Error Definition and 998 Threads

An error (from the Latin error, meaning "wandering") is an action which is inaccurate or incorrect. In some usages, an error is synonymous with a mistake.
In statistics, "error" refers to the difference between the value which has been computed and the correct value. An error could result in failure or in a deviation from the intended performance or behavior.

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  1. P

    I Error of the WKB approximation

    hello everyone I tell you a little about my situation. I already found the approximate wavefunctions for the schrodinger equation with the potential ##V(x) = x^2##, likewise, energy, etc. I have the approximate WKB solution and also the exact numeric solution. What I need to do is to calculate...
  2. S

    B Error in approximation to log(223)/log(3) .... senior moment?

    This is probably a silly question, but I am really stuck. A possible senior moment, is my only excuse. Here is an approximation: ##log(223)/log(3) \approx 10818288 / 2198026 ## So we have: ##log(223)/log(3) - 10818288 / 2198026 = 0.0399292## which is OK but not great -- the error shows up...
  3. K

    A Error signal when locking a cavity

    Hello! I am trying to lock a laser to a bow-tie cavity. I managed to align the cavity to a certain degree but when I lock it, the error signal looks as below. I do get a significant power enhancement (although about 10 times smaller than expected) and the lock is relatively stable, but the error...
  4. M

    React - load new image - error - part 2

    It works with this code! If I want to write a text next to the image do I use <div> ? I mean : return <div><div><img src={logo} alt="Logo" width="40" /></div><div>Title</div></div>; 🤔
  5. M

    How to Correctly Load a New Logo in React?

    Hey! :smile: I need some help in react. I have a code for a web application and I want to change the logo. The logo I want to use is in the public folder, in this folder there is also a favicon with the old image. In the src folder there is a folder images with the old image. In the src folder...
  6. V

    Comp Sci Finding Optimal h for Truncation Error O(h2)

    Part (A) I have already determined the truncation error of order O(h2). Part (B) I'm struggling with how to approach this part. I do not really understand where to begin to figure out what value of h is the approximation the smallest. Is this looking for a particular range? Or are we isolating...
  7. M

    I Error propagation and symmetric errors

    Hello! I am a bit confused about how to interpret symmetric error when doing error propagation. For example, if I have ##E = \frac{mv^2}{2}##, and I do error propagation I get ##\frac{dE}{E} = 2\frac{dv}{v}##. Which implies that if I have v being normally distributed, and hence having a...
  8. V

    Least count error Vs Least count

    I know that least count is the smallest measurement that is possible with a measuring device. But I fail to understand the exact meaning of least count error. According to my textbook, the following is the definition of least count error. "Least count error is the error associated with the...
  9. M

    Python Any help with this error in Scipy minimize function?

    Hi PF! When I execute the code below: import numpy as np from scipy.stats import t import scipy.optimize as optimizeglobal data data = np.random.normal(loc=50, scale=1, size=(2400, 1)).flatten() def L(F): M = 250 lmda = 0.97 sig_0 = F[0] for i in range(1, 12): sig_0 +=...
  10. ramana3797

    I need help to fix a Quantum Espresso installation error in Linux

    I'm a M.Sc physics student and I need to use quantum espresso for my research project . I tried the same procedure I used to install it on the system at home as I did for the one at the College but i keep getting the same error . I can't find why . I'm also new to linux . I'm using ubuntu and I...
  11. R

    I am trying to create the configuring for pytest, but I'm am getting an error

    Also the code is in python flask. Here is the code updated https://github.com/NML240/flaskblog2 Here are 2 relevant files https://github.com/NML240/flaskblog2/blob/main/app/config.py and https://github.com/NML240/flaskblog2/blob/main/app/tests/conftest.py. In conftest.py I created config...
  12. pandatime

    Finding the Right Spring Force: A Tale of Error and Redemption

    What I've done so far is find the spring force through ##F_s = -kx## ##F_s = -111*16.7## ## = -1853.7N## My conclusion was that since this is the spring force, the tension force must be just the negative of that so ##1853.7N## because the net force has to balance out, but I am horribly...
  13. Ryan89

    Fatal Error The Surface Appears More Than Once in A Chain

  14. D

    Can this be solved without trial and error?

