frequency-distribution | 易学教程

Finding frequency distribution of a list of numbers in python

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问题 I have a Long list of numbers like the following. I would like to find frequency distribution of each number, but I could not use Counter function to get frequency of each item, as they are integers and I get the error that it is not iterable , and therefore I could not convert the list to strings. I checked the similar questions but they did not work for me. data=[1.0, 2.0, 1.0, 1.0, 1.0, 0.0, 0.0, 0.0, 15.0, 0.0, 0.0, 0.0, 0.0, 3.0, 1.0, 1.0, 1.0, 0.0, 0.0, 1.0, 7.0, 1.0, 0.0, 0.0, 4.0, 3.0

Plotting frequency spectrum with c++

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问题 Please see the Edits in the answer below this question. I have written a script to plot the frequency spectrum of a sinusoidal signal with c++. Here are the steps Applying Hanning window Apply FFT using fftw3 library I have three graphs: Signal, Signal when is multiplied to Hanning function, and the frequency spectrum. The frequency spectrum looks wrong. It should have a peak at 50 Hz. Any suggestion would be appreciated. Here is the code: #include <stdlib.h> #include <stdio.h> #include <time

r element frequency and column name

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问题 I have a dataframe that has four columns A, B, C and D: A B C D a a b c b c x e c d y a d z e f I would like to get the frequency of all elements and lists of columns they appear, ordered by the frequency ranking. The output would be something like this: Ranking frequency column a 1 3 A, B, D c 1 3 A, B, D b 2 2 A, C d 2 2 A, B e 2 2 A, D f ..... I would appreciate any help. Thank you! 回答1: Something like this maybe: Data df <- read.table(header=T, text='A B C D a a b c b c x e c d y a d NA

NetLogo: histogram relative frequency

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问题 I'm still having problems with [histogram] . I have a global variable (age-sick) that stores the age of the turtles when they got sick...and I want to plot the distribution: histogram age-sick However I do not want the absolute number of turtles who got sick per every age, rather the relative one . Is there a way to do so? 回答1: I have tried to overcome the problem in the following way: let age-freq (list) let i 0 while [ i <= (max age-sick)] [ let a filter [? = i] age-sick repeat (length a

How to find all values which only appear less than X times in a vector

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问题 I have a vector, in this case a character vector. I want all the elements which only appear once in the vector, but the solution should be generalizable for limits other than 1. I can pick them manually if I use the table function. I thought that the solution would look something like frequencies <- table(myVector) myVector[??@frequencies <= 1] But first of all, I don't know the slot name which will have to go into ??, and searches for documentation on the table object lead me to nowhere.

Frequency and cumulative frequency curve on the same graph in R

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问题 Is there a way (in R with ggplot or otherwise) to draw frequency and cumulative frequency curves in a single column (two rows) i.e. one top of the other such that a given quartile can be shown on both the curves using straight lines? I hope I am clear on this.. You may use this data.. mydata<-structure(list(speed = c(10, 15, 20, 25, 30, 35, 40, 45, 50),frequency = c(0, 1, 5, 10, 20, 10, 6, 3, 0)), .Names = c("speed","frequency"), row.names = c(NA, -9L), class = "data.frame") 回答1: mydata<

Sorting frequency of chars

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问题 I just made an algorithm that counts the frequency of chars in a String. What I am confused about is how to sort the frequency so the character with the greatest number of occurences is listed at the top, and the least at the bottom. At first I tried having another variable 'fc' (for frequency counter) to coincide with my original counter variable 'k'. However I am stuck in the thought process of how to go about sorting this frequency, the fc var I made is just useless. Thanks for any help

How to compute letter frequency in a string using pythons built-in map and reduce functions

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问题 I would like to compute the frequency of letters in a string using pythons map and reduce built-in functions. Could anyone offer some insight into how I might do this? What I've got so far: s = "the quick brown fox jumped over the lazy dog" # Map function m = lambda x: (x,1) # Reduce # Add the two frequencies if they are the same # else.... Not sure how to put both back in the list # in the case where they are not the same. r = lambda x,y: (x[0], x[1] + y[1]) if x[0] == y[0] else ???? freq =

Frequency and cumulative frequency curve on the same graph in R

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Is there a way (in R with ggplot or otherwise) to draw frequency and cumulative frequency curves in a single column (two rows) i.e. one top of the other such that a given quartile can be shown on both the curves using straight lines? I hope I am clear on this.. You may use this data.. mydata<-structure(list(speed = c(10, 15, 20, 25, 30, 35, 40, 45, 50),frequency = c(0, 1, 5, 10, 20, 10, 6, 3, 0)), .Names = c("speed","frequency"), row.names = c(NA, -9L), class = "data.frame") mydata<-structure(list(speed = c(10, 15, 20, 25, 30, 35, 40, 45, 50),frequency = c(0, 1, 5, 10, 20, 10, 6, 3, 0)),

How to compute letter frequency in a string using pythons built-in map and reduce functions

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I would like to compute the frequency of letters in a string using pythons map and reduce built-in functions. Could anyone offer some insight into how I might do this? What I've got so far: s = "the quick brown fox jumped over the lazy dog" # Map function m = lambda x: (x,1) # Reduce # Add the two frequencies if they are the same # else.... Not sure how to put both back in the list # in the case where they are not the same. r = lambda x,y: (x[0], x[1] + y[1]) if x[0] == y[0] else ???? freq = reduce(r, map(m, s)) This works great when all the letters are the same. >>> s 'aaaaaaa' >>> map(m, s)