apply - MAPPLY across a vector in R -

-

i've seen several examples on google, still don't understand quite how works

here's i'm trying do.

i have text array 

> v <- c("aa","bb","cc","dd","ee","ff") > v [1] "aa" "bb" "cc" "dd" "ee" "ff"

i output array of length length(v)-2 (=4) composed of

[1] "aabbcc" "bbccdd" "ccddee" "ddeeff"

which vector concatenations of 3 successive elements of v

i'm thinking of using mapply

mapply(function(x,i){paste(x[i:i+2],sep="",collapse="")},v,1:(length(v)-2))

but thats not right syntax

thanks

here's solution in case project needs many successive elements. there other approaches, mapply one:

mapply(function(x,y) paste(v[x:y], collapse=""), 1:(length(v)-2), 3:length(v)) #[1] "aabbcc" "bbccdd" "ccddee" "ddeeff"

as per comments, can create function , use lapply list:

paste2 <- function(vec, n=3) {   mapply(function(x,y) paste(vec[x:y], collapse=""), 1:(length(vec)-(n-1)), n:length(vec)) }  ## single vector still works paste2(v) #[1] "aabbcc" "bbccdd" "ccddee" "ddeeff"  ## list lst <- rep(list(v), 2) lapply(lst, paste2) #[[1]] #[1] "aabbcc" "bbccdd" "ccddee" "ddeeff" # #[[2]] #[1] "aabbcc" "bbccdd" "ccddee" "ddeeff"

Comments

Post a Comment

Popular posts from this blog

How to show in django cms breadcrumbs full path? -

-
need advice - how show in breadcrumbs whole path article or page? i've got code: {% ance in ancestors %} <li> {% if not forloop.last %} <a href="{{ ance.get_absolute_url }}">{{ ance.get_menu_title }}</a> {% else %} <span class="active">{{ ance.get_menu_title }}</span> {% endif %} </li> {% endfor %} but shows "home" , current page. how modify show whole path in breadcrumbs? i've found in file menu_tags.py code calls ancestors. @ least there class showbreadcrumbs: class showbreadcrumb(inclusiontag): """ shows breadcrumb node has same url current request - start level: after level should breadcrumb start? 0=home - template: template used render breadcrumb """ name = 'show_breadcrumb' template = 'menu/dummy.html' options = options( argument('start_level', default=0, require...
Read more

php - Invalid Cofiguration - yii\base\InvalidConfigException - Yii2 -

-
Image
i've installed yii2-user module/dektrium yii2-app-basic application command composer require "dektrium/yii2-user:0.9.*@dev" config/console.php return [ . . 'modules' => [ 'gii' => 'yii\gii\module', 'user' => [ 'class' => 'dektrium\user\module', ], ], . . ] config/web.php 'components' => [ . . /* 'user' => [ 'identityclass' => 'app\models\user', 'enableautologin' => true, ], */ 'modules' => [ 'user' => [ 'class' => 'dektrium\user\module', ], ], . . ] after that, run command $ php yii migrate/up --migrationpath=@vendor/dektrium/yii2-user/migrations updating database schema . but, when run http://localhost/mylawsuit/yii/web/index.php?r=u...
Read more

ruby on rails - npm error: tunneling socket could not be established, cause=connect ETIMEDOUT -

-
i have app uses rails framework , implements angularjs part of front end. i have pushed heroku , have heroku toolbelt installed, when try migrate db using "heroku run rake db:migrate" receive following error(s): installing core plugins heroku-cli-addons, heroku-apps, heroku-fork, heroku-git, heroku-local, heroku-run, heroku-status... error installing package. try running again gode_debug=info see more output. ! `run` not heroku command. ! perhaps meant `-h`, `2fa`, `auth`, `join`, `open`, `orgs`, `pg`, `ps` or `rake`. ! see `heroku help` list of available commands. i run command "gode_debug=info heroku run rake db:migrate" , receive error: npm err! darwin 14.5.0 npm err! argv "/users/christopher_pelnar/.heroku/node-v4.2.1-darwin-x64/bin/node" "/users/christopher_pelnar/.heroku/node-v4.2.1-darwin-x64/lib/node_modules/npm/cli.js" "install" "heroku-cli-addons" "heroku-apps" "heroku-fork...
Read more