R - Extract & count all unique 2- and 3-place subsets of strings -


i have column in dataframe contains sequences (of uneven length 1 row next) composed of 0, 1, 2. (the strings don't need numeric; represent degrees of stress in syllables on whole sentences.) minimal (very simplified) example: 

> df     b foo   0100101 bar   01201

what need dataframe provides every 2- or 3-place combination within column (numbers can occur themselves, e.g. 00) , total count of each combination on whole dataframe. (a count each row nice, too, fear take reshaping, , it's not goal right now.) abbreviated desired result:

> output combo     count 00        1 01        5 10        2     ... 001       1 010       2     ...

and on. i've tried numerous variations on str_count without success.

1

get 2 or 3 element combination strings in df$b , use table count frequency

table(unlist(lapply(c(2, 3),                 function(i) lapply(df$b,                                 function(x) sapply(1:(nchar(x) - (i - 1)),                                                 function(j) substr(x, j, j + - 1))))))  # 00 001  01 010 012  10 100 101  12 120  20 201  #  1   1   5   2   1   2   1   1   1   1   1   1

2

use expand.grid combinations of 2 , 3 elements 0, 1, , 2. then, use gregexpr count occurrences in df$b

sapply(c(do.call(paste0, (expand.grid(0:2, 0:2))),          do.call(paste0, (expand.grid(0:2, 0:2, 0:2)))),        function(x){            temp = unlist(gregexpr(pattern = x, text = df$b))            length(temp[temp != -1])        }) # 00  10  20  01  11  21  02  12  22 000 100 200 010 110 210 020 120 220 001  #  1   2   1   5   0   0   0   1   0   0   1   0   2   0   0   0   1   0   1  #101 201 011 111 211 021 121 221 002 102 202 012 112 212 022 122 222  #  1   1   0   0   0   0   0   0   0   0   0   1   0   0   0   0   0

data

df = structure(list(a = c("foo", "bar"), b = c("0100101", "01201")), .names = c("a",  "b"), row.names = c(na, -2l), class = "data.frame")

Comments

Post a Comment

Popular posts from this blog

node.js - Node js - Trying to send POST request, but it is not loading javascript content -

i have been trying send post request website, , has not been loading full site. i guessing problem node js not loading javascript content, executing it. can see javascript in response, though never loads content javascript files producing in html. what mean is, doesn't execute javascript. how make node js code overcome this, , wait the full website load? have tried native code, , "request' module, both producing same errors. if helps, don't need native javascript. modules fine. some code have tried (request module): var options = { method: 'post', uri: 'https://url', formdata: { 'email': 'email', 'prize': '0', 'transactional': 'on' }, headers: { /* 'content-type': 'application/x-www-form-urlencoded' */ // set automatically } }; rp(options) .then(function (body) { console.log(body) }) .catch(function (err) { console.log(err) }); when fetch content...
Read more

javascript - Replicate keyboard event with html button -

i have tried few ways make happen. have javascript pinball game uses keyboard keys controls. converting application touch screen display. workaround, hoping overlay buttons when clicked simulate keyboard strokes. have done research , sounds should work. using jquery v3.2.1 here things have tried far... html element: <input type="button" class="coil"></input> $('.coil').trigger({type: 'keydown', which: 40, keycode: 40}); with this, not errors, nothing happens. var coilkey = $('body').keydown(function(e) { switch (e.keycode) { case 40: break;} }) $('.coil').click(coilkey); this 1 returns error in console... ((jquery.event.special[handleobj.origtype] || (intermediate value)).handle || handleobj.handler).apply not function below javascript game engine handles key listeners... addkeylistener: function (keyandlistener) { this.keylisteners.push(keyandlistener); }, // gi...
Read more

javascript - Web audio api 5.1 surround example not working in firefox -

i've been playing lott lately web audio api on both firefox , chrome. few days ago started experiment surround set. when trying surround audio in web audio api came notice example works fine in chrome v59 not in firefox v54. // create web audio api context var audioctx = new (window.audiocontext || window.webkitaudiocontext)(); audioctx.destination.channelinterpretation = 'discrete'; audioctx.destination.channelcountmode = 'explicit'; audioctx.destination.channelcount = 6; var oscillators = []; var merger = audioctx.createchannelmerger(6); console.log(audioctx.destination, merger); //merger.channelinterpretation = 'discrete'; //merger.channelcountmode = 'explicit'; //merger.channelcount = 6; var addoscilator = function(channel, frequency) { var oscillator = audioctx.createoscillator(); oscillator.frequency.value = frequency; // value in hertz oscillator.connect(merger,0,channel); oscillator.start(); oscillators.push(o...
Read more