Error Definition and 998 Threads

Find the error in the following argument by providing a counterexample. “The reflexive property is redundant in the axioms for an equivalence relation. If x ∼ y, then y ∼ x by the symmetric property. Using the transitive property, we can deduce that x ∼ x.”

Dear all, I am working on Arduino and try to upload to Teensy, but when I uploaded, I had a problem with this message, "Interface22.ino:32:21: fatal error: MCP4725.h: No such file or directory compilation terminated. Error compiling"Could you please help for the reason and how to solve this...

I got and fatal error like below. " fatal error. continue run not yet consistent with histp writing. " Couldn't I use continue run when I make histp file? please, help me... calculation time is too long, so I want to use continue run.

Homework Statement Three charged particles are placed at each of three corners of an equilateral triangle whose sides are of length 2.7 cm . Two of the particles have a negative charge: q1 = -6.0 nC and q2 = -12.0 nC. The remaining particle has a positive charge, q3= 8.0 nC . What is the net...

Homework Statement I have make a program that solves the distance between 2 points on a triangle. Homework Equations none The Attempt at a Solution /* homework 1 */ #include <stdio.h> #include <math.h> int main(void) { // Declare and initialize variables float x1=1, y1=5, x2=4, y2=7...

I'm doing a lab where we use three strings connected to a ring, with each string attached to separate spring scales. What would be sources of error in this? And how does friction affect my results?

When I switched on my laptop yesterday, a window opened automatically with a name : "C:\Windows\system32\Cscript.exe". It now happens every time I restart my laptop. Is this because of some computer virus or should I just ignore it ? (My laptop is 5 years old and runs on Windows 7 ultimate 32...

I have to created a Current Transformer by Ansys Maxwell 15. I set Boundaries, Excitations, Mesh Operations, and Analysis correctly. Finally, I select the menu item View > Set Solution Context, the Set View Context is appeared, and I want set Time to "0s" but it shows only "-1". I don't...

(Sorry if this is the wrong place for this question, I wasn't sure where to put it) I've been running an experiment with rabbits, and am trying to figure out the error of my feed measurement. I fed them using a 1/3 cup measure, and recorded the number of scoops they got. I estimated that the...

I've been working an internship over the summer, and I ran into a very humorous coding error. Everyone at the office got a kick out of it, and I thought some forum members might laugh at it as well: So painful! It was not very funny fixing it though.

Hi, I have a 2 sets (f and y) of 1000 data points each. Also, each data point corresponds to one in the other set. Essentially, I wanted to compute the standard deviation between the two sets, and I did this: ## \sigma_1 = ## IMAGE 1 (check attachment) ## \sigma_2 = ## IMAGE 2 (check...

Sorry if the answer is very simple, but I just had a question regarding error propagation when using a modulo operator in intermediate steps. For example, I have ## \theta = arctan(\frac {A}{B}) ## and then I do ## \theta ## % ##2\pi## (modulo ##2\pi##). This gives me an answer between ##...

Orodruin submitted a new PF Insights post Plus/minus What? How to Interpret Error Bars Continue reading the Original PF Insights Post.

I know its written in greek but i think its a common problem...any ideas? i think that's why the "build 7061" geniunity problem appears. :(

I accept that what I write below will be unpopular and argued with vehemently, however I think it should be considered with an open mind and recognised for the sense that it has. Originally the concept of an expanding universe (and therefore by extrapolation the concept of the Big Bang that...

Hi, I imagined this device and I don't understand where is the error. I posted here because it's a simple mechanical device, I have trouble with the sum of torque. The potential energy must be constant. I think I forgot a torque, if you see where ? A torus turns counterclockwise around the...

Homework Statement So I'm currently modifying an example Symbolic Regression program that uses genetic programming, a type of evolutionary algorithm. I'm using the python deap library. Not sure if anyone on here is familiar with it, but I think that the error is more general to a misuse of...

Homework Statement Hi, with regards to the negative zero error , do we read the vernier scale from the left or from the right? In this case, should it be -0.04cm or -0.06cm? Thank you !

