Data Definition and 998 Threads

Hello friends, how are you ? Today's question is: How do i choose the data i want to extract from a file in c++ ? I have this data file in columns format, something like: x y z 1 2 3 4 5 6 7 8 9 I know there is the command file.getline() , and this...

I'm attempting to reclaim lost knowledge... hopefully this works. I would like to take a data set I have x,y values and project the trend beyond the (10) values I currently have. For example, I have a graph with (10) values for x and y, but would like to graph the trend created by values 1-10 to...

I am trying to measure and record the change in peak to peak voltage (measured by a hydrophone) for the following experimental set-up: As you can see the waveform in the vessel changes with vertical location, therefore I have a hydrophone connected to a motor that can adjust its position. The...

Hi all, I have recently done my first experiment in fluid mechanics, and it was a gravity current experiment using UDVP. I have augmented the data, as to remove noise, and performed the statistical analysis. I have text files which contain the velocities measured by each sensor over the time...

Does anyone know how I could convert data from Planck, which appear as an oval shape, into a form that I can easily map onto a sphere (ie. a rectangular shape in 2:1 aspect ratio)? Here is an example Planck image: http://sci.esa.int/science-e-media/img/61/Planck_CMB_Mollweide_4k.jpg I see that...

My quantum physics professor this semester showed us a useful book he had with tables of integrals, etc. in it called "Tables of Integrals and Other Mathematical Data" (4th edition) by Herbert Bristol Dwight. I have been considering buying this book from Amazon but was waiting because today was...

Hi folks, I purchased two books on electric transport at the nanoscale and unfortunately I just found theoretical models and formalism... but the actual data from the experiments was not there. So I am curious about it, I am looking for information on nanowires, quantum dots etc and I would...

Really odd question for you guys but I'm curious about your input, and apologies if it's a foolish question to ask anyway(I'm a CS student and this came up in a discussion with a classmate of mine). So I know this is a fairly odd thought and not likely practical in any real world scenario, but...

hi all, i just want you to tell me if my ideas are correct or not : As far as i can see the R^2 test is usually used in OLS (ordinary least squares) method where many conditions for data is showed (something like linearity in coefficients, expectation values for perturbations must be zero, and...

Hi I've collected few sets of data and obtained significant different linear regression (R^2) in 2 particular sets of data . Does that indicates the 2 sets of data is not validated which might due to data collection error? For example, 20 sets of data contain linear regression of 0.900+...

Can anyone in the cosmology community direct me to hard research data that specifically demonstrates: there is no detectable redshift difference in stars that are the same distance from the Earth but in all different directions. This is of course related to 'does the universe have a preferred...

Is there any method to extract data from a graph in JPEG/TIFF format, using simple software such as MATLAB? I have a graph as shown below: I only have this picture but no raw data and I want to plot the black curve in this graph. How to get approximate numerical data of the x and y axis...

The observation model will be ##z=H\theta+v##, where ##z## is column vector containing the results, ##H## is the observation matrix, ##\theta## is the parameter vector and ##v## is a vector containing random additive noise. b.) In this case ##z##=[1 1 0; 1 0 1; 0 1 1; 1 1 1]*[##m_1## ##m_2##...

I am curious as to the components of FDRs that allow them to sustain such g-forces and immense heat. Surely it's not just a steel box filled with paraffin wax. What alloys are used? what shapes are used in internal construction to prevent crushing/penetration? What do they insulate with and how...

Dear friends, I am unable to solve the following problem. Will appreciate your help here. Thanks in advance. The Purple Mobile Phone Company offers the following two pricing plans to customers. Plan A costs \$15/month, with calls at 25c/minute, while Plan B costs \$100/month with calls at...

Hello! I need to fold some data points to a period, but I am not sure what does that mean. Some help please.

Homework Statement I was trying to fit experimental data which are theoretically modeled by an exponential function. They are shown in the first graph below. For the first set (red line), the data does not appear to be exponential. My lecturer once said that I need to flip the signs of the...

So I've been given this practice problem for a test tomorrow and have no clue how to do it. Info: Students Perform a lab and record data on how changes in mass affect acceleration "Derive an equation that you graph to make a linear relationship from the recorded data." Given is a data table...

How do clinicians determine the appropriate drug dose based on pharmacokinetic data? I was reading up on a Phase 1 clinical trial study for a chemo drug and was wondering how do clinicians and doctors come up with the drug dose based on these studies. Do they make use of the pharmacokinetic data...

While using a piece of jewelry ie a fine chain hanging against a piece of graph paper then placing an origin, axes and scale on the paper I collected the position of the chain as a set of coordinates (x,y). Entering the data into curve fitting software a perfect fit for a polynomial degree 2...

The RAVE project site: https://www.rave-survey.org/project/ In the above image taken from one of the RAVE DR5 video, surveyed stars are shown in 3D and color coded according to their positive or negative radial velocity relative to the Sun. I'm a bit puzzled that stars on one 'side' tend to...

Massive web attack hits security blogger (BBC.com)

Homework Statement First question on PDF: http://ars-chemia.net/Classes/102/Problem_Sets/Practice%20Exam%20for%20Exam%201%20Key.pdf Homework Equations I used the initial rates method: Rate2/Rate1=k2*[A]^m/k1*[A]^m The Attempt at a Solution When I solve these types of problems with the...

In C++ we have 2 types of data structures :- 1)simple data structure so array and structure come in simple data structure group 2)compound data structure so stack,queue,link list,tree come in compound data structure group. In Indian board CBSE data structure linked list is not included it is...

Hi PF! I have some data (y-value data and x-value data) which I can plot to make a curve (see attachment, the top curve). However, when trying to compute the slope of this data I have an issue (see attachment, the bottom "curve"). The formula I am using for slope is ##(y_{i+1}-y_{i-1})/(2...