    Hi everyone The following problem looks like it needs to be solved by trial and error. Is there a quicker way to do it? I had the answers (but not solutions), so I simply worked backwards to get 11^2-8^2=57. If I had to solve it, I would have made a list of the final digits you'd get if you...
  15. tysonman166

    MCNP6 Fatal Error : Models required

    Hi! so its me again. After previous problem already solved now i ran into another problem. now about BURN card. its said need model? what kind of model? I tried using .84c for all my material but doesn't seems to work! heres my code if anyone wants to try :-( c TWR-P...
  16. hilbert2

    I Error tolerant normal mode frequency

    If a Hookean spring-mass system is made from one mass and a spring, to produce a system with a particular oscillation frequency, it's not a problem to use the propagation of errors concept to find how this frequency responds to small errors in the mass and spring constant. If a chain of...
  17. Buzz Bloom

    I I have an error in integrating to calculate the age of the Universe

    NOTE: I am attempting to convey the equations in this post into LaTerX format in Post #19. My result is way off. It is about 7.44 x 10^9 years. The values I use are: 1/H_0 = 14.4 X 10^9 years, M = Ω_m = 0.3103, and L = Ω_Λ = 1 - Ω_m = 0.6897. The equation I start with is the following. dt =...
  18. C

    I Calculating Collection Rate Error in Labs

    Hi all, I'm having a bit hard time performing error calculations on one of the lab results I got. The lab dealt with finding collection rate of a certain material onto a wire. While inside a vial, the wire was soaked in the material for a specific period of time. Then the wire was taken out of...
  19. mcastillo356

    B Mean-Value Theorem, Taylor's formula, and error estimation

    Hi, PF Taylor's formula provides a formula for the error in a Taylor approximation ##f(x)\approx{P_{n}(x)}## similar to that provided for linear approximation. Observe that the case ##n=0## of Taylor's formula, namely, ##f(x)=P_{0}(x)+E_{0}(x)=f(a)+\dfrac{f'(s)}{1!}(x-a)##, is just the...
  20. R

    I am getting an error Import "_frozen_importlib" could not be resolved

    Here is the error when I run python -m pytest ERROR collecting test session _______________________________________________________________________________ ..\..\..\..\anaconda3\envs\flaskblog2\lib\importlib\__init__.py:126: in import_module return _bootstrap._gcd_import(name[level:]...
  21. shivajikobardan

    Comp Sci Troubleshooting Index Error 7 in Decoding

    Source of my knowledge-: Encoding-: Decoding-: Other references-: Question-: There is no entry for index 7 in the dictionary while decoding, how do I fix this issue?
  22. A

    MCNP6: Getting a "10 particles got lost" error

    MCNP6 gives me a "10 particles got lost" error when I try to run the attached input file modeling a 3x3 fuel lattice surrounded in coolant. As I understand it, this error is usually related to the geometry/surface definitions of each component, but I'm unsure of what the source of the error is...
  23. B

    MHB Point Estimate, Margin of Error and Confidence Level

    1. One of the few negative effects of quitting smoking is weight gain. The data below shows the weight gain (in pounds) of 18 respondents 12 months after they quit. If the mean gain follows a normal distribution with a standard deviation of 9 pounds, estimate the mean weight gain of the 18...
  24. manareus

    Estimating maximum percentage error using partial differentiation

    Attempt at question No. 1: ΔD = ∂D/∂h * Δh + ∂D/∂v * Δv ∂D/∂h = 3Eh^2/(12(1-v^2)) ∂D/∂v = 2Eh^3/(12(1-v^2)^2) Δh = +- 0,002 Δv = 0,02 h = 0,1 v = 0,3 ΔD = 3Eh^2/(12(1-v^2)) * Δh + 2Eh^3/(12(1-v^2)^2) * Δv Because the problem asked for maximum percentage error then I decided to use the...
  25. mcastillo356

    B Linearization of a function error viewed with differentials

    Hi, PF, want to know how can I go from a certain error formula for linearization I understand, to another I do not Error formula for linearization I understand: If ##f''(t)## exists for all ##t## in an interval containing ##a## and ##x##, then there exists some point ##s## between ##a## and...
  26. benjicre97

    MinGW - error message using "make"

    Hello, I have a problem using MinGW. When I write "make" during the installation, this error appears : $make cd ./src;make make[1]: Entering directory '/home/benji/auto/07p/src' gfortran -fopenmp -O -c maps.f90 -o ../lib/maps.o maps.f90:97:41: 97 |...
  27. N

    Medical Error measuring glucose optical sensor

    Hello We have designed an optical sensor to measure glucose. But we do not have the same changes for different concentrations. What do we need to do to be able to observe different Lifetime concentrations? In our sensor test, we used phosphorescence and glucose oxidase technology. The sensor...
  28. K

    I How Is Uncertainty Calculated for the Mean of a Gaussian Function in MATLAB?