Homework Statement "An instrument (oscilloscope) is prepared to measure a sinusoidal periodic wave, compute the measurement error if the same instrument is used to measure the wave indicated in figure 1 (The wave is much more like a sawtooth wave, sorry for bad drawing)Homework Equations...

I think I found an error in a webassign problem. What do you think?

I really like the book, its the first physics textbook that I liked actually. But I've found a minor error. On page 8 (chapter 1 The Wave Function) it says that if you sum deviations from average of a random variable you'd get zero because " Δj is as often negative as positive", here's the...

I am having an issue with the declared type of the return value of a function not being recognized in its call. This function clearly has its return value declared as complex*16: !----------4-vector dot product under Minkowski metric---------- function dot4(v1,v2) result(res) implicit none...

Hello I have a doubt with the least squares fitting (linear fitting). The low-level statistics textbooks only take into account the statistical error of fitting, but not the error of the fitted points. How is the error of the fitted points taken into account, and included in the total error...

Hi there, I have a quick question to report some numbers on an experiment. I made measurements of fluorescence in a titration of a chemical. The titrations were 1:2 serial dilutions so I report each fluorescence as a function of the log2 concentration: concentration chemical x: 1 , 0.5, 0.25...

How to calculate the permissible error? A force F is applied on a square plate of size L . If the percentage error in determination of L is 2% and that in F is 4% . What will be the permissible error in pressure?

Gurus, can you help please? I've been given a set of samples, each has different sample size and mean (but not individual observations). I'm trying to figure out the population standard deviation so that I can estimate required sample size for certain confidence intervals. My question is how...

Homework Statement Prove: Hint: Group the terms in the error as ##(a_{n+1}+a_{n+2})+(a_{n+3}+a_{n+4})+\cdots## to show that the error has the same sign as ##a_{n+1}##. Then group them as ##a_{n+1}+(a_{n+2}+a_{n+3})+(a_{n+4}+a_{n+5})+\cdots## to show that the error has magnitude less than...

Every time I try to open Intel XDK it comes up with the error message that is attached. It gives instructions on what to do to allow the ports, and I've attached the screen shots of what I've done in control panel- so in firewall, (with the new windows I can't get to the 'exceptions' tab and I...

(Change in momentum is the area under a force against time curve.) (Force is the time derivative of momentum.) Using separation of varibles, you get Fdt=dp. Integrate both sides, you get that the integral of Force with respect to time is equal to p. This seems to imply that p, momentum, is...

You prepare 0.5 liters of a solution by adding 0.75 moles of a weak acid HA to water. For HA, Ka = 10^-1 Finally you dilute this solution to a final volume of 2.0 liters. What is the pH of the diluted solution? My solution is this. [HA] = .75 mol /.5 L = 1.5 M. HA + H2O -> H3O+ + A-. If x...

I had these code in this forum but comes out error as below, any suggestion? Error 1 error C4430: missing type specifier - int assumed. Note: C++ does not support default-int c:\users\username\documents\visual studio 2010\projects\fdm 001\fdm 001\explicit 001.cpp 27 Error 2...

First of all, I am sorry if this is in the wrong subforum; I'm not sure if astrodynamics should be under astronomy. The post is also fairly long. My problem is that in my derivation of the center of mass of a binary system, I get a conflicting result for the distances of the center of mass to...

Is there an error, perhaps typographical, in the famous 1939 Oppenheimer-Snyder paper "On Continued Gravitational Contraction" (Phys Rev v56 Sept 1, 1956 pp 455-459)? Do the units balance in equation 37? The last term inside the last parantheses ##\frac{3r_0^{1/2} \tau}{2R_b^2}## where...

Dear Forum users, I am running a program called NMTO package for constructing Wannier functions for a material. It uses a code plotnmto.f90 to calculate wannier isosurfaces within the mesh defined by me. I compiled the code in gfortran. After defining the mesh when I ran the program for...

kreil submitted a new PF Insights post 5 Common MATLAB Error Messages and How to Fix Them Continue reading the Original PF Insights Post.

