logo
down
shadow

Sum vector with number by dinamic intervals without looping


Sum vector with number by dinamic intervals without looping

By : kjelle
Date : November 19 2020, 03:01 PM
this will help You can use apply() to go though your start-finish data.frame, check if the numbers are between start and finish values and sum up the logical vector returned from data.tables' between() function.
code :
Numbers<-c(0.1,0.2,0.3,0.7,0.8,0.9,0.91,0.99)

sf <-
read.table(text = 
"Start   Finish
0.00    0.86
0.87    0.89
0.90    0.98
0.99    1.00",
header = TRUE
)

apply(sf, 1, function(x) {
  sum(data.table::between(Numbers, x[1], x[2]))
})
5 0 2 1


Share : facebook icon twitter icon
giving lots of intervals [ai, bi], find a interval which intersect with the most number of intervals

giving lots of intervals [ai, bi], find a interval which intersect with the most number of intervals


By : Kobus van vuuren
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Suppose the intervals are given as (a1,b1), ..., (an,bn). Make a sorted array of length 2n where ties are broken by
if ai = aj, then put ai first iff bi < bj if bi = bj, then put bi first iff ai < aj if ai = bj, then put ai first
Given a vector of intervals output any one number within the interval that has been overlapped the most times

Given a vector of intervals output any one number within the interval that has been overlapped the most times


By : user3376867
Date : March 29 2020, 07:55 AM
I hope this helps you . Here is a simple O(n log n) solution which uses events and sweep line:
Matlab: How to turn a vector of 2928x1 into a vector of 8784x1 with specific intervals of elements?

Matlab: How to turn a vector of 2928x1 into a vector of 8784x1 with specific intervals of elements?


By : Gloria
Date : March 29 2020, 07:55 AM
With these it helps I am trying to convert a vector with 2928 values into a vector with 8784 values. The first vector is a vector with info with an interval of 3hours, and I would like to have an hourly vector with those values added every 3 hours and the remaining should be filled with NaN. My first approach was to create a NaN vector with 8784 values but then I have not been able to create a 'for loop' that worked with this. , Simply index with step different to 1. In this case, step is 3.
code :
B_h(1:3:end) = S_3h
Looping through a vector and finding a maximum sum of values with fixed number of indices

Looping through a vector and finding a maximum sum of values with fixed number of indices


By : sc0
Date : March 29 2020, 07:55 AM
hop of those help? Pretend you have an infinite sequence of numbers, repeating itself. It makes the problem much easier:
code :
fn main() {
    let d = [1, 2, 3, 4, 5, 6, 7, 8];
    let mut numbers = d.iter().cycle();

    let max = (0..d.len())
        .map(|_| {
            let sum1: i32 = numbers.by_ref().take(3).sum();
            let sum2: i32 = numbers.by_ref().take(5).sum();

            // Skip one so the next iteration is offset by one
            numbers.next();

            (sum1, sum2)
        })
        .map(|(sum1, sum2)| i32::abs(3 * sum1 + 5 * sum2))
        .max();

    println!("{:?}", max);
}
find different intervals for a vector of values, making number of values in each interval approximately equal

find different intervals for a vector of values, making number of values in each interval approximately equal


By : user3190399
Date : March 29 2020, 07:55 AM
it helps some times You want the breaks at particular quantiles of your data. For example,
code :
v01 <- runif(1000, 0, 1) 
v12 <- runif(1000, 1, 2)
v25 <- runif(1000, 2, 5)
v <- c(v01, v12, v25)
n <- 3  # Number of intervals
breaks <- quantile(v, (0:n)/n)  # These are the breakpoints.  You might
                                # want to round them to integers, based
                                # on your example
breaks

#           0%    33.33333%    66.66667%         100% 
# 0.0004285758 1.0002311588 1.9999579265 4.9946567267 
Related Posts Related Posts :
  • how to loop for division funciton in r
  • Why does ggplot not allow suppressing of messages generated by its geoms?
  • Download multiple excel files linked through urls in R
  • sparklyr : spark_apply function is not working in cluster mode
  • dplyr mutate - How do I pass one row as a function argument?
  • R selecting rows by conditions given in an external table
  • Native regex way to replace multiple leading chars with equal number spaces
  • stan - difficulty vectorizing
  • How to define a function that calls shiny functions?
  • How to count number of observations in a "n" dimensional range in R
  • Superimposing asymmetric t-distribution using ggplot2
  • Makefile to render all targets of all .Rmd files in directory
  • Authentication failure with rdrop2
  • DT data table display error
  • Issue when adding new rows (with nested dataframes within) to a dataframe
  • R-How to compare two dataframe and update list column value
  • Series vector for approximating pi
  • what is difference between "variance explained " in Random Forest and "merror" in XGBoost
  • R - Cast dataframe on unique rows - reshape2
  • ggplot2: plot correct proportions using geom_bar
  • Speedup query for R data.table - can this two-argument function be applied by group more quickly?
  • apply a function to several columns at once with mutate
  • R 'cowplot' neatly produce gridded plot with shared (common) legends and unique legends
  • Repeat R script for many times and save results to text file
  • How to negative lookbehind for special characters
  • data.table inner join produces error when no match is found
  • Create a new column base on existing column, but row above
  • Is there a way to visualize the process of source() in RStudio?
  • google places api consumes 10 request but I am doing only 1
  • Statistical mode of a categorical variable in R (using mlv)
  • Using for-loop to mutate a data.frame in r
  • Make plot with regression line for mixed model
  • Shortcut to select matces cases in R studio
  • vectoriced norm/matrix multiplication
  • Negative log10 transformation in R
  • Plot data with duplicate points
  • Visualizing crosstab tables with a plot in R - changing colours
  • How to manually modify automated numbers and labels in plot
  • How can I follow any redirections of a url in R?
  • Add jitter to box plot using markers in plotly
  • Adding an extra item to the legend
  • ggplot fills in data in the wrong order
  • Convert list to data frame
  • R: filtering by list(s) of strings and returning all results that start with the content of the lists
  • R:How to attach parts of a data frame with different headers and/or an overflowing piece of the dat frame
  • How to use 'par' for manipulating plot margins?
  • Can dplyr::case_when return mix of NAs and non-NAs?
  • Text preprocessing and topic modelling using text2vec package
  • Uploading multiple files in Shiny, process the files, rbind the results and return a download
  • R levelplot: color green-white-red (white on 0) according to one variable, but show the values of another variable
  • Why [i] doesn't point to the starting point in a vector
  • In R after generating a mvrnorm distribution, Y, what does Y[,1] do?
  • expand a data frame to have as many rows as range of two columns in original row
  • Getting started with R and CFA
  • Re order x-axis in ggplot so time goes from 12AM to 11PM in R
  • R - Automatically stack every nth column of a data frame and save them as new objects
  • How to format dplyr output in R into doubles (or other workable format)?
  • Dataframe to matrix conversion using tapply turns zeros to NAs
  • Smallest multiple of 1:20 - How can I make it quicker?
  • How to specify the size of a graph in ggplot2 independent of axis labels
  • shadow
    Privacy Policy - Terms - Contact Us © voile276.org