-#* Copyright © - 2008-2013 ANR Textométrie - http://textometrie.ens-lyon.fr
-#*
-#* This file is part of the TXM platform.
-#*
-#* The TXM platform is free software: you can redistribute it and/or modif y
-#* it under the terms of the GNU General Public License as published by
-#* the Free Software Foundation, either version 3 of the License, or
-#* (at your option) any later version.
-#*
-#* The TXM platform is distributed in the hope that it will be useful,
-#* but WITHOUT ANY WARRANTY; without even the implied warranty of
-#* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-#* General Public License for more details.
-#*
-#* You should have received a copy of the GNU General Public License
-#* along with the TXM platform. If not, see <http://www.gnu.org/licenses/>.
-
-## Sylvain Loiseau <sloiseau@u-paris10.fr>
-## Lise Vaudor <lise.vaudor@ens-lyon.fr>
-
-phyper_bis=function(v_a,v_b,v_c,v_d){
- v_s2=rep(NA,length(v_a))
- for (j in 1:length(v_a)){
- a=v_a[j]
- b=v_b[j]
- c=v_c[j]
- d=v_d
- a_tmp=a#+1
- s1=dhyper(a_tmp,b,c,d)
- s_tmp=dhyper(a_tmp+1,b,c,d)
- s2=s1+s_tmp
- a_tmp=a_tmp+1
- while(log(s2)!=log(s1)){
- s1=s2
- a_tmp=a_tmp+1
- s_tmp=dhyper(a_tmp,b,c,d)
- s2=s1+s_tmp
- }
- v_s2[j]=s2
- }
- return(v_s2)
-}
-
-`specificites` <-
- function(lexicaltable, types=NULL, parts=NULL) {
- spe <- specificites.probabilities(lexicaltable, types, parts);
- spelog <- matrix(0, nrow=nrow(spe), ncol=ncol(spe));
- spelog[spe < 0] <- log10(-spe[spe < 0]);
- spelog[spe > 0] <- abs(log10(spe[spe >0]));
- spelog[spe == 0] <- 0;
- spelog[is.infinite(spe)] <- 0;
- spelog <- round(spelog, digits=4);
- rownames(spelog) <- rownames(spe);
- colnames(spelog) <- colnames(spe);
- #class(spelog) <- "specificites";
- #attr(spelog, "l.t") <- spe;
- return(spelog);
- }
-
-`specificites.probabilities` <-
- function(lexicaltable, types=NULL, parts=NULL) {
-
- # if (!is.numeric(lexicaltable)) stop("The lexical table must contain numeric values.");
-
- rowMargin <- rowSums(lexicaltable); # or "F" (the total frequency of all the types).
- colMargin <- colSums(lexicaltable); # or "T" (the size of the parts).
- F <- sum(lexicaltable); # The grand total (number of tokens in the corpus).
-
- if (! is.null(types)) { # Filter on tokens to be considered.
- if(is.character(types)) { # convert the name of types given with "types" into row index numbers.
- if (is.null(rownames(lexicaltable))) stop("The lexical table has no row names and the \"types\" argument is a character vector.");
- if (! all(types %in% rownames(lexicaltable))) stop(paste(
- "Some requested types are not known in the lexical table: ",
- paste(types[! (types %in% rownames(lexicaltable))], collapse=" "))
- );
- } else {
- if (any(types < 1)) stop("The row index must be greater than 0.");
- if (max(types) > nrow(lexicaltable)) stop("Row index must be smaller than the number of rows.");
- }
- lexicaltable <- lexicaltable[types,, drop = FALSE];
- rowMargin <- rowMargin[types];
- }
-
- if (! is.null(parts)) { # Filter on parts to be considered.
- if(is.character(parts)) { # convert the name of parts given with "parts" into col index numbers.
- if (is.null(colnames(lexicaltable))) stop("The lexical table has no col names and the \"parts\" argument is a character vector.");
- if (! all(parts %in% colnames(lexicaltable))) stop(paste(
- "Some requested parts are not known in the lexical table: ",
- paste(parts[! (parts %in% colnames(lexicaltable))], collapse=" "))
- );
- } else {
- if (max(parts) > ncol(lexicaltable)) stop("Column index must be smaller than the number of cols.");
- if (any(parts < 1)) stop("The col index must be greater than 0.");
- }
- lexicaltable <- lexicaltable[,parts, drop=FALSE];
- colMargin <- colMargin[parts];
- }
-
- if (nrow(lexicaltable) == 0 | ncol(lexicaltable) == 0) {
- stop("The lexical table must contains at least one row and one column.");
- }
-
- specif <- matrix(0.0, nrow=nrow(lexicaltable), ncol=ncol(lexicaltable));
-
- for(i in 1:ncol(lexicaltable)) { # We proceed the whole lexical table by column (i.e. by part).
-
- whiteDrawn <- lexicaltable[,i]; # The frequencies observed in this part for each type.
- white <- rowMargin; # The total frequencies in the corpus for each type.
- black <- F-white; # The total complement frequency in the corpus for each type.
- drawn <- colMargin[i]; # The number of tokens in the part.
-
-
- independance <- (white * drawn) / F; # The theoretic frequency of each type.
- specif_negative <- whiteDrawn < independance; # index of observed frequencies below the theoretic frequencies.
- specif_positive <- whiteDrawn >= independance; # index of observed frequencies above the theoretic frequencies.
