In the following dataset, I want to computer the function decostand every 72 rows. Do this 10 times. Here is what I tried. library(vegan) library(truncnorm) df <- data.frame(set = rep(c(1:10), each = 72), sp1 = rep(rtruncnorm(72, a=0, b=800, mean = 50, sd = 20), times = 10), sp2 = rep(rtruncnorm(72, a=0, b=800, mean = 70,… Read More How to run a simple for loop with a function within in R?

I have some issues to read a nested data structure from .json file via list comprehension. This is my file: "persons": [ { "A": [ { "type": "type1", "value": "", "is_valid": true }, { "type": "type1", "value": "", "is_valid": true } ] }, { "B": [ { "type": "type2", "value": "", "is_valid": true } ]… Read More List comprehension from JSON file with several items in list

I was given range n and number k. Count the possible ways so that two (not identical) number in that range add up to number k. And can this be done without nested loops? Here’s my approach, the only thing is I’m using a nested loop, which takes times and not computer-friendly. Opposite pairs like… Read More All possible way of adding up number in a sequence so that it becomes a given number

I understand that loops are an integral part of any programming language. They help us to iterate tasks that are repetitive. But I don’t seem to understand why these 2 loops are required seperately. Can’t just one of them do the job? I have tried both loops and still can’t seem to understand how are… Read More What's the exact distinction between the FOR loop and the WHILE Loop

I have data that logs subject and session information in columns like so: > Subject <- c(rep("A", 6), rep("B", 7)) > Session <- c(rep(1, 3), rep(2, 3), rep(8, 4), rep(9, 3)) > df <- data.frame(Subject, Session) > df Subject Session 1 A 1 2 A 1 3 A 1 4 A 2 5 A 2… Read More How to reset a sequence in a R dataframe's column, based on the levels of a different column

I have tried to switch values, numbers, variables, everything, and nothing seems to work. I am still quite new to arrays so I apologize if its a simple fix. The nested loop is supposed to find the smallest value in the array and then return it to the main method, however, everytime I just get… Read More When I run my for-loop, the returned value is not the correct array value

I have two arrays in my C++ code. array1 has all elements but array2 has the same elements but with a few missing. I am trying to find out the elements that are missing in array2. Instead of showing the missing elements, it is showing elements which are also present in both the arrays and… Read More Compare string array1 with string array2 and return entries that are not present in array2

I am trying make a nested loop so a while loop gets repeated n times. An object is supposed to drive a distance in i steps for n repetitions. Axis and speed are irrelevant for the loop. What I don’t understand is why the first i in i = i + 1 is not used,… Read More Nested loop provides unwanted action

I’m relatively new to C/C++, and I’m learning about nested for loops and arrays. The question I’m asking is referring to the code below int main(){ int N, M; bool secret = false; scanf("%d %d", &N, &M); //N is the amount of weapon "The Hero" has, while M is the amount for "The Villain" int… Read More Using two arrays as an if condition in a nested for loop

I have this code. n_nodes = len(data_x) X = np.zeros((n_nodes, n_nodes)) for i in range(n_nodes): for j in range(n_nodes): X[i, j] = data_x[i] ** j I want to do the same task with no loops used at all. How can I do that with NumPy functions? >Solution : If data_x is big, you will be… Read More How to avoid nested for loops in NumPy?