From plummer@iarc.fr  Fri Nov 28 11:05:22 1997
From: plummer@iarc.fr (Martyn Plummer)
Date: Fri, 28 Nov 1997 12:05:22 +0100 (MET)
Subject: R-alpha: Problems with dimnames and names
Message-ID: <XFMail.971128122615.plummer@iarc.fr>

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I have rounded up three buglets in R-0.50-a4. Two of them I can
fix and a patch is supplied below. I hope this is useful for the
current source (if these haven't been fixed already :)

1) cov
cov() fails when it's argument is a matrix with one column and with
column names defined. It tries to apply dimnames to the output but
the output is a vector of length 1.

> x <- matrix(rnorm(100),ncol=1,dimnames=list(NULL,"foo"))
> var(x)
Error: dimnames applied to non-array

2) Subscripting one-dimensional arrays.
These are treated as vectors when subscripting
so subscripting by dimnames fails.

> x <- c(0,0,0,1,1,1,1,3)
> table(x)
0 1 3
3 4 1
> table(x)["3"]
Error: subscript out of bounds

3) I have no idea what's going on here.

> c(r=1,s=2)
s
2
> c(u=100,b=4)
b
4

This seems to happen only for "r" and "u". Other single-letter
names are OK. This doesn't happen on my home PC which is still
running R-0.50-a1.

Martyn

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diff -ur R-0.50-a4/src/main/cov.c R-0.50-a4.patched/src/main/cov.c
--- R-0.50-a4/src/main/cov.c	Sun Nov 24 23:43:05 1996
+++ R-0.50-a4.patched/src/main/cov.c	Fri Nov 28 11:21:23 1997
@@ -390,7 +390,7 @@
 	}
 	if(isNull(y)) {
 		x = getAttrib(x, R_DimNamesSymbol);
-		if(!isNull(x) && !isNull(CADR(x))) {
+		if(ncx > 1 && !isNull(x) && !isNull(CADR(x))) {
 			PROTECT(ind = allocList(2));
 			CAR(ind) = CADR(x);
 			CADR(ind) = CADR(x);
@@ -401,7 +401,7 @@
 	else {
 		x = getAttrib(x, R_DimNamesSymbol);
 		y = getAttrib(y, R_DimNamesSymbol);
-		if((!isNull(x) && !isNull(CADR(x))) || (!isNull(y) && !isNull(CADR(y)))) {
+		if((ncx > 1 && !isNull(x) && !isNull(CADR(x))) || ( ncy > 1 && !isNull(y) && 
!isNull(CADR(y)))) {
 			PROTECT(ind = allocList(2));
 			CAR(ind) = CADR(x);
 			CADR(ind) = CADR(y);
diff -ur R-0.50-a4/src/main/subset.c R-0.50-a4.patched/src/main/subset.c
--- R-0.50-a4/src/main/subset.c	Mon Aug 11 04:59:12 1997
+++ R-0.50-a4.patched/src/main/subset.c	Fri Nov 28 11:16:55 1997
@@ -608,7 +608,7 @@
 		PROTECT(dim = getAttrib(x, R_DimSymbol));
 		nsubs = length(subs);
 
-		if(nsubs == 1) {
+		if(nsubs == 1 && isNull(dim)) {
 			ans = vectorSubset(x, CAR(subs), call);
 		}
 		else {

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R-alpha: Problems with dimnames and names
Martyn Plummer