-
- specif[specif_negative,i] <- -phyper (
- whiteDrawn[specif_negative], white[specif_negative], black[specif_negative], drawn
- );
-
- specif[specif_positive,i] <- phyper_bis (
- whiteDrawn[specif_positive], white[specif_positive], black[specif_positive], drawn
- );
- }
-
- colnames(specif) <- colnames(lexicaltable);
- rownames(specif) <- rownames(lexicaltable);
-
- return(specif);
- }
-
-`specificites.lexicon` <-
- function(lexicon, sublexicon) {
- spe <- specificites.lexicon.probabilities(lexicon, sublexicon);
- spelog <- matrix(0, nrow=nrow(spe), ncol=ncol(spe));
- spelog[spe < 0] <- log10(-spe[spe < 0]);
- spelog[spe > 0] <- abs(log10(spe[spe >=0]));
- spelog[spe == 0] <- 0;
- spelog[is.infinite(spe)] <- 0;
- spelog <- round(spelog, digits=4);
- rownames(spelog) <- rownames(spe);
- colnames(spelog) <- colnames(spe);
- #class(spelog) <- "specificites";
- #attr(spelog, "l.t") <- spe;
- return(spelog);
- }
-
-`lexiconsToLexicalTable` <- function(lexicon, sublexicon) {
- if (! all(names(sublexicon) %in% names(lexicon)))
- stop(paste(
- sum(! (names(sublexicon) %in% names(lexicon))),
- "types of the sublexicon not found in the lexicon: ",
- )
- );
-
- sub <- numeric(length(lexicon));
- names(sub) <- names(lexicon);
- sub[names(sublexicon)] <- sublexicon;
-
- complementary.lexicon <- c(lexicon- sub);
- if (any(complementary.lexicon < 0))
- stop("type cannot be more frequent in the sublexicon than in the lexicon");
-
- lexicaltable <- matrix(c(sub, complementary.lexicon), ncol=2);
- rownames(lexicaltable) <- names(lexicon);
- colnames(lexicaltable) <- c("sublexicon", "complementary");
- return(lexicaltable)
-}
-
-`specificites.lexicon.new` <- function(lexicon, sublexicon) {
- lexicaltable <- lexiconsToLexicalTable(lexicon, sublexicon);
- return(specificites(lexicaltable,NULL,NULL));
-}
-
-`specificites.lexicon.probabilities` <-
- function(lexicon, sublexicon) {
-
- if (!is.numeric(lexicon)) stop("The lexicon must contain numeric values.");
- if (!is.numeric(sublexicon)) stop("The sublexicon must contain numeric values.");
- if (is.null(names(lexicon))) stop("The lexicon must contain names.");
- if (is.null(names(sublexicon))) stop("The sub lexicon must contain names.");
-
- if (! all(names(sublexicon) %in% names(lexicon)))
- stop(
- paste(
- "Some requested types of the sublexicon are not known in the lexicon: ",
- paste(names(sublexicon)[! (names(sublexicon) %in% names(lexicon))], collapse=" ")
- )
- );
-
- F <- sum(lexicon);
- f <- sum(sublexicon);
-
- # complementary.lexicon <- c(lexicon[names(sublexicon)] - sublexicon, lexicon[!names(lexicon) %in% names(sublexicon)]);
-
- if (F < f) {
- stop("The lexicon cannot be smaller than the sublexicon");
- }
-
- whiteDrawn <- numeric(length(lexicon)); # The frequencies observed in this part for each type.
- names(whiteDrawn) <- names(lexicon);
- whiteDrawn[names(sublexicon)] <- sublexicon;
- white <- lexicon; # The total frequencies in the corpus for each type.
- black <- F-white; # The total complement frequency in the corpus for each type.
- drawn <- f; # The number of tokens in the part.
-
- # print(whiteDrawn);
- # print(white);
- # print(black);
- # print(drawn);
-
- independance <- (white * drawn) / F; # The theoretic frequency of each type.
-
- specif_negative <- whiteDrawn < independance; # index of observed frequencies below the theoretic frequencies.
- specif_positive <- whiteDrawn >= independance; # index of observed frequencies above the theoretic frequencies.
-
- specif <- double(length(lexicon));
-
- specif[specif_negative] <- phyper (
- whiteDrawn[specif_negative], white[specif_negative], black[specif_negative], drawn
- );
-
- specif[specif_positive] <- phyper_bis (
- whiteDrawn[specif_positive], white[specif_positive], black[specif_positive], drawn
- );
-
- names(specif) <- names(lexicon);
-
- return(specif);
- }
-
-`SpecifTopN` <- function(Specif, N=10, file=NULL) {
- symbol = Specif
- top <- c()
- cols <- colnames(symbol)
-
- for (i in 1:length(cols)) {
- sorted <- sort(symbol[, cols[i]], decreasing=TRUE, index.return= TRUE)$x
- top <- union(top, names(sorted[1:N]))
- top <- union(top, names(sorted[length(sorted) -N: length(sorted)]))
- }
-
- symbol <- symbol[top,]
- if (file != NULL) {
- write.table(symbol, file)
- }
-}
-
-#print.specificites(x, line=20, part=1, form=NULL, ...) {
-# if (all(is.null(line, part))) {
-# stop("either a line or a part must be specified");
-# }
-# if (all(!is.null(line, part))) {
-# stop("only a line or a part must be specified");
-# }
-#}
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