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.
Homework Statement
Homework Equations
Given above
The Attempt at a Solution
I used polyfit, but my mean swuare errors are way bigger than they should be- don't see what is wrong with my code! My code is ugly btw, my apologies.
%Hw 7
clear all
close all
y3=[1960;
1965;
1970;
1975;
1980...
Hi,
I have 3 values for data set 1 (1a, 1b, 1c), and 3 values for data set 2 (2a, 2b, 2c). (assume set 1 are the ones being compared to)
I know that to work out the error percentage for 1a and 2a -- it is the difference (of 1a and 2a) divided by 1a x 100.
I can do the same with 1b and 2b, and...
Homework Statement
I am doing a lab report and I have to find the slope of a graph as well as the max and min lines of the graph. I also have to find the error in the slope. I have calculated the slope. My first problem is in calculating the error lines. My teacher said i must find the slope...
I'm super confused on why I keep getting an error on this code. I feel like I've tried everything but now I've run into mental block lol. My error message is:
Error (10380): VHDL error at lab2.vhd(6): std_logic type is used but not declared as an array type
Here is the code I came up with...
Homework Statement
I'm doing aproximation of derivative called five-point stencil. For every value of x, in interval [a,b], in step of 0.1 i need to calculate derivative.Homework Equations
[/B]
The equation is like this:
Five-point stencil:
(-f(x + 2h) + 8f(x + h) - 8f(x - h) + f(x -...
Hello! (Smile)
Theorem: Let $f \in C([a,b] \times \mathbb{R})$ function that satifies the total Lipschitz condition and let $y \in C^2([a,b])$ the solution of the ODE $\left\{\begin{matrix}
y=f(t,y(t)) &, a \leq t \leq b \\
y(a)=y_0 &
\end{matrix}\right.$
If $y^0, y^1, \dots, y^N$ are the...
Hi all. I have been trying to understand propagation of error of exponents. Most an. Chem textbooks I see say y = a^x, sy/y = (sa/a)*x. But say y = a*b, then sy/y = ((sa/a)^2 + (sb/b)^2)^.5 . if a = b then sy/y= (2*(sa/a)^2)^.5 = 2^.5*abs(sa/a). This shows the rule y=a^x, sy/y= x^.5*abs(sa/a).
Hi all,
I am to compute A = QR using the Modified Gram-Schmidt algorithm. I need to find the error using
the one norm of : (Q transpose * Q) - I.
Here is my code:
%Modern Gram Schmidt
p=zeros(5,5);
e=zeros(5,5);
g=zeros(5,5);
for k=1:n;
p(:,k)=(A(:,k));
end
%j=k, i=u, r=g, q=e, v=p
for...
I calculated the Edissolution of a reaction and resulted in a negative number. However, during the wet lab the reaction was clearly endothermic since there was a drop in temperature. I used the equation:
∆Edissolution = Ccup∆Tcup/mass of salt
What is the reason for the negative number? Would i...
I have a = {a1, a2, .., a1000}, where this set forms a distribution of photoelectrons (pe) seen by a particular photomultiplier tube (pmt) over 1000 repeated events. I then have N sets of these (N pmts), each containing 1000 pe values which I believe are indeed random and independent. So a, b...
Hello Engineers,
while simulating transformer core losses in transient Maxwell sollution, I have got an error: Current leak to the air.
does anyone ahev idea to solve this problem
Thank you
Hi, to start with my questions I will show you what I have done so far.
(23.56+/-0.05) km/h x (56.3+/-0.4) h
So I ended up with (1326.428+/-12.234) km
But I know the real answer is (1330+/-10) km
What I don't understand is how I would round to that answer. I do not know what I have to look...
Homework Statement
Hello, i have a MATLAB code that simply lists a bunch of parameters with values and an equation that relates all of them together. I am getting on error that says
Error in ==> randelltest at 17
Ys0=Yl*{(Pm-Pc)*Yc/Yl*(1-Av*Tm/2*Yc/Yl)-Av*Tm*Pm/2}*(1-1/B);
Is there a problem...
Thank you all for any help or advice you can give.
1. Homework Statement
What is the fabrication Wavefront error (WFE) of a mirror with a PV surface error of 1 um? Express your answer in terms of RMS waves at lambda = 0.633 um
Homework Equations
WFE=2*SFE
The Attempt at a Solution
I know...
