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Answer by Sinan Kurmus for Count and summation of positive and negative...
A simple python answer, ignores the 0 case:x = [-0.01, 0.003, -0.002, 0.018, 0.002, 0.006, -0.012, 0.014, -0.017, -0.007, 0.002, 0.002, -0.004, 0.015, 0.002, -0.001, -0.008, 0.01, -0.018, 0.046]count =...
View ArticleAnswer by RogB for Count and summation of positive and negative number sequences
I think a loop would be easier to read, but just for fun, here's a solution in Python using recursion:x = [-0.01, 0.003, -0.002, 0.018, 0.002, 0.006, -0.012, 0.014, -0.017, -0.007, 0.002, 0.002,...
View ArticleAnswer by lotus for Count and summation of positive and negative number...
Here's another base R approach:data.frame(x, n = sequence(rle(sign(x))$lengths), sum = Reduce(function(x, y) if (sign(x) == sign(y)) x + y else y, x, accumulate = TRUE)) x n sum1 -0.010 1 -0.0102 0.003...
View ArticleAnswer by Adverse_Event for Count and summation of positive and negative...
Throwing my [r] answer in the hat, optimized for speed and works with any length of x (unlike the asker's which was hard coded for length 20):### data set.seed(100)x <- round(rnorm(20, sd = 0.02),...
View ArticleAnswer by MKa for Count and summation of positive and negative number sequences
In R, you could also do:# DATAset.seed(100)x <- round(rnorm(20, sd = 0.02), 3)library(data.table)dt <- data.table(x = x)# Create Positive or Negative variabledt$x_logical <- ifelse(dt$x >...
View ArticleAnswer by GoGonzo for Count and summation of positive and negative number...
I recommend R package runner for this kind of operations.streak_run calculates consecutive occurrence of the same value, and sum_run calculates sum in window which length is defined by k argument.Here...
View ArticleAnswer by user5538922 for Count and summation of positive and negative number...
The other solutions look okay but you don't really need to use sophisticated language features or library functions for this simple problem.result, prev = [], Nonefor idx, cur in enumerate(x): if not...
View ArticleAnswer by Prodipta Ghosh for Count and summation of positive and negative...
In Python, apart from defining a class to store the memory variables, you can use a closure to achieve the same.def run(): count = 0 last_sign = 0 def sign(i): return 1 if i > 0 else -1 def f(i):...
View ArticleAnswer by schot for Count and summation of positive and negative number...
Two different lazy solutions in Python, using the itertools module.Using itertools.groupby (and accumulate)from itertools import accumulate, groupbyresult = ( item for _, group in groupby(x, key=lambda...
View ArticleAnswer by Walter Tross for Count and summation of positive and negative...
As for Python, someone will come up with a solution using the pandas library. In the meantime, here is a simple proposal:class Combiner: def __init__(self): self.index = self.seq_index = self.summation...
View ArticleAnswer by Andrew Gustar for Count and summation of positive and negative...
Here is a simple tidyverse solution...library(tidyverse) #or just dplyr and tidyrset.seed(100)x <- round(rnorm(20, sd = 0.02), 3)df <- tibble(x = x) %>% mutate(seqno = cumsum(c(1,...
View ArticleAnswer by Allan Cameron for Count and summation of positive and negative...
Here's a simple non-looping function in R:count_and_sum <- function(x){ runs <- rle((x > 0) * 1)$lengths groups <- split(x, rep(1:length(runs), runs)) output <- function(group)...
View ArticleAnswer by Ameer for Count and summation of positive and negative number...
You can calculate the run lengths of each sign using rle from base to and do something like this. set.seed(0)z <- round(rnorm(20, sd = 0.02), 3)run_lengths <- rle(sign(z))$lengthsrun_lengths# [1]...
View ArticleAnswer by Ronak Shah for Count and summation of positive and negative number...
In R, you can use data.tables rleid to create groups with positive and negative series of number and then create a sequence of rows in each group and do a cumulative sum of the x values....
View ArticleCount and summation of positive and negative number sequences
I want to write a code to count and sum any positive and negative series of numbers.Numbers are either positive or negative(no zero).I have written codes with for loops. Is there any creative...
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