function

1. a function created does not work

Hello, I had created a function and I aimed to verify if it complies with certain data and if it was, then it is stored in another variable. data = c(12, 20, 11, 16, 18, 32, 22 , 8) class = function(N){} tabla1= c(1:8) for (i in length(N)){ if (data[i]<21.78){ table1[i]= data[i]...
2. Probability Mass/Density Function

Hi, I have a matrix of 24x15500 (time x no.of occurrences of an event). The number of occurrences is in the form of binary (0/1). I took the percentage of occurrence for each time, so I ended up getting the following 24x1 matrix. 1 0.999935612645676 1 0.994913399008435 0.973150473247054...
3. How to generate many load profiles of EV superchargers in R

Hi guys :wave:, I make balance simulation of load profile electric vehicle chargers in R. I use CHADEMO (45 kW). I need to genarate a lot of profiles. I can make one profile, but it is not convenient. See example: Chademo1=numeric(1440) ### minute time axis a day for...
4. Total and quadratic variation of a function

Let f(x)= x2−3, for x<3, x2+3, for x≥3 I need to determine the total variation and the quadratic variation of f(x) on the interval [−4, 4]. For the total variation, I guess I can use my raw way to do it. It means see that f(−4)=13, f(0)=−3, f(2.999999)=5.99999, f(3)=12, f(4)=19. So...
5. Passing a function as an argument

Hi all, I'm currently taking an online course on R on coursera. I'm at a point in the class where this concept is a little fuzzy to me. Can someone throw an example of this? I'm googling like mad, but comse of the tutorials are a little advanced. Thanks, Randy
6. Way to pick apart Discriminant Function Analysis?

Hi there, I'm new to the site, this is my first post! I've run a discriminant function analysis by entering syntax into SPSS. My data consists of sets of fish separated by species, and each species group has individuals ranging from 4 to 53 specimens. I have my output which is showing me...
7. Generating peer nomination dataset in R

Hi all, I have been trying to generate a dataset on peer nominations in R. Often in research participants are asked to nominate others in the peer group (or classroom) as a friend. My requirements Each peer has to nominate x other peers as friends Participants can't select themselves...
8. Want to know Expression of t.test

There is a function t.test in R , i want to know the expression of t.test function; how can i know it. Example : We have simple "mean" function in R and i want to know the all expression for calculating mean function or expression written for mean function.
9. Create simple function to average column over different ranges of rows

I've learned how to subset a group of rows I am interested in from a matrix, and average those values. The data set shows the percent of light reflected at many different wavelengths (rows). If I want to know the average amount of light reflected at ~900 nm, I use the following code to...
10. Infinite sum in R

Hi dear R users, Is there any way for define following function in R? Thanks.
11. Power of t-test

Hello all, I want to write an R procedure that calculates the power of a simple two samples t-test. Does anyone here has an idea how to do it ? Thank you !
12. Converting Numerical Value Ranges into Ordinal Values.

Hello everbody I need help with 2 issues. First one; When I use calculate values menu, and I create body mass index function from weight and height variables, and I say calculate, spss calculates BMIs and writes them in cells. But when I update information, BMI for that particular case won't...
13. Function Lines (error when used with fitted values of a truncated regression model)

Hi everyone, I'm having some trouble with the function lines() in R. Here is an example of the code: <code> x=rnorm(100) y=10+2*x+pmax(x-0.5,0)+pmax(x-0.7,0) model=lm(y~x+pmax(x-0.5,0)+pmax(x-0.7,0)) plot(x,model$fitted.values) lines(x,model$fitted.values) </code> I want the function lines...
14. how to create a vector from function outputs

Hi everyone, I'm a complete beginner with R and am trying to use it for my maths project, however I'm getting stuck with what I reckon are some quite elementary things, just because I've never used it before and am teaching myself. This is what I have so far and what I am doing: popr =...
15. Help finding a multivariable probability density function?

I'm working on a mathematical modeling problem, where the following diagram will aid my description: http://bnware.ndforums.com/dr_dia.png A signal is detected by two posts which are separated by 5.43 miles (seen on the left side of the diagram.) The blue lines represent the lines of...
16. cumulative distribution function problem

I have this question I am trying to get through but i keep coming into trouble. The question is: Show that the cumulative distribution function from a uniform distribution of the random variable is Fx(y) = (y-a) / (b-a) for some a < y < b I've started the question but have become stuck...
17. Finding Probability Density Function

Hi guys, I need help with the attached question. Appreciate your quick response.
18. Iterative data generation

I have a question about generating data based off of a loop... I am trying to output a 100 x 3 numerical matrix observations that are described by the following: p1_t=(p1_{t-1}*w1_{t-1})/(\bar{w_{t-1}}) p2_t=(p2_{t-1}*w2_{t-1})/(\bar{w_{t-1}}) p3_t=(p3_{t-1}*w3_{t-1})/(\bar{w_{t-1}})...
19. Simple user-defined function in R

Hi, i was looking through the forum but unfortunately couldn't find solution for my problem. I need to use simulation to show that sums of independent uniform random variables approach a Gaussian distribution. I want to write function of m, n, a, b , where m is number of simulations, n is size...