Homework Statement The density of a cylinder is calculated from the following data: mass m= (9.1±1.1)g , diameter d = (2.8±0.2) cm , and height H= (4.1±0.6) cm. The error on the density, before rounding, is ( in g /cm3 ) Homework EquationsThe Attempt at a Solution

Note that the code I am using is Python. Currently, I am attempting to numerically solve the equations of state that give rise to the Chandrasekar limit for a white dwarf star. My code works for a simple harmonic oscillator given the correct equations of motion, but does not compute the correct...

Homework Statement It is known that the theoretical resistivity of copper is approximately: 2*10^-8 Ωm. But after I conducted an experiment to find the resistivity of copper, the results turned out to be: 1.68*10^-8Ωm. This is a very small error that can be easily dismissed due to "human...

Homework Statement The circumference of a sphere was measured to be 90 cm with a possible error of 0.5 cm. Use differentials to estimate the maximum error in the calculated volume. Homework Equations Volume of sphere: V=4/3πR3 Circumference of Sphere: C=2πR ΔC = 0.5 cm The Attempt at a...

Homework Statement I am given a frequency value of 95 GHz (9.5x10^10 Hz), C= 25 F, L=1.12x10^(-25) H. The question is to find the uncertainties in frequency by taking account of inductor being 5% accurate & capacitor being 8% accurate. Homework Equations I believe this is the correct formula...

Hi, I have a project at uni where I am making an approximate analytical expression for a parameter and comparing the result with more rigorous simulations. The thing is: the parameter I am comparing is the 2d-integral of the results from the simulations over some area, and the simulation results...

Homework Statement There is an even-parity SECDED encoded character that has been retrieved ,with the hexadecimal value of BE616. Was there an error? Explain your solution. If you found an error, correct it (reporting the corrected ASCII character) or explain why it could not be...

Hi everybody I'm a newbie and working on LM324 to learn Op-Amp. this is my circuit: http://img4.uplood.fr/free/qx3o_20150425_172843.jpg One of the resistors is 217ohm and another 978ohm. then the gain should be 4.50691 as you can see. so far so good. I know this is for ideal Op-Amp. I applied...

Dear all, I've done many analysis in Maxwell, but in the last ones I'm paying special attention to the error plots. I've been ploting Energy Error and Time Error, but I've got the feeling that I don't know how to properly interpretate it. Fist of all, to validate one simulation, should I...

Homework Statement [/B] 1. After a long road trip during summer break, a college student wants to estimate how long she drove between rest stops. She takes a random sample of 15 stops and records this data in hours: 1.5, 2.6, 1.75, 3.5, 2.25, 3.75, 1.8, 2.9, 3.2, 3.15, 1.5, 2, 3, 2.75, and...

class Cellphone { private String brand; private long serialNumber; private double Price; public Cellphone (String br, long sN, double Pr) { brand= br; serialNumber = sN; Price = Pr; } public Cellphone(Cellphone aCellphone)...

I'm looking for how to mathematically relate X and Y, in such a way that the Chi-Squared per degree of freedom is minimised. However I can't understand how this would work, given that I'm trying to use known X,Y dX and dY (errors) values, to get the related gradient and intercept for the line of...

Typically in problems involving binary classification (i.e. radar detection, medical testing), one will try to find a binary classification scheme that minimizes the total probability of error. For example, consider a radar detection system where a signal is corrupted with noise, so that if the...

The lab called on us to use a vacuum tube to determine an electron's charge to mass ratio. Here is a link to the lab: http://www.clemson.edu/ces/phoenix/labs/cupol/eoverm/index.html. What are some sources of error in this lab? I already know that human error and error in measurement can skew...

Hey guys, I'm pretty new and desperate. I been trying to compile this program for a while and keep jumping from error to error. Currently I have the following error: Error: Rank mismatch in argument 't' at (1) (scalar and rank-1) I have checked that my arrays are correctly. I have checked that...