Homework Statement
suppose i measure the time t for 20 oscillations fro a pendulum. the period is T.
Homework Equations
Since T = t / 20
delta T = delta t right?
The Attempt at a Solution
since the 20 is a numerical value, it does not come in the error propagation, does not? when i used the...
Homework Statement
You have a cylindrical tube for which you know the length is 16±0.1 cm and the radius is 8±0.1 cm, what is the error of the volume?
Homework Equations
The Attempt at a Solution
V = π*82*16 = 3216.99 cm
But since the r term is squared, must we account for its error twice...
hi dear friends
i face with this error in Maxwell 3d analysis
please help me
Surface recovery failure. Possible reasons: (1). Model has multiple objects with thin layers. (2). Complex model with object overlapping. (3). True surfaces are skewed
what should i do?
Hi, I'm doing a fit using Chi-square distribution. I have a data set and their errors, I found the best estimate minimizing Chi square, as usual, and I like to found the error bars of my best estimates but I don't know how to do that. Which is the standard form to do it?
Homework Statement
Here is the problem:
Homework EquationsThe Attempt at a Solution
Okay so I was REALLY confused as to why something wrong happened. Here is my work for the whole question:
Sorry for the terrible writing.
Okay so for part a), I derived the transfer function as...
I have several measurements taken over a time series. Each data point has a standard error value. I need to sum up the data points, and determine the error associated with that sum. The error values across the time series are non-normal, so I'm assuming that I can't use the usual error...
Homework Statement
Water is poured into a container that has a leak. The mass m of the water is given as a function of time t by m = 4.9t.8 - 3.0t + 21, with t ≥ 0, m in grams, and t in seconds.(a) At what time is the water mass greatest, and (b) what is that greatest mass? What is the rate of...
Hi everyone, I have a question about the error on certain biological results.
Apologies for the long explanation, but it's not a trivial thing (at least, it isn't for me).
This is what happens:
1. biologists take N solutions of a molecule at different concentrations (say from 10-10 to 10-5...
I have low counting stats and need to subtract background, account for efficiency, and divide by volume. How do I combine the asymmetrical (Poisson) errors?
I'm currently trying to determine the error on the slope of a regression line and the y-intercept.
My y values are: My y error is: My x values are:
27.44535013 0.03928063 136
29.78207524 0.07836946 44
27.4482858 0.0385213 143
27.27481069...
I am using a circuit attached as image and the AC analysis is working perfectly. Output is at the netlist of the AD8139 pin 5. The noise analysis showing the error :
*Analysis directives:
.AC DEC 10 10 1g
.NOISE V19 V[N08184] 30
-------$
ERROR(ORPSIM-16291): Must be independent source (I or V)...
Hello, all,
I am wondering if anyone can provide me information on the historical origin of error analysis; that is, with the quantification and mathematical manipulation of uncertainties in measurement. I find that all the textbooks I have stumbled upon provide a narrative of physical...
I have data from a pendulum and I am using it to work out the radius of the pendulum. I have acceleration in the x and y directions and so thought this would be easy enough. Simply I determine the (velocity in the x direction)^2/acceleration in the y direction. However when I use python to give...
Homework Statement
Find the error bound using Simpsons Rule for integral of SQRT (x) dx from 1 to 9.[/B]Homework Equations
E = (M * (b-a)^5) / (180 * n^4), where M = max value of the 4th deriv of x dx
[/B]The Attempt at a Solution
see attached please - I can't figure out what to use for the...
in my AH physics investigation - measuring acceleration due to gravity, I used the bifilar suspension pendulum btw a light gate was used
for the errors/problems section so far I have problems in making the rod level and keeping the two strings parallel, also all the random, calibration and...
completing my advanced higher physics investigation - measuring acceleration due to gravity
for the oscillating mass on a spring experiment
so far I have included friction between the nail & oscillating rod as a possible source of error
can anyone think of anything else?
thank you very much...
Homework Statement
A series of 5 measurements of Y are recorded with increasing X. (i.e. gradient has units Y/X)
The error in measurement of Y is ±0.05
The error in measurement of X is ±0.005.
How is the error in the gradient calculated?
Homework Equations - measurements[/B]
Y | X...
Hi, let's say in some experiment with ##Z^0## (eg LEP) you are able to determine the "misidentification" of your particles.
