearly finished building a functioning inertial electrostatic confinement fusion reactor. Just to be clear, I do not wish to discuss the dangerous activities that are involved with my project as I know such topics...

I'm doing an experiment at work where I am observing an "event" over time. This event can be anything, but let's assume its a bucket of water being filled to the top, then it gets replaced with another bucket and I watch the whole "event" again. So x-axis will be time, y-axis will be the volume...

Hi! I have to fit a blackbody spectrum to some data points. The y-axis is in mJy and the x-axis is in log_10(freq). My code looks like this: from __future__ import division import matplotlib.pyplot as plt import numpy as np from scipy.optimize import curve_fit h = 6.63*10**(-34) c =...

Dear all, I am looking for observational data for the number count of galaxy mass function: \begin{equation} dn/dM\end{equation} in terms of redshift and also mass, to compare with theories. I know that I can use HIPASS data (most probably), but as I am new to the field, I have to idea: 1-...

Homework Statement Hello guys, I have a set of data containing x and y coordinates(width and length) as well as a 'z' coordinate that represents power density at each point of x and y given. I was hoping that someone might be able to help me figure out a way that I can find a function for z in...

Homework Statement I'm being asked to compare the standard deviation of a data set with the root mean square error of the regression line used to model the data, in order to determine the reliability of the regression line. Homework Equations Mean squared error = variance + bias squared The...

I have a data set of number of counts vs position where counts were detected. I want to find the noise in the sample. Am I right to think that by 'noise' the requestor wants to know the standard error (SE = stdev/sqrt(N)) where N is the sum of x-axis points. Also if the above it true then is the...

Homework Statement Hello! So, I recently did an experiment where I altered the eccentricity and distance from the sun of a planet orbiting around the Sun in a simulation and measured how long it took the planet to complete a single orbit. With this data, I compared my experimental data with the...

Homework Statement The problem includes a graph. All I have is a current to external resistance graph, with 20 A coming at 10R of external resistance. I am to find the EMF and internal resistance of the battery. Here is the problem and my two attempts. http://1drv.ms/1LKbu5H Homework...

Hi everyone, I'm current working on a project about special relativity, and i was thinking writing about the cosmic ray muons. But where do i, as a high school student get raw data of cosmic ray muons? I have searched quite a bit, but it doesn't seems like data like that is public and easy...

Hi All, Just curious: what kind of data types does one usually use for web addresses, for phone numbers? EDIT: I am using MSSQL 2014 . Thanks.

Consider this form: ##A = \int B\left(x\right) C\left(x\right) dx## I have the values for ##A## and ##C\left(x\right)## (a value of ##C## per value of ##x##), is there a way that I can extract ##B\left(x\right)## numerically or analytically? Thank you in advance.

Hi, so I have the spatial distributions of detected hits in figure 1. When plotting fig 1 as a regular scatter plot I thought I could discern some sort of pattern. So I got the idea of taking its Fourier transform and to see the result of the analysis. I am not very well acquainted with the...

Assume the following set of instructions: 1. i = 0 2. if i < n, goto line 6 3. if A [ i ] = = x, goto line 7 4. i++ 5. goto line 2 6. return false 7. return true Assume that line i take Ci time, where Ci is a constant. The worst case total time of running this block of code can be calculated...

https://losc.ligo.org/events/GW150914/']The[/PLAIN] LIGO Open Science Center has released data from the gravitational wave detection along with a tutorial going through some typical signal processing tasks on strain time-series data associated with it. GW150914 Data Release From the tutorial...

Dear Group, I have a 30_sec_data.txt with weird characters in it and data.txt with nice numeric in it, Any one have any ideal to help me convert data from weird to regular data using Matlab. Thank you, Best regard,

hello forum, I have read about SONET which seems to be a physical layer protocol to transport data over fiber optics. SONET is a TDM (time division multiplexing method). TDM means that that time divided into slots and shared between different users. For example, given three users A, B and C...

Hi All, I am having trouble seeing how Relational Databases (RDBS) can be used in the world of big data. The inflow of data seems to be way too fast for the database to reflect what is going on at a given moment. I understand this issue is supposed to be addressed by data warehouses. Is...

I need a list of neon visible wavelengths. I wonder if any of you know of any good resources. I've tried searching but sometimes I get too many numbers. I also need to link each number with the spectrum colour chart, but so far I can't find anything like that. cos I don't want just want an...

Hi everybody, I hope some of you have worked with pulsars before or other x-ray data from NASA Heasarc. I need some data showing a very precise light curve of the crab pulsar and some other pulsar. It should be something like this: http://cdn.eso.org/images/screen/eso9948i.jpg Where the time...

Hello, Beginner here so take it easy. I am building a basic hybrid-platform app using Smartface (a similar platform to Phongap). For purposes of this discussion, the app will do something very basic: you click the start button and it will start counting down from 30 minutes to 0, and when you...

Hello Everybody! At this point of my life, I'm facing a dilemma which might seem a bit unconventional, or even strange: Should I apply to Data Science Master's programs or Physics Master's programs? I'm in a state of constant confusion and can't make my mind to pick one of these paths. Any...

1) For standard non-linear least squares, the standard approaches are to either a) to use the jacobian to linearize, and proceed with linear regression, or to b) linearize the raw data 2) When data needs to be "fit" to a complicated model (e.g. some non-linear differential equation) that...

Hello.I have 3 repitions of an experiment. The data consists of mass flow rates vs. time. What I want to do is to calculate the mass vs. time, i.e. integrating my data. I consider the resolution for each measurement to be exactly 3 minutes. To calculate the area I use the trapetzoid rule, i.e...

Hey all, pretty easy question. Received a request that we are obligated to uphold regarding our purchasing information. We must provide the information in a concise format (pff). Here's the issue. They are going to use it to sell marketing information and we don't like the idea of them making...

http://arxiv.org/ftp/cs/papers/0701/0701016.pdf The above is link of Kafri's paper I was just studying at high school when I found this theoretical scientific discovery proposed by an enough notable Israeli physicist Oded Kafri. He made a unique unification or link between second law of...

I have an array of n strings (with blank spaces). Data type of an array is char***. How to allocate memory for char*** data type?

Hello everyone! In C language,does two different variables with different data types but equal values equate each other? For example,are these two statements equal: int x=3; float y=3.0; ? thanks in advance..