Data Definition and 998 Threads

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...

I think you may be interested in the Wolfram Demonstration, "Using Sampled Data to Estimate Derivatives, Integrals, and Interpolated Values"

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...

hi folks, the last couple of times I've been on here have been extraordinarily useful, and i have a new challenge that I'm stuck on so thought i'd ask. this one takes a bit of explaining, apologies. i've encountered an issue with a standard cryptographic algorithm. take a block of data (say...

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(°)...

I wrote this small Excel macro to gather data from vehicles database: Sub ImportCarQueryDB() Call JSON2Excel("2,3,4,8,12,14,20,21,26,27,28,29,31,32,33") ' Specify which fields to extract/import End Sub Sub JSON2Excel(ByVal fields As String) Filename$ = "C:\temp\fiat2.txt"...

Homework Statement I have to do a final project for my Astrophysics class. We're supposed to gather data on the XZ Tauri stars and compare that data to our sun's. I'm having trouble finding data on the XZ Tauri system. Any suggestions? Thank you!

I'm looking for a little crowd-sourced shepherding along the road to a more robust grasp of analytical methods for data munging and summarizing. I completed a BA in mathematics but focused on the pure thread, to the degree undergraduates can be said to focus on anyone vein. I was not a...

Hi. My name is abi. I was wondering if anyone knew how to remove pupil ghost from images using the rmpupil command in IRAF.

Hello, I am working in an experiment proposal for a contest at CERN, and I need reliable data about the Polar Aurora. The experiment consist in using a T9 beam to produce radiation similar to the Sun's radiation and irradiate with it a capsule with gas in conditions as close as possible to...

The data points of the polarization of the CMB are a magnitude and an orientation that varies between 0° and 180°. What kind of mathematical field is that, not quite a vector field? Thanks for any help!

Hey everyone, Firstly, I apologize if there is a more suitable forum. I think this would be considered a calculus problem, but I'm not sure. I'm trying to develop a RF loss calculator for work that can calculate RF loss over a given length of cable or through a passive device at a given...

Can someone give me a link where I can find data on the size of an H atom (free and in main compounds like water)? If there is none can you tell me roughly the range of sizes or at least what is the ratio between a free atom and a bound atom. I know that for a free atom the radius is not the...

Homework Statement The data contains 2500 integers, each is either a 0, 1 or 2: zeroes: 1240 ones: 1014 two's: 246 Does the data follow Poisson, geometric, binomial or negative-binomial distribution? Homework Equations The Attempt at a Solution The mean of the data is...

I'm getting pretty lost with how initial data works in general relativity. Assuming the energy momentum tensor is known (coupled with the metric somehow), what is initial data required to determine the metric at all later times?

Fortran Error "Unexpected data declaration statement" Hi all, I'm writing a program to perform a linear inversion on a set of magnetic data. I'm fairly new to Fortran, but I have coded Fourier and wavelet transformation programs in it. I'm having a problem when trying to declare my variable...

hello frnz i m aiming to provide a compensation scheme for electrical arc furnance but i don't have practical data to deal with.Is there anyone who could provide me rating of electric arc furnace (KVA rating n power factor).

I've been asked to fit the histogram with a Poisson distribution as part of a mostly independent learning thing. The data was produced through a stochastic simulation. Can someone get me started on how I would go about finding the expected distribution? If you need additional information...

Greetings, I have never worked with any good data visualization tools, but it is a skill I would very much like to learn. Does anyone know of some good free data visualization software? If so, could you please describe it a little bit as well? Eg., is it code-based or drag-and-drop...

I want to use the ray tracing software ZEMAX to calculate reflection and absorption using thin metal oxide coatings on for example plastic materials. For this I need is the real and imaginary part of the refractive index in the wavelength region 1-10 micrometer for the metal oxides ZnO, ITO...

Homework Statement If f(x) is differentiable function satisfying 6x \displaystyle \int_0^1 f(tx)dt = 2x^3-3x^2+6x+5 then select correct options(more than one may be correct) a)f(x) is symmetric about x=1 b)f(x)=0 has no real roots c)f(-x)=f(x+1) for all x in R d) f(x)=1/2 has 2 real and...

I have been wondering lately, is the field of Data Science/Big Data used in the field of Aerodynamics? I know that Data Science has found great uses in areas like bioinformatics, finance, social media and sports. I am asking because the two fields I have grown interest in them. If you work in...

I am trying to come up with a good data-rate formula for a system. The system sends out 'x' symbols per transaction. The transactions take place sequentially, but there is a delay 'z' between them. 'z' is variable and can even be pseudo-random. Also each transaction takes a time as well, but...

llo, I am looking for some good reliable data of radial and axial velocities of an impinging jet on a perpendicular plate for Reynolds number of between 10,000 and 60,000. I am about to conduct my own experiment using an LDA to measure velocities but am looking for some good data to compare...

I gathered some data on kids who were screened for a disorder using two screening tools. Each child was screened using both tools. I wanted to see if one tool referred more kids for further testing than the other. I need to determine if there is a significant difference between the number of...