Then you can find the efficiency matrix ##M_{eff}## which is given (for ##Z^0## decays to leptons or hadrons):
\begin{pmatrix} N_e \\ N_\mu \\ N_\tau \\ N_{had}...
Homework Statement
Hi Guys,
I am doing a number of questions on finding Rth and can across this example. When I looked at the answers I had a different one to them but I actually think they may be wrong.
Could you guys please take a look?
Homework EquationsThe Attempt at a Solution
So they...
my professor told me any n times differentiable function can be approximated by macularine/taylor expansion.is that true? As far as I know, if the function is approximated at point a, the approximation is valid if we pick a point near a.
however, if we assume that we picked a point of...
Homework Statement
Consider the definite integral, from 0 to 4, e^(cosx) dx
a) Compute the estimate for this integral using the trapezoid rule with n = 4.
b) Find a bound for the error in part a.
c) How large should n be to guarantee that the size of the error in using Tn is less than 0.0001...
I am trying to calculate the steady state error of the following system but unable to do it. I have used MATLAB and calculated the steady state error to be 0.1128 but don't understand the steps that I need to do to calculate this.
Please help.
Thanks
I'm having trouble with error propagation analysis. When you make a single measurement of several variables, say (x,y,z) and you calculate a function f(x,y,z), you just have to apply the common formula of error propagation:
$$\sigma_f(x,y,z)=\sqrt{\left| \frac{\partial f}{\partial x} \right|...
Homework Statement
Find ##v_o(t)## and plot it.
Homework EquationsThe Attempt at a Solution
The solution was provided, and I got all of the same numbers except for one thing. For some reason, in step 3 there is a negative sign in front of ##v_c(t = 0^+)## when calculating ##v_o(t = 0^+)##...
Hi guys,
I have a silly question, but I seem to be confused about it. Let's say I have a function of Newton's cooling law. I measured the exponential drop of the temperature of some system and now I want to make an error analysis. Do I treat this function as a two variable function of tau (time...
Hello
Can anybody help me find my mistake in the following reasoning for light falling on a photodiode :
"When 0.1464 watts/m2 fall on a 7.34 mm2 window, 1.07E-06 watts will penetrate and for a 0.38 A/W photodiode will produce 4.08E-07 amps which, across a 100k resistance will produce 0.0408...
Hi, suppose that you have some function: F(x;a)
where x is the variable with which you plot the function and a is some parameter which enters the function.
If I want to find the error coming from some uncertainty in a, computationally, I would have to plot the function for 2 different let's say...
Hi,
I came across a question in an exam which I couldn't really relate to any topic of physics, that I had studied.
It goes like this-
A detector is used to count the number of gamma rays emitted by a radioactive source. If the number of counts recorded in exactly 20 seconds is 10000, the...
Homework Statement
[/B]
we used a laser pointer as a light source
Homework Equations
I'm having trouble looking for an error in the experiment.
The Attempt at a Solution
I am trying to compile several libraries of FORTRAN code and getting the error message as can be seen in the screen shot. As I do not have any experience with FORTRAN I am not sure what is wrong in the line highlighted line. Any help would be greatly appreciated! Thanks a lot! :-)
Can someone try compiler this and tell me what error you get and what it means? https://github.com/jamkin/CSS-Template-Generator/tree/master/CSS%20Template%20Generator
I get
Mod note: Removed the [ I ] tags and the [ color ] BBCode tags, and replaced with [ code ] tags. There were too many...
There is a quantity (W) that I would like to calculate that is, ultimately, a function of parameters that I can measure directly (a and b),
W = W(a, b)
But I cannot measure a and b perfectly, there will be some uncertainty in these measurements. This uncertainty will propagate into my...
Homework Statement
The problem is given in the attached file.
Homework Equations
Divergence theorem, flux / surface integral
The Attempt at a Solution
[/B]
As you can see I got the question correct using Divergence theorem. But I wanted to make sure that I could arrive at the same answer...
Homework Statement
Hello, Everyone!
So I recently did an experiment in which I pressurised a vessel and then allowed some of the air to move into a smaller vessel and wait for the pressures to stabilise. I then calculated the Cp/Cv ratio and it was slightly lower than the expected 1.40. I am...
Hi guys, I've been tinkering with this code for a while now, as you probably have seen from my other threads. Right now I am working on changing the code around so that it actually writes out the correct output instead of the old output.
I am getting this runtime error:
At line 2057 of file...