frequency

subset based on frequency level [duplicate]

由 情到浓时终转凉″ 提交于 2019-12-06 07:59:32
问题 This question already has answers here : Subset data frame based on number of rows per group (3 answers) Closed 2 years ago . I want to generate a df that selects rows associated with an "ID" that in turn is associated with a variable called cutoff. For this example, I set the cutoff to 9, meaning that I want to select rows in df1 whose ID value is associated with more than 9 rows. The last line of my code generates a df that I don't understand. The correct df would have 24 rows, all with

get most occurring elements in array JavaScript

由 别来无恙 提交于 2019-12-06 07:29:03
I have an array that I want to get the most occurring elements, First scenario let arr1 = ['foo', 'foo', 'foo', 'bar', 'bar', 'bar', 'baz', 'baz'] let newArr = someFunc(arr1) so in this case I want the new array to have the value console.log(newArr) // ['foo', 'bar'] Because the value 'foo' and 'bar' was the most occurring element of the array Second scenario let arr2 = ['foo', 'foo', 'foo', 'bar', 'baz'] let newArr = someFunc(arr2) so in this case I want the new array to have the value console.log(newArr) // ['foo'] Because the value 'foo' was the most occurring element of the array This is

Increase frequency calls of touchesMoved

由 守給你的承諾、 提交于 2019-12-06 07:25:32
问题 Is there a way to increase the frequency calls of touchesMoved than the default? I need more calls of it to draw a smooth circle. It gets called not too frequent by default and so I get an edgy circle. Is there a way to tweek the frequency of touchesMoved calls? Thanks 回答1: I think this is what you are looking for: UIBezierPath It comes with code examples, etc. 来源： https://stackoverflow.com/questions/2702305/increase-frequency-calls-of-touchesmoved

Frequency count of 5 rankings in R

由 。_饼干妹妹 提交于 2019-12-06 06:53:21
Say I have 5 items A, B, C, D, E in a questionnaire and got respondents to rank them. The data looks like this, > df rank1 rank2 rank3 rank4 rank5 1 A B C D E 2 A C B D E 3 C A B E D 4 B A C D E 5 A B D C E How do I count the frequency of each rank by item so the output looks like this, item rank1 rank2 rank3 rank4 rank5 1 A 3 2 0 0 0 2 B 1 2 2 0 0 3 C 1 1 2 1 0 4 D 0 0 1 3 1 5 E 0 0 0 1 4 We can use table after converting to factor using base R lvls <- sort(unique(unlist(df))) sapply(df, function(x) table(factor(x, levels =lvls))) # rank1 rank2 rank3 rank4 rank5 #A 3 2 0 0 0 #B 1 2 2 0 0 #C 1

Counter ngram with tm package in R

由 冷暖自知 提交于 2019-12-06 05:12:05
问题 I created a script for the frequency of words in a document using the object and a dictionary documentTermMatrix in R. The script works on individual words and not on the compound word es. "foo" "bar" "foo bar" This is the code require(tm) my.docs <- c("foo bar word1 word2") myCorpus <- Corpus(VectorSource(my.docs)) inspect(DocumentTermMatrix(myCorpus,list(dictionary = c("foo","bar","foo bar")))) But the result is Terms Docs bar foo foo bar 1 1 1 0 I would have to find one "foo bar" = 1 How

iPhone ultrasound detection (more than 22 kHz)

由 China☆狼群 提交于 2019-12-06 04:20:17
What is the maximum frequency that can detected in iphone 3GS and above? I have been exploring the iPhone audio frequency. I need to detect sound frequency of 22 kHz without any external device. Is it possible ? if the microohone is designed well, it will have an anti-aliasing filter with a roll off beginning slightly below the Nyquist frequency to ensure that energy above the Nyquist is minimal. A sharp Nyquist filter causes ringing of the sound. Thus, if the sampling rate is 44.1, it is likely that the Nyquist filter starts at around 18 kHz, reaching around 40 dB or more attenuation by 22

Sorting entire csv by frequency of occurence in one column

由 自闭症网瘾萝莉.ら 提交于 2019-12-06 02:26:19
问题 I have a large csv file, which is a log of caller data. A short snippet of my file: CompanyName High Priority QualityIssue Customer1 Yes User Customer1 Yes User Customer2 No User Customer3 No Equipment Customer1 No Neither Customer3 No User Customer3 Yes User Customer3 Yes Equipment Customer4 No User I want to sort the entire list by the frequency of occurrence of customers so it will be like: CompanyName High Priority QualityIssue Customer3 No Equipment Customer3 No User Customer3 Yes User

how to use Band Pass filter(18Khz to 22Khz) in Android

由 ☆樱花仙子☆ 提交于 2019-12-06 02:07:53
问题 I need to use Band Pass Filter to filter my real time recording audio. The Range is about 18Khz to 22Khz. I've seen many examples,unfortunatly they are used to detect frequency of audio....Since i'm new to DSP,please ellobrate your answer.... 来源： https://stackoverflow.com/questions/21456630/how-to-use-band-pass-filter18khz-to-22khz-in-android

Android soundpool rate range?

由 女生的网名这么多〃 提交于 2019-12-06 00:29:25
Android's soundpool.play [documentation][1] says " The playback rate allows the application to vary the playback rate (pitch) of the sound. A value of 1.0 means play back at the original frequency. A value of 2.0 means play back twice as fast, and a value of 0.5 means playback at half speed. ". However, when I set the rate to 1.49f, I hear silence. 1.485f renders correctly (it's ogg file). Is this specific to my handset, is the documentation wrong, or am I being foolish in some other way? [1]: http://developer.android.com/reference/android/media/SoundPool.html#play(int , float, float, int, int

How should I implement accurate pitch-detection in Java for Android phones?

由 ☆樱花仙子☆ 提交于 2019-12-05 22:36:45
I want to develop an application that would require accurate pitch-detection for musical instruments through the Android phone's microphone. Most suggestions I read of involve using Fast Fourier Transforms (FFT), but they mentioned it having issues with accuracy and processing power (considering it should run smoothly on a smartphone). One answer suggested a 5Hz error margin, which would be quite noticeable in the low frequency tone range. If the error is logarithmic rather than static in nature, the error margin from each note should be less than 10 Cents (1 Cent=100th root of a semitone, 1
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