find-occurrences

I have been working on trying to figure out this algorithm for about 6 hours now and can't seem to come up with a solution. I am trying to count the occurrences of elements inside an array and may two more separate arrays. One for the unique instances, and one for how many times these instances occurs. I found some other thinks on here about array lists and hashMaps, but I am only able to use arrays. For example, I have this array (already sorted): {cats, cats, cats, dog, dog, fish} I am trying to get make an array for the instances, so: {cats, dog, fish} And finally, how many times these

I have a large data-frame (approx 1,000 rows and 30,000 columns) that looks like this: chr pos sample1 sample2 sample3 sample 4 1 5050 1 NA 0 0.5 1 6300 1 0 0.5 1 1 7825 1 0 0.5 1 1 8200 0.5 0.5 0 1 where at a given "chr"&"pos" the value for a given sample can take the form of 0, 0.5, 1, or NA. I have a large number of queries to perform that will require subsetting and ordering the data frame based on summaries of the values for each sample. I would like to get a count of the number of occurrences of a given value (e.g. 0.5) for each column, and save that as a new row in my data frame. My

I have a list of lists like : names = [['cat', 'fish'], ['cat'], ['fish', 'dog', 'cat'], ['cat', 'bird', 'fish'], ['fish', 'bird']] I want to count number of times that each pair of names mentioned together in the whole list and the output would be like: { ['cat', 'fish']: 3, ['cat', 'dog']: 1,['cat','bird']:1 ['fish','dog'] : 1, ['fish','bird']:2} I tried : from collections import Counter from collections import defaultdict co_occurences = defaultdict(Counter) for tags in names: for key in tags: co_occurences[key].update(tags) print co_occurences but it doesn't count co=occurrences in the

This question already has an answer here : Definitive List of Common Reasons for Segmentation Faults (1 answer) Closed 2 years ago . I want the main returns the position of the occurrences of "mdl" in "dati". I set up the "schema" function to find the starting point of each occurrence, but when i run the program from the command line, it returns: Segmentation fault: 11 I don't know how to fix the problem. Here's the code: #include <stdio.h> #include <stdlib.h> #include <string.h> #include <math.h> int schema(int testo[], int nT, int modello[], int nM, int primo) { int i, j, k; static int r[12]