    Hello! If I have N points (x,y) which I know they are described by a Gaussian i.e. y(x) is a Gaussian of unknown mean and standard deviation, and each y has an associated error of ##\sqrt{y}##, is there a general formula for the uncertainty on the mean of this function? Thank you!
  29. JD_PM

    Error when creating boundary conditions (OpenFOAM)

    Let's give some context. I created a Mesh via snappyHexMesh and next I am setting the boundary conditions (BCs). First I copied the patches folder "createPatchDict" to my system's folder via the command "cp $FOAM_ETC/caseDicts/mesh/manipulation/patches/createPatchDict ./system" Taking into...
  30. B

    Python Input error for LSTM neural network

    Hi everyone, I have to classify a DNA sequence with a LSTM neural network but I have a problem with the inputs shame. Both the sequence and the class are encoded with One Hot Encoding and my code is this: import pandas as pd import numpy as np data = pd.read_csv('splice.data', header = None)...
  31. M

    Can anyone please verify/check if there's error in this word problem?

    Proof: Let x be the number of dollars and y be the number of cents in the check. Then we have 100y+x-68=2(100x+y). From the hint, we get the following Diophantine equation: -199x+98y=68. Applying the Euclidean Algorithm produces...
  32. anorlunda

    NTSB Accident Report, Data Entry Error

    On September 8, 2019, the 200m long vehicle carrier ship Golden Ray (carrying 4067 Kia, Chevrolet, GMC, GM, Mercedes-Benz, and Ram vehicles) capsized in St. Simons Sound, Georgia, USA The accident caused the loss of a $62 million ship, $142 million in lost cargo, and $250 million in salvage...
  33. angweieng

    Troubleshooting MCNP6.2 Error: l_list Too Small

    Hi everyone, I have used MCNP6.2 for few years. This is the first time that I encountered the error such as below: bad trouble in subroutine mars_xs_init of imcn l_list too small. I tried to run an input deck and track a bunch of decay isotopes. Is anyone has similar...
  34. mcastillo356

    I Error bounds for Newton's Method

    Hi, PF Sometimes it is not easy to find roots of functions. Newton gave a nice clue: the Newton's Method formula: ##x_{n+1}=x_n-\dfrac{f(x_n}{f'(x_n)}##. My concern is, now that I have understood and practiced it, comprehend what I've sketched in the summary. This is all taken from "Calculus...
  35. G

    Help Solving 2 Qs: Tan(Ɵ) & Sign Direction Error

    Could I please ask for help with the following question: The last part follows easily from the first part. Answer from back of book for first part is: 2/(3u') <= tan(Ɵ) <= 2u What I have done is the following: Here's my diagram (I have separated the components to show the internal forces...
  36. S

    Is the animation/graphics for NASA's Webb telescope in error?

    I am looking at the webpage for the status, and it seems to me that there is a big error in the graphics: https://webb.nasa.gov/content/webbLaunch/whereIsWebb.html?units=metric It shows the Earth such that it appears that the axis of rotation is going from the bottom-right to the lop-left...
  37. A

    Lex and Yacc declared type -- Getting an error

    in .y code: %union{ int ival; int *ivals; char id[20]; char *str; bool *b; } %start START %token COMMENT OP_PLUS OP_MINUS OP_DIV OP_MULT OP_OP OP_CP OP_DBLMULT OP_OC OP_CC OP_COMMA KW_AND KW_OR KW_NOT KW_EQUAL KW_LESS KW_NIL KW_LIST KW_APPEND KW_CONCAT KW_SET KW_DEFFUN...
  38. C

    I What is this formula measuring error?

