search for: homeworks

Hello to all again :) Again, I have an issue with my homework. I was troubling myself for two days, and I still can't get it :( So, if someone can help me, I would be so grateful... HOMEWORK 1. I need to draw function, random walk take the length of walk, and its in 2D. As a result, I have to take matrix in which are i-lines of matrix, written coordinates on i-steps radnom.walk <-

I''m a ruby newbie and have what is probably a relatively simple problem I''m trying to solve. Say that I created a hash: TASKS = { "homework" => "Do Your Homework", "chores" => "Your Have Chores", "exercise" => "Don''t Forget to Exercise" } and then I had an Assignment model with: def

Hello I am trying to solve these problems and I am not allowed to use loops or ifs. 1st Question My first question is that I have generated 100 random numbers from the uniform distribution then A)add only the negative integers. B)add elements until the first appearance of a negative element. I know how to choose the negative elements for A but how to find integers? And I dont know what to do

Is this how a t hypothesis test is done when I don't have the actual data, but just the summarized statistics: > #Homework 9.2.6 [1] > n<-31 > xbar<-3.10 > s_x<-1.469 > m<-57 > ybar<-2.43 > s_y<-1.35 > s_pooled<- (((n-1)*s_x^2) + ((m-1)*s_y^2)) / (n + m - 2) > s_pooled [1] 1.939521 > t_obs <- (xbar - ybar) / (s_pooled * (sqrt(1/n + 1/m)))

Hi , I am having serious trouble doing this homework. I am using R for doing the homework. I am having the following specific problem: a) when I input the data using the command > Wbdc <-read.table("wdbc.txt")? I do not see the data. b) When I want to run histogram using command > hist(area) I get an error message, Error in hist(area) : object "area" not found. ? I am

> Sent: Friday, April 06, 2018 at 5:55 AM > From: "David Winsemius" <dwinsemius at comcast.net> > > > Not correct. You already have `predict`. It is capale of using the `newdata` values to do interpolation with the values of the coefficients in the model. See: > > ?predict > The ? details did not mention interpolation explicity; thanks. > The

Hello List, I have been using Sweave for my homework this last quarter and have been very impressed at how much time and effort it saves me. I, however, have run up against a problem which I have not been able to solve using any of the Sweave/LaTeX tricks I know. I work through my homework one problem at a time, typesetting equations and writing R code, etc. and occasionally use

Dear List, I am using plot for homework. The x-axis covered from 0 to 80, with 4 intervals. However, the plot only showed 0, 40, 80. 20 and 60 disappeared. Please kindly advise how to show 0, 20, 40, 60, 80 for the axis interval. Thank you. Elaine [[alternative HTML version deleted]]

Hello everyone, i`m new here.. I just started with learning R language and i have hard "homework". I need to write function like sort().. Anyone know how to do it? Can u give me algorithm for sorting vector? x=c(1,2,-1,1,3,4) or something like that.. I`m sorry for my english.. -- View this message in context: http://n4.nabble.com/Help-me-with-writing-function-sort-tp1836063p1836063.html

No homework. Just a genuine question On 23 July 2017 at 22:00, Bert Gunter <bgunter.4567 at gmail.com> wrote: > Homework?? There is a no homework policy on this list. > > Cheers, > Bert > Bert Gunter > > "The trouble with having an open mind is that people keep coming along > and sticking things into it." > -- Opus (aka Berkeley Breathed in his

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> On Apr 6, 2018, at 8:03 AM, David Winsemius <dwinsemius at comcast.net> wrote: > > >> On Apr 6, 2018, at 3:43 AM, g l <gnulinux at gmx.com> wrote: >> >>> Sent: Friday, April 06, 2018 at 5:55 AM >>> From: "David Winsemius" <dwinsemius at comcast.net> >>> >>> >>> Not correct. You already have

> On Apr 6, 2018, at 3:43 AM, g l <gnulinux at gmx.com> wrote: > >> Sent: Friday, April 06, 2018 at 5:55 AM >> From: "David Winsemius" <dwinsemius at comcast.net> >> >> >> Not correct. You already have `predict`. It is capale of using the `newdata` values to do interpolation with the values of the coefficients in the model. See:

On 09/04/16 06:57, Muhammad Bilal wrote: > Hi All, > > I am new to R and don't know how to achieve it. > > I am interested in generating a hypothetical dataframe that is consisted of say two variables named v1 and v2, based on the following constraints: > 1. The range of v1 is 500-1500. > 2. The mean of v1 is say 1100 > 3. The range of v2 is 300-950. > 4. The mean of

Hi, I have the following in a viewer Here, @lst = Homework.find(:all) is an array of homeworks. I checked this this is correct. Based on the error below, somehow, the url_for_file_colum does not like to act on the model element. I checked the source code to url_for_file_column, and the problem is with instance_variable_get(). I have no idea wat is going on! Any help is appreciated. Gordon...

Homework?? There is a no homework policy on this list. Cheers, Bert Bert Gunter "The trouble with having an open mind is that people keep coming along and sticking things into it." -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip ) On Sun, Jul 23, 2017 at 11:43 AM, Davide Piffer <pifferdavide at gmail.com> wrote: > I have a df with a vector v. For

Hi, I am teaching a one month class in applied statistics and want to bring my students up to speed in R without devoting much/any lecture time to R instruction. I think that the best way to do this is to provide them with a lot of R questions for homework. These questions would be numerous (there is a lot of material to cover), go from very simple to somewhat complex, and focus on all the

This is not an R question but if anyone can help me, it's much appreciated. Suppose I have a series ( stationary ) y_t and a series x_t ( stationary )and x_t has variance sigma^2_x and epsilon is normal (0, sigma^2_epsilon ) and the two series have the relation y_t = Beta*x_t + epsilon My question is if there are particular values that sigma^2_x and sigma^2_epsilon have to take in

Hi just a quick question in which I must use the "function and return" part of R. If I was asked to define a function called "median" where the function has a single argument x and returns the median value of a vector. How would I go about saying the median = element x in terms of n (say (n + 1)/2 or whatever it would be) if there is an even amount of elements, or x in terms

Hi to all...i'm a new R'user and i have to solve some exercies so i ask to tou for an help... 1.) How i can demonstrate in R that the limit for x-->infinite of (1+1/x)^x is equal to "e"? 2.) if i have a vector of values how can i create a function that, applied to my vector, give me "median", "mean", "Var" and "length" togheter?