I'm trying to apply a function defined in the VW R docs, that attemps to convert a data.table object to Vowpal Wabbit format. In the process i'm getting the error in printf mentioned in the subject. The original function is here: https://github.com/JohnLangford/vowpal_wabbit/blob/master/R/dt2vw.R
Below there is a small example that reproduces the error. The function works great with smaller (less than 100 columns), as shown. Any suggestions of alternative methods to acomplish the same would be great, but I'm basically asking, is there a reason for the 100 arguments limitation? # Source this function# https://github.com/JohnLangford/vowpal_wabbit/blob/master/R/dt2vw.R # Here is a gist source('https://gist.githubusercontent.com/martinbel/a013c2bd2333b85eeb76/raw/7b68ede0385f3d8684a07854e8d6ca527b9cd441/dt2vw.R') library(data.table) X = cbind(matrix(rnorm(1:1010), nrow=10, ncol=101), sample(c(1, -1), 10, T)) X = as.data.table(X) X[, weight:=ifelse(V102 == 1, 3, 1)] # check out function arguments head(dt2vw, 2)# function (data, fileName, namespaces = NULL, target, weight = NULL, # tag = NULL, hard_parse = F) namespaces = list(a = list(varName = sprintf('V%s',1:50), keepSpace=F), b = list(varName = sprintf('V%s',51:101), keepSpace=F)) dt2vw(data=X, fileName='../out.vw', namespaces = NULL, target='V102', weight = 'weight', tag = NULL, hard_parse = F) ### error # [1] "sprintf('%f %f |A V1:%f V2:%f V3:%f V4:%f V5:%f V6:%f V7:%f V8:%f V9:%f V10:%f V11:%f V12:%f V13:%f V14:%f V15:%f V16:%f V17:%f V18:%f V19:%f V20:%f V21:%f V22:%f V23:%f V24:%f V25:%f V26:%f V27:%f V28:%f V29:%f V30:%f V31:%f V32:%f V33:%f V34:%f V35:%f V36:%f V37:%f V38:%f V39:%f V40:%f V41:%f V42:%f V43:%f V44:%f V45:%f V46:%f V47:%f V48:%f V49:%f V50:%f V51:%f V52:%f V53:%f V54:%f V55:%f V56:%f V57:%f V58:%f V59:%f V60:%f V61:%f V62:%f V63:%f V64:%f V65:%f V66:%f V67:%f V68:%f V69:%f V70:%f V71:%f V72:%f V73:%f V74:%f V75:%f V76:%f V77:%f V78:%f V79:%f V80:%f V81:%f V82:%f V83:%f V84:%f V85:%f V86:%f V87:%f V88:%f V89:%f V90:%f V91:%f V92:%f V93:%f V94:%f V95:%f V96:%f V97:%f V98:%f V99:%f V100:%f V101:%f ',V102, weight, V1, V2, V3, V4, V5, V6, V7, V8, V9, V10, V11, V12, V13, V14, V15, V16, V17, V18, V19, V20, V21, V22, V23, V24, V25, V26, V27, V28, V29, V30, V31, V32, V33, V34, V35, V36, V37, V38, V39, V40, V41, V42, V43, V44, V45, V46, V47, V48, V49, V50, V51, V52, V53, V54, V55, V56, V57, V58, V59, V60, V61, V62, V63, V64, V65, V66, V67, V68, V69, V70, V71, V72, V73, V74, V75, V76, V77, V78, V79, V80, V81, V82, V83, V84, V85, V86, V87, V88, V89, V90, V91, V92, V93, V94, V95, V96, V97, V98, V99, V100, V101)" # Error in sprintf("%f %f |A V1:%f V2:%f V3:%f V4:%f V5:%f V6:%f V7:%f V8:%f V9:%f V10:%f V11:%f V12:%f V13:%f V14:%f V15:%f V16:%f V17:%f V18:%f V19:%f V20:%f V21:%f V22:%f V23:%f V24:%f V25:%f V26:%f V27:%f V28:%f V29:%f V30:%f V31:%f V32:%f V33:%f V34:%f V35:%f V36:%f V37:%f V38:%f V39:%f V40:%f V41:%f V42:%f V43:%f V44:%f V45:%f V46:%f V47:%f V48:%f V49:%f V50:%f V51:%f V52:%f V53:%f V54:%f V55:%f V56:%f V57:%f V58:%f V59:%f V60:%f V61:%f V62:%f V63:%f V64:%f V65:%f V66:%f V67:%f V68:%f V69:%f V70:%f V71:%f V72:%f V73:%f V74:%f V75:%f V76:%f V77:%f V78:%f V79:%f V80:%f V81:%f V82:%f V83:%f V84:%f V85:%f V86:%f V87:%f V88:%f V89:%f V90:%f V91:%f V92:%f V93:%f V94:%f V95:%f V96:%f V97:%f V98:%f V99:%f V100:%f V101:%f ", : # only 100 arguments are allowed # works dt2vw(data=X[, 50:dim(X)[2], with=FALSE], fileName='../out.vw', namespaces = NULL, target='V102', weight = 'weight', tag = NULL, hard_parse = F) system('head -3 ../out.vw') [[alternative HTML version deleted]] ______________________________________________ R-devel@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-devel
