Transforming vertical Data to a horizontal format in R -


this conceptual question. have data in sql express database loading r via odbc package. data format is:

name, symbol, number of days 1/1/2015, closing price. 

the main company, tmc, 1, 12 xyz company, xyz, 1, 233 1 company, toc, 1, 56 2 company, ttc, 1, 88  main company,tmc, 2, 11.5 xyz company, xyz, 2, 232 1 company, toc, 2, 59 2 company, ttc, 2, 89

my question is: there r package can transform data being in vertical format horizontal? ie

name, symbol, price lag1, price lag2

the main company, tmc, 12, 11.5 xyz company, xyz, 233, 232 1 company, toc, 56,59 2 company, ttc, 88,89

or should try sql code?

we use dcast reshape2 or spread tidyr. before reshaping, may better change lengthy column names spaces no space column names. specify value column in value.var in dcast.

library(reshape2) colnames(df1)[3:4] <- c('numberofdays', 'closing_price') dcast(df1, name+symbol~paste0('lag', numberofdays),                    value.var='closing_price') #              name symbol lag1  lag2 #1 main company    tmc   12  11.5 #2  1 company    toc   56  59.0 #3  2 company    ttc   88  89.0 #4  xyz company    xyz  233 232.0

a similar option using dplyr/tidyr mutate 'numberofdays' pasteing 'lag' string , convert 'long' format 'wide' `spread.

library(dplyr) library(tidyr) df1 %>%     mutate(numberofdays=paste0('lag', numberofdays)) %>%     spread(numberofdays, closing_price)

-

Comments

Post a Comment

Popular posts from this blog

c# - Binding a comma separated list to a List<int> in asp.net web api -

the default binder in web api expecst http://url.com/webapi/report/?pageids=3243&pageids=2365 to bind public ihttpactionresult report(list<int> pageids){ // exciting webapi code} i wish bind http://url.com/webapi/report/?pageids=3243,2365 as running out of space in url get . i have created class public class commaseparatedmodelbinder : system.web.http.modelbinding.imodelbinder { public bool bindmodel(httpactioncontext actioncontext, modelbindingcontext bindingcontext) { //binding in here } } and registered in webapiconfig.cs var provider = new simplemodelbinderprovider( typeof(list<int>), new commaseparatedmodelbinder()); config.services.insert(typeof(modelbinderprovider), 0, provider); i have altered method signature use model binder so public ihttpactionresult report( [modelbinder] list<int> pageids){ // exciting webapi code} however break point in binder not being
Read more

Delphi 7 and decode UTF-8 base64 -

in delphi 7, have widestring encoded base64(that received web service widestring result) : pd94bwwgdmvyc2lvbj0ims4wij8+dqo8c3ryaw5nptiq2lpyqjwvc3ryaw5npg== when decoded it, result not utf-8: <?xml version="1.0"?> <string>طھط³طھ</string> but when decoded base64decode.org, result true : <?xml version="1.0"?> <string>تست</string> i have use encddecd unit decodestring function. the problem have using decodestring . function, in delphi 7, treats decoded binary data being ansi encoded. , problem text utf-8 encoded. to continue encddecd unit have couple of options. can switch decodestream . instance, code produce utf-8 encoded text file data: {$apptype console} uses classes, encddecd; const data = 'pd94bwwgdmvyc2lvbj0ims4wij8+dqo8c3ryaw5nptiq2lpyqjwvc3ryaw5npg=='; var input: tstringstream; output: tfilestream; begin input := tstringstream.create(data); try output := tfilestream.
Read more

html - Is there any way to exclude a single element from the style? (Bootstrap) -

so, have img logo, overlaid on div styled background-image: url("...") , , both elements inside 2 div classes .to-color , .to-overlay respectively, black transparent overlay. is there way exclude logo style given these 2 classes? here's jsfiddle example: link html , css example: - html - <div class="to-color"> <div class="to-overlay"> <div class="respo"> <div class="row"> <div class="col-xs-4 col-xs-offset-4 text-center"> <img src="http://ansonalex.com/wp-content/uploads/2011/06/google-logo-768x260.png" alt="..." class="img-responsive"> </div> </div> </div> </div> </div> - css - .to-color { background-color: #000; } .to-overlay { opacity : 0.5; } .respo { background-image: url("https://source.unsplash.com/category/objects/1600x900"); background-position: center center;
Read more