frequency

问题 I have a column of firm names in an R dataframe that goes something like this: "ABC Industries" "ABC Enterprises" "123 and 456 Corporation" "XYZ Company" And so on. I'm trying to generate frequency tables of every word that appears in this column, so for example, something like this: Industries 10 Corporation 31 Enterprise 40 ABC 30 XYZ 40 I'm relatively new to R , so I was wondering of a good way to approach this. Should I be splitting the strings and placing every distinct word into a new

问题 This question was migrated from Cross Validated because it can be answered on Stack Overflow. Migrated 5 years ago . I have a frequency table of data in a data.frame in R listing factor levels and counts of successes and failures. I would like to turn it from frequency table into a list of events - i.e. the opposite of the "table" command. Specifically, I would like to turn this: factor.A factor.B success.count fail.count -------- -------- ------------- ---------- 0 1 0 2 1 1 2 1 into this:

问题 This question was migrated from Cross Validated because it can be answered on Stack Overflow. Migrated 5 years ago . I have a frequency table of data in a data.frame in R listing factor levels and counts of successes and failures. I would like to turn it from frequency table into a list of events - i.e. the opposite of the "table" command. Specifically, I would like to turn this: factor.A factor.B success.count fail.count -------- -------- ------------- ---------- 0 1 0 2 1 1 2 1 into this:

问题 I'm trying to write a function to extract the frequencies of this table: 0 1 2 3 4 5 6 7 30 22 9 12 2 5 1 16 So I want to get c(30, 22, 9, 12, 2, 5, 1, 16) . The table changes each time I run the function, so I need something that can extract the information from the table automatically, so I don't have write a c() function each time. 回答1: It honestly could not be any simpler. If you cannot figure this out, you will have lots of other problems: > set.seed(42) ## be reproducible > X <- sample

问题 I'm trying to write a function to extract the frequencies of this table: 0 1 2 3 4 5 6 7 30 22 9 12 2 5 1 16 So I want to get c(30, 22, 9, 12, 2, 5, 1, 16) . The table changes each time I run the function, so I need something that can extract the information from the table automatically, so I don't have write a c() function each time. 回答1: It honestly could not be any simpler. If you cannot figure this out, you will have lots of other problems: > set.seed(42) ## be reproducible > X <- sample

问题 Is it possible to obtain the light frequency of a colour from a RGB representation? I've found the opposite process [1] but I don't know if it's possible this way. [1] http://www.fourmilab.ch/documents/specrend/ 回答1: AFAIK, there is no direct answer because multiple wavelengths can combine to give the same color right? So you have the wavelengths that map to pure colors and then their combinations can give many other and the same colors. And there are several combinations that can give the

问题 I am building an android application that displays the Frequency of a sustained note with the FFT algorithm. I am using Jtransform methods. My issue currently is that I can't display the frequency on screen. The following code is the fft freqency calculation and the AsynchTask which should display the frequency in a text box import edu.emory.mathcs.jtransforms.fft.DoubleFFT_1D; public class Tuning extends Activity implements OnClickListener{ int audioSource = MediaRecorder.AudioSource.MIC; //

问题 I'm trying to develop an Android app that extracts audio frequency from an instrument. I'm using Fast Fourier Transform method with Jtransforms. Here is what I have so far: public class MainActivity extends Activity { @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); new readFrequencies().execute(); } @Override public boolean onCreateOptionsMenu(Menu menu) { // Inflate the menu; this adds items to the

问题 I like to create a table that has the frequency of several columns in my data frame. I am copying part of my data frame below. The table is supposed to have frequency (both n and %) of "red" in Color and "F" in Gender. I think that the dplyr package could do this but I cannot figure it out. Thank you- RespondentID Color Gender 1 1503 Red F 2 1653 NA M 3 1982 Red F 4 4862 Red NA 15 4880 Blue M 回答1: library(dplyr) df %>% count(Color, Gender) %>% group_by(Color) %>% # now required with changes

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 5 years ago . I am currently working on my fourth year project (computer science) which involves the automatic transcription of music -> sheet music. I am doing it in Matlab at the moment but will have to be converted to java at some stage. My problem: I have my program returning the correct