    Variance and standard deviation and other measures of error I understand. This formula doesn't behave well for data sets centered around zero and also has other problems, like scaling differently as N increases than the standard deviation or standard error. Does anyone recognize this and can...
  39. shivajikobardan

    Python Error occurred in pycharm python IDE

    # # A fatal error has been detected by the Java Runtime Environment: # # EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x00007ffd51d4257f, pid=9852, tid=11684 # # JRE version: OpenJDK Runtime Environment JBR-11.0.12.7-1504.40-jcef (11.0.12+7) (build 11.0.12+7-b1504.40) # Java VM: OpenJDK 64-Bit...
  40. M

    MHB Tree Diagram - Error at production

    Hey! 😊 One box contains ten production parts, four of which have a production error. Three parts are removed from the box one after the other without putting them back. We consider the following events : A : the first production part that is removed is OK B : the second production part that...
  41. A

    Engineering Digital Communications: Bit Error Rate (BER), C/N, Constellations

    Problem Statement: I am not quite sure how to approach this problem and would appreciate the help. I how the C/N is closely related to the SNR (Eb/N0), but the question does not give the bandwidth or data rate for me to use the formula above. From the constellation diagram, my guess is this is...
  42. patric44

    Problem in evaluating the absolute error

    hi guys i came across this simple question about evaluating the absolute error, the solution is very simple as following : $$ m_{man} = M_{b+m}\pm\Delta\;M_{b+m}-M_{b}\pm\Delta\;M_{b} $$ so the mass of the man alone is $$ m_{man} = (M_{b+m}-M_{b})\pm(\Delta\;M_{b+m}+\Delta\;M_{b}) $$ which would...
  43. M

    Error calculation in a measurement chain

    [Mentor Note -- thread moved to the schoolwork forums from the technical forums] Summary:: I would like to understand how to calculate the error of a measurement provided by a measuring chain Hello to everyone, I'm going to explain the problem I would like to understand better. Thank you for...
  44. nuclearsneke

    How to finally run an input file via VISED/MCNP5 without error?

    Howdy, my fellow nuclear colleagues! I am new to MCNP5 and currently I am trying to simulate something simple like a sphere of UO2 to calculate its critical size. Whenever I run my file via MCNP5 or Vised, I get an error message like bad trouble in subroutine pass1 of imcn...
  45. C

    Can I improve the sinc interpolation?

    Hello everyone. I am working with mathematica, where I have developed a two-dimensional shannon interplation, just as can be seen in the slides 15 to 18 of this presentation. The code is as follows: savedX = Table[XposX = mat[[All, 1]]; YposX = mat[[All, 2]]; windXVal = mat[[All, i]]...
  46. A

    Java Error in Installing javac for fedora 20 and java version 1.6

    By default, I had Java 7 installed on my system(X64, Fedora 20). I needed Java 6 for a software, hence had to remove 7 sudo yum remove *java* And then, I installed Java 6. This installs Java 6 successfully. but the java compiler, JavaC is missing. For that, I try - su -c "yum install...
  47. F

    A Photometric Galaxy Clustering Error and Poisson Noise

    The error on photometric galaxy clustering under the form of covariance which is actually a standard deviation expression for a fixed multipole ##\ell## : ## \sigma_{C, i j}^{A B}(\ell)=\Delta C_{i j}^{A B}(\ell)=\sqrt{\frac{2}{(2 \ell+1) f_{\mathrm{sky}} \Delta \ell}}\left[C_{i j}^{A...
  48. ohwilleke

    I Why Do Physicists Use Gaussian Error Distributions?

    David C. Bailey. "Not Normal: the uncertainties of scientific measurements." Royal Society Open 4(1) Science 160600 (2017). How bad are the tails? According to Bailey in an interview, "The chance of large differences does not fall off exponentially as you'd expect in a normal bell curve," and...
  49. rifal

    How do I fix the error connecting Snort and BASE databases?

    I installed snort and I want to connect the database with BASE but an error occurs, I don't know where I went wrong, everything is running smoothly but not with BASE connection with the database I suspect if I'm wrong when running the command: # sudo mysql_secure_installation what should i do...
  50. Wannabe Physicist

    Computing Errors when Data Sets are Given

    This is for the lab report I have to submit. ##n## is the refractive index. ##L## is the length of a gas chamber and ##m## is the number of fringes passed as the pressure in the gas chamber changes by ##\Delta p##. We are already given the error in ##L##. I performed the experiment and obtained...
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