frequency

问题 What is a good way to get the independent frequency counts of multiple columns using dplyr ? I want to go from a table of values: # A tibble: 7 x 4 a b c d <int> <int> <int> <int> 1 1 2 1 3 2 1 2 1 3 3 2 2 5 3 4 3 2 4 3 5 3 3 2 3 6 5 3 4 3 7 5 4 2 1 to a frequency table like so: # A tibble: 5 x 5 x a_n b_n c_n d_n <int> <int> <int> <int> <int> 1 1 2 0 2 1 2 2 1 4 2 0 3 3 2 2 0 6 4 4 0 1 2 0 5 5 2 0 1 0 I'm still trying to get my head around dplyr , but it seems like this is something it could

问题 I'm new with R. I need to generate a simple Frequency Table (as in books) with cumulative frequency and relative frequency. So I want to generate from some simple data like > x [1] 17 17 17 17 17 17 17 17 16 16 16 16 16 18 18 18 10 12 17 17 17 17 17 17 17 17 16 16 16 16 16 18 18 18 10 [36] 12 15 19 20 22 20 19 19 19 a table like: frequency cumulative relative (9.99,11.7] 2 2 0.04545455 (11.7,13.4] 2 4 0.04545455 (13.4,15.1] 1 5 0.02272727 (15.1,16.9] 10 15 0.22727273 (16.9,18.6] 22 37 0

问题 I can get the levels and frequencies of a categorical variable using table() function. But I need to feed the most frequent level into calculations later. How can I do that? for example, I want to get "191" from categorical variable a. > table(a) a 19 71 98 139 146 185 191 305 75 179 744 1 1980 6760 回答1: a <- sample(x = c(19, 71, 98, 139, 146, 185, 191), size = 1000, replace = TRUE) tt <- table(a) names(tt[which.max(tt)]) 回答2: ll<-data.frame(table(a)) ll[which.max(ll$Freq),] Example from

问题 Can somebody help me to run this program using c#. This program is to calculate the frequency of the number, for example 12 appear 10x. Before this I try to sort all list number in a horizontal line. Then I compare the same number, then count++, but until know I can’t get the output. Thanks for helping. INPUT 46 31 46 9 25 12 45 33 25 12 12 12 28 36 38 28 25 12 12 9 36 38 36 36 12 9 36 12 12 25 28 34 36 36 9 12 16 25 28 44 OUTPUT 9 – 4 12 -10 16 – 1 25 – 5 28 - 4 31 – 1 33 – 1 34 - 1 36 – 7

问题 I have data from a sensor and I need to find the frequency of it. It looks like fft() seems to be the way to go, but the MATLAB docs only show how to get a graph of the frequencies, I don't know what to do from there. Here's what my data looks like: 回答1: One way to go is indeed to use an fft. Since the fft gives you the frequency representation of the signal, you want to look for the maximum, and since the fft is a complex signal, you will want to take the absolute value first. The index will

问题 I'm trying to display frequencies within barplot ... well, I want them somewhere in the graph: under the bars, within bars, above bars or in the legend area. And I recall (I may be wrong) that it can be done in ggplot2 . This is probably an easy one... at least it seems easy. Here's the code: p <- ggplot(mtcars) p + aes(factor(cyl)) + geom_bar() Is there any chance that I can get frequencies embedded in the graph? 回答1: geom_text is tha analog of text from base graphics: p + geom_bar() + stat

问题 Closed . This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 11 months ago . There's this tech-festival in IIT-Bombay, India, where they're having an event called "Artbots" where we're supposed to design artbots with artistic abilities. I had an idea about a musical robot which takes a song as input, detects the notes in the song and plays it back on a

问题 It's been asked a lot, but I still stuck about implement FFT class on Android I need to process my audio data using FFT... I already read the almost same question here How can I get frequency data from PCM using FFT and here How to get frequency from fft result? and more questions but still find no answer even after I tried the answers given... FFT Class I'm using: http://www.cs.princeton.edu/introcs/97data/FFT.java The complex class to go with it: http://introcs.cs.princeton.edu/java/97data

问题 I have a .txt file that looks something like this: rs1 NC AB NC rs2 AB NC AA rs3 NC NC NC ... For each row, I would like to count the frequencies of "NC", so that my output will be something like below: rs1 2 rs2 1 rs3 3 ... Can someone tell me how to do this in R or in Linux? Many thanks! 回答1: df$count <- rowSums(df[-1] == "NC") # V1 V2 V3 V4 count # 1 rs1 NC AB NC 2 # 2 rs2 AB NC AA 1 # 3 rs3 NC NC NC 3 We can use rowSums on the matrix that is created from this expression df[-1] == "NC" .

问题 I am using Python 3.3 I need to create two lists, one for the unique words and the other for the frequencies of the word. I have to sort the unique word list based on the frequencies list so that the word with the highest frequency is first in the list. I have the design in text but am uncertain how to implement it in Python. The methods I have found so far use either Counter or dictionaries which we have not learned. I have already created the list from the file containing all the words but