Thanks for the reply. I was hoping I could have the null hypothesis set up such that I would be rejecting the null-hypothesis of dependence. This should permit me to know when there is evidence to suggest that the two variables are dependent, right? If that is the case, then my earlier comment...
I have a 2x2 contingency table, and I want to discover how likely it is that the two events are dependent.
The top-left cell is usually in the range of 1-10. The bottom-right cell can be over 3 billion. The other two cells are in the hundreds or millions (exclusively).
I have tried Pearson's...
I have been thinking about this for quite a while, and thought of the following simulation:
for node in graph:
node.x = <arbitrary value near 0> must be distinct per row
node.velocity = 0
for number of STEPS:
for node in graph:
node.accel = 0
for node's row...
Firstly, let me excuse myself for not knowing the most appropriate location to post this question. This is a question pertaining to Graph Theory, but the heart of the application is intended to be driven by the math and/or simulation of classical physics.
At work I am currently attempting to...
I stumbled across an interesting connection between partitioning n into k parts from any finite subset of the natural numbers and the partition functions p(n) and q(n).
To be precise, if n,k are non-negative integers, S \subset \mathbb{N}, and S has a maximum:
Let p_{S-k}(n) be the number of...
I just found an excellent resource.
http://functions.wolfram.com/IntegerFunctions/PartitionsQ/introductions/Partitions/ShowAll.html
It covers both of the functions you mentioned, p(n) (unordered partitions of n with repetition) and q(n) (unordered partitions of n without repetition) concisely...
That observation is related to the problem I was trying to solve! I realize now that a subproblem of what I'm doing is counting the number of ways to partition a natural number into any number of unordered positive parts. This equation was a piece of the resulting generating function (the part I...
I have an equation of the form (1-x)(1-x^2)(1-x^3)\cdot\cdot\cdot(1-x^n). Or, in maple notation, product(1-x^a, a=1..n).
I've been trying to find a way to express this as an expanded polynomial in sigma notation so that I can extract coefficients (for an enumerative generating function). If the...
If friction and air resistance are negligible, it's a whole 'nother question you're dealing with. The change in velocity would depend entirely in the change in graviational potential energy (the vertical work done by gravity), otherwise energy is conserved and Ek is still the same. If Ek is...
That's one thing I wasn't clear on myself, and need to explain better once I understand it more. I don't think it's so much that it's bending it, but that the waves can go around obstacles. And that results in interference. Similar to the Double Slit Experiment. I think... Clarification, anyone?
I could not find an objective explanation of Diffraction Spikes anywhere... not even on Wikipedia. Most sites just referenced little things you could do, and the overall effect. I found a couple sites that explained very briefly what happens, so I tried to piece together all of these things to...
It seems like it'll be anything that obstructs light directly before entering the lens. You can even place strings in front of a telescope and get diffraction spikes (as russ_watters has apparently done).
It's always up with respect to the orientation of the camera. I took another picture to clarify:
http://img142.imageshack.us/img142/9733/physicsphotorotatekn4.jpg [Broken]
So I guess that means it has to do with the lens inside the camera. Is there anything specific I can research?
I've taken a picture of my christmas lights. I'm wondering if someone could help me explain, or at least name, the phenomenon?
http://img142.imageshack.us/img142/5925/physicsphotocontestto9.jpg [Broken]
Why does light appear to come from 4 distinct points around the light? Even though...
Ah, I gotchya. I've taken note, and have lots more ideas for additions. :)
Unfortunately I'm going to have to restrict the report now to kinematics and planetary motion. It's already getting really bulky. But I'll try to fit in more "what if" scenarios for the scale and such.
Too bad I...
Well what I said is that it measures the magnitude of the normal force. This is then internally proportioned to "weight" by the balance...
It should be the same.
I'm wondering why I'm being quizzed. Could someone begin to correct me? I'm sure I've made mistakes all over the place. ;)
Well this is what I have for my current chart of how bodies of different masses affect eachother.
For each negative object, the acceleration opposes the direction of the force of gravity, since Fnet = ma and m is negative.
For each positive object, the acceleration is in the same...
A negative mass and a positive mass would both exert repelling forces against eachother, correct?
But the effect of a repulsive force on a negative mass still results in acceleration towards the positive body, because Fnet = ma, and m is negative, so acceleration is in the opposite direction...
This isn't really a homework question... but it is homework... and I have a question... so I thought I might as well post it here.
This is part of my grade 12 Physics curriculum. For our project, we're supposed to ask ourselves "What if <this happened>?"
I chose to do mine on negative...
Whatta, what I had just finished describing was client side.
AJAX is client side. A request is client side. The client builds a request, with javascript, and sends this request to a server. That's AJAX.
No, I think whatta meant that since AJAX has to construct a request to the server manually, it's not encoding the request correctly. Make sure AJAX is correctly encoding it.
In AJAX, you have to manually encode everything, or use an appropriate encode function. For example, in AJAX you have...
Are you sure you aren't overcrediting your sources? I've got these facts from O'REILLY, which is a highly credible source for programming. Plus if you print out the constant FLT_DIG from float.h you get 6.
#include <stdio.h>
#include <float.h>
int main( ) {
float pi_1 =...
Edit :
You know you're too old... when? When you treat everything as it was back in the (good old) days, when we used C. I forgot we're talking about C++ standards here. Apolagies D H.
Another thing that I didn't realise is that C will automatically round for you anyways.
ISO 9899 and...
I have one question and one "warning".
Why does the user input values in inches, but then cost in $/cm? Was that your choice, or might that be a mistake? Seems quite awkward.
You define pi as 3.14159265, but on a standard compiler, float stores the first 6 digits. 3.14159265 will become...