frequency

问题 I've compiled a corpus of tweets sent over the past few months or so, which looks something like this (the actual corpus has a lot more columns and obviously a lot more rows, but you get the idea) id when time day month year handle what UK1.1 Sat Feb 20 2016 12:34:02 20 2 2016 dave Great goal by #lfc UK1.2 Sat Feb 20 2016 15:12:42 20 2 2016 john Can't wait for the weekend UK1.3 Sat Mar 01 2016 12:09:21 1 3 2016 smith Generic boring tweet Now what I'd like to do in R is, using grep for string

问题 In the match_letters function, with 'place = string.index(letter)' i keep recieving the same error of 'Value Error: tuple.index(x): x not a tuple.' Does anyone know how to solve this? It will be much appreciated :) Thanks def freq_analysis(): """ Summary: Perform a frequency analysis on a string Paramaters: text - The text to analyse Returns: A string containing the deciphered text """ text = input("enter text") letterCount = getLetterCount(text) Letter_Count_Tuple,new_letter_count,descending

问题 In the match_letters function, with 'place = string.index(letter)' i keep recieving the same error of 'Value Error: tuple.index(x): x not a tuple.' Does anyone know how to solve this? It will be much appreciated :) Thanks def freq_analysis(): """ Summary: Perform a frequency analysis on a string Paramaters: text - The text to analyse Returns: A string containing the deciphered text """ text = input("enter text") letterCount = getLetterCount(text) Letter_Count_Tuple,new_letter_count,descending

问题 First off, I've already read the following thread: ggplot2 - Multi-group histogram with in-group proportions rather than frequency I followed the ddply suggestion and it didn't seem to work for my data. Logically the code should work perfectly on my dataset and I have no idea what I'm doing wrong. Overall: I'd like to make a histogram (I'm learning ggplot) that displays the genotype frequency in each of my study groups. Something like this: Here's a mock data set that mirrors my own: df<-data

问题 I found a code about image rotation in frequency domain. But I couldn't understand this code. This code works correct. Can anyone describe this code? Actually I have to write a code to rotate an image in frequency domain in polar coordinates. Do you think this code meet the requirements. clear; img=imread('cameraman.tif'); imshow(img); title('original image'); theta=26,5; N=size(img,1); M=size(img,2); fimg=fftshift(fft2(fftshift(img))); p=ones(N,1)*[-N/2:(N-1)/2]; % horizontal axis q=-p'; %

问题 I would like to get a table of top 10 absolute and relative frequencies for a variable across other factor variable. I have a dataframe with 3 columns: 1 column is a factor variable, 2nd is other variable I need to count, 3 is logical variable as a constraint. (real database has more than 4mln observations) dtf<-data.frame(c("a","a","b","c","b"),c("aaa","bbb","aaa","aaa","bbb"),c(TRUE,FALSE,TRUE,TRUE,TRUE)) colnames(dtf)<-c("factor","var","log") dtf factor var log 1 a aaa TRUE 2 a bbb FALSE 3

问题 When I am using jTransform. https://sites.google.com/site/piotrwendykier/software/jtransforms with my app to perform FFT to my pcm data, I got the exception java.lang.NoClassDefFoundError: edu.emory.mathcs.jtransforms.fft.DoubleFFt_1D while I added the jtransform.jar in my app.And also update the build path. 回答1: 1.In Project properties -> Java build path -> Order and export, check all your added dependencies to be included with project class files. 2.Select Android Tools > Fix Project

问题 Can the windows phone 7 in-built microphone detect frequencies higher than 18kHz? 回答1: Technically yes, the API supports recording PCM with sufficient quality to express a 18kHz sine wave. Standard POTS lines and even T1 lines generally operate at 8 kHz 16 bit which is mathematically enough to correctly record a max of 4 kHz. And since the mic isn't usually used for anything higher quality than telephony audio, I bet the limiting factor will be the hardware... your mileage will definitely

问题 I'm trying to come up with a method for calculating frequency of an action, to be more specific, mouse clicks. This is what I have in my head (im not the best a maths or explaining but I'll try). I expect a user to be able to reach an average click frequency of 10 clicks per second and I want to know what percentage of that target was achieved per 1 10th of a second. I am nearly there... I think but because I set the mouse clicks back down to 0, the frequency drops straight down instead of

问题 This is my second question because i hawe a problem. I've to implement a simple Frequency detection on Android. For the DFT i've found the jTransform library (https://sites.google.com/site/piotrwendykier/software/jtransforms). In the API of jTransform http://incanter.org/docs/parallelcolt/api/edu/emory/mathcs/jtransforms/fft/DoubleFFT_1D.html#complexForward%28double%5B%5D%29 i had seen that i've to pass a double vector at the complexForward() method, and obliviously not a File. So, for first,