search for: mathmatical

Hello, I'm a new user to R and need some help coding a mathmatically simple aggregation of normal distributions. I have three normal distributions: A ~ N(8.51, 4.24^2) B ~ N(7.57, 3.62^2) C ~ N(10.84, 6.59^2) with correlation coefficients of: rho(AB) = 0.710 rho(AC) = 0.263 rho(BC) = 0.503 and I want to simulate Z = A + B + C, showing the results on a plot and fit...

...arge weather information from every zone of the world,I want to extract only a part of them to calcuate, like the information in a city or the information between exact latitute range and longtitude range, can r tool help me to do that or in some point r tool is a statitcal software which focus on mathmatical caculation and the user have to translate the special data files into some data structure like array or vector by himself, then the r tools use the array or vector to calculate? I am very looking forward to your reply thanks very much sincerely mat chueng [[alternative HTML version deleted]]

Dear R helpers     Suppose I have a following data   y  <- c(9.21, 9.51, 9.73, 9.88, 10.12. 10.21)   t  <- c(0, 0.25, 1, 3, 6, 12)   I want to find out the polynomial which fits y in terms of t i.e. y = f(t) some function of t.   e.g.   y = bo + b1*t + (b2 * t^2) + (b3 * t^3) + ...... and so on.   In Excel I have defined y as independent variable, then defined t, t^2 and t^3 and using

...nges happen to lie on a curve, so I'll have some staring to graphs to do. Anyway, if the second permutation of the coefficients is used I think this will work better. (the first one with a 2D curved surface to represent change instead of a 1D curve may work too though) So, which on is the mathmatically correct one? Oh, and another question I just remembered: audio signals are signed, because they're representations of the movement of the microphone. Video data does not have that, but the wavelet transform does expect signed data (or doesn't it? Haar works on unsigned data but what...

...el, mixing it into the other 5 is acceptable, as is >> ignoring it. Don't know how safe that is in practice. >I just can't figure out what the orignal logic is for 5.1 to even HAVE a >seperate subwoofer channel. But a lot of the decisions behind the dolby >5.1 stuff are not mathmatically sound or even intutivly sane. IIRC it was to use as few bits as possible, w/o distorting the cheapa$$ speakers most people throw in the corners behind the couch with bass signal. (Mustn't take space away from the anti-piracy bits!). Another guess is, with a choice of only two from this lis...

> -----Original Message----- > From: Eric Wieling [mailto:eric@fnords.org] > Sent: Friday, March 11, 2005 1:52 PM > To: Asterisk Users Mailing List - Non-Commercial Discussion > Subject: Re: [Asterisk-Users] Re: Incoming echo cancel > > > Nenad Radosavljevic wrote: > {clip} > > > > Anyone have an idea, why this type of echo happens ? As far as I have

...e this approximation just gives an initial solution, the end result of the function is still correct. To fix the approximation, in the snippet below the line gamma = sigma; should be replaced by gamma = 1.0/sigma; /* the skewness */ The reference is Abramowitz and Stegun 'Handbook of Mathmatical Functions' pages 935 and 928 Mikael double qpois(double p, double lambda, int lower_tail, int log_p) { double mu, sigma, gamma, z, y; #ifdef IEEE_754 if (ISNAN(p) || ISNAN(lambda)) return p + lambda; #endif if(!R_FINITE(lambda)) ML_ERR_return_NAN; R_Q_P01_boundaries(p, 0,...

I have installed a Windows Program on Unix and running under Wine. The program is a DRM solution aimed at creating secure documents, at the stage of creating the document, the program fails. The company does not support this program on Unix, can anyone who is more experienced than I am with unix offer any suggestions how this might be investigated further to find what is going wrong? For example

Hi all, We have just installed a * server (CVS head) with a TE110P card and a IDSN20 line, we are using the GXP-2000 handsets running the latest firmware (.9). Some of the calls we are receiving have echo at the our end (we can hear ourselves speak). We have a traditional ISDN telephone system here as well and when I make a call from one of the handsets asterisk answers, directs the call to

Please can someone take a look at the attached file which shows the output on my machine of zfs list -r -t filesystem,snapshot -o space rpool/export/home/matt The USEDDS figure of ~2GB is what I would expect, and is the same figure reported by the Disk Usage Analyzer. Where is the remaining 13.8GB USEDSNAP figure coming from? If I total up the list of zfs-auto snapshots it adds up to about 4.8GB,

Dear colleagues, i am carrying out an ordinal regression model. I try it on SPSS but I "flirt" with R as well. I have a few questions. 1. What is the most reliable/tested/trusted package for ordinal regression in the R world? 2. Also, I have a statistical question. What is the danger of having to many 'empty cells' in ordinal regression? How many empty cells are too many? Do