Homework Statement Hi, we investigated how the length of a pendulum affects the time period of oscillation. We collected data by changing the length (l) of the pendulum and measuring the time period (T). We then squared the T value before plotting it on the y-axis and on the x-axis we just...

Hi All, I am a beginner in embedded world. Currently I am working on MPU9250 motion sensor. My objective of project is to calculate the distance in real time using accelerometer. e.g. If I am at point A (i.e located at 5cm on X-axis) and I am willing to move towards point B (i.e. located at 50cm...

I'm a first-year undergraduate student in mathematics and physics. In my Chemistry Lab class we've recently completed a graphical representation of data assignment and it was interesting. My question is, what can I do in regards to mathematics and physics, or something interesting in general...

Hi. I read that every kink in a data wire reduces throughput. What's the physical reason for this? Does the resistance of the wire increase at a kink or is this an inductive effect or something else?

Homework Statement In this problem we will be generating and analyzing lists of normally distributed random numbers. The distribution we are sampling has true mean 0 and standard deviation 1. If we sample this distribution N=5 times, what do we expect the mean to be? How about the standard...

How do we check consistency of measured data, e.g. x1 = 1 ± 0.1 x2 = 1.4 ± 0.3 I can do this for two different samples to check for significance in terms of different means, but how to check internal consistency of a single set. How can we do this using: a) standard normal probability table...

If an insurer were to offer a policy against data loss from a catastrophic event such as an electromagnetic pulse, the insurer would be in no position to pay when the contingency occurs, the reason being that all of his own bank account will have been wiped clean by the same EMP. Therefore I...

Hi ! I'm not sure to post my question in a good place so please move if inappropriate... I search experimental data of bremsstrahlung interaction as we can found experimental data of nuclear interaction on EXFOR. Someone know a website which provide that ? Thanks in advance !

Homework Statement Given connected, directed and weighted (positive weights) graph. Find the shortest cyclic path for each vertex. Cycles have back edges and can also be self loops. 2. The attempt at a solution I need some clarifications for this problem related to implementation in C. After...

Hi there! Does anyone know where data from the GPS is available? Any data at all - positions. clock readings anything like that. Many thanks!

I have this really noisy data and I'm wanting to plot Temperature v. Time. I used this function to calculate a moving average. Here's some sample code. BA1='ANP-Heat-BA1.csv' #Time Trial 1 time1=pd.read_csv(BA1,skiprows=0) time1=time1['Time(s)'] #Temperature tmp1=pd.read_csv(BA1,skiprows=0)...

Hi there, I'm trying to model how much faster we will be able to pull data from a set of controllers. I know how long it takes to read a single data point from each controller. Right now we are reading each and every data point. The change I would like to model is some of the data isn't read...

Hello all, Where can I find post stall airfoil data? I'm writing a numerical methods program and need lift coefficient data for airfoils at very high angles of attack. Books or websites would be great. Thank you for any help

Hi, so currently I am stuck in a situation where I currently accepted a job offer and had 5 other interviews which I never heard back from any yet. (I will have to say no if I hear back I guess and there was one I really was hoping to get but its going to be too late now). These were for data...

The company I work for makes and repairs circular saw blades. When we receive blades in from companies, they must be checked into our system manually using an ID number, and we are looking for a way to check them in by scanning, like a data matrix. We have sent out several blades to companies...

according to blogger Tommaso Dorigo the LHC "What to expect for ICHEP I believe that if the machine keeps delivering at this pace, by mid-July CMS and ATLAS could have in their hands some 10 inverse femtobarns of 13-TeV collisions. Those data, three to four times larger in size that what was...

I have two data sets A and B which correspond to two different settings of the system. Both sets contain 5 separate lists of integers; I took 5 samples, at different points in time and location, for each set to reduce the random error in the data. How would I go about comparing sets A and B? If...

Hello I have a set of data points, with errors (X1 , Y1 +- deltaY1) , (X2 , Y2 +-deltaY2) etc I have the covariance matrix for these bins I want to integrate this set of data points: SUM_i ( Y_i * X_binWidth_i ) How do I combine the errors, taking into consideretation the...

Hi everyone. I am totally new to statistics so my question may or may not be simple! I know that for the data fitting we can do a chi squared test like: \begin{equation} \chi^2 = \Sigma \frac{(f_{data}-f_{model})^2}{(error_{data})^2}\end{equation} So I have been doing this for a while, but now...

I am currently creating a database of all the known cosmological objects, and need to know the percentage error in the following data: Diameter of the sun: 1.3914x108 metres Mass of sun: 1.989x1030 kilograms I have the orbital period of the sun to be: 2.75x107± 9.1% years

Hi, Here is a typical data sheet for a commonly used 6l6GC tube. http://www.drtube.com/datasheets/6l6gc-jj2003.pdf Under typical characteristics (in this data sheet) a value of Ra and Ra-a are given. I assume Ra-a means Za-a and it could also be written as Zout. Is this a correct assumption...

Homework Statement I have some registration of sound gathered by hydrophone. Next I have created a power spectral density (dB re 1 Pa^2/Hz) vs frequency plot (semilog in matlab). And now I want to find spectral slope in dB/octave (one octave is log2(f2/f1). I suppose that I should calculate the...

Homework Statement I'm a little lost on how to plot this data and function. I included the homework question and my attempt at plotting in the attached picture. I'm pretty sure what I have is completely wrong and I honestly don't have much of an understanding of matlab, so the more you dumb it...

Hello everyone help please I need to fit experimental data with a theoretical model using the MATLAB software what is the best way to do it? thx for advance

Hi, I have a simple/fast question... Can you reliably use a Poisson function to fit on data that seem to be Gaussian distributed (although that is due to the large number of the mean)?