Hi Julien,
>From my point of view this error may be produced by the fact you are working
>with a lot of variables, so the number of characters if you take them into
>account as character is bigger than the system can support.
Have you tried to test an example with 50 variables, for example?.
See you the error message in function code:
> model.matrix.default
function (object, data = environment(object), contrasts.arg = NULL,
xlev = NULL, ...)
{
t <- if (missing(data))
terms(object)
else terms(object, data = data)
if (is.null(attr(data, "terms")))
data <- model.frame(object, data, xlev = xlev)
else {
reorder <- match(sapply(attr(t, "variables"), deparse,
width.cutoff = 500)[-1L], names(data))
if (any(is.na(reorder)))
stop("model frame and formula mismatch in model.matrix()")
if (!identical(reorder, seq_len(ncol(data))))
data <- data[, reorder, drop = FALSE]
}
int <- attr(t, "response")
if (length(data)) {
contr.funs <- as.character(getOption("contrasts"))
namD <- names(data)
for (i in namD) if (is.character(data[[i]])) {
data[[i]] <- factor(data[[i]])
warning(gettextf("variable '%s' converted to a factor",
i), domain = NA)
}
isF <- sapply(data, function(x) is.factor(x) || is.logical(x))
isF[int] <- FALSE
isOF <- sapply(data, is.ordered)
for (nn in namD[isF]) if (is.null(attr(data[[nn]], "contrasts")))
contrasts(data[[nn]]) <- contr.funs[1 + isOF[nn]]
if (!is.null(contrasts.arg) && is.list(contrasts.arg)) {
if (is.null(namC <- names(contrasts.arg)))
stop("invalid 'contrasts.arg' argument")
for (nn in namC) {
if (is.na(ni <- match(nn, namD)))
warning(gettextf("variable '%s' is absent, its contrast will
be ignored",
nn), domain = NA)
else {
ca <- contrasts.arg[[nn]]
if (is.matrix(ca))
contrasts(data[[ni]], ncol(ca)) <- ca
else contrasts(data[[ni]]) <- contrasts.arg[[nn]]
}
}
}
}
else {
isF <- FALSE
data <- data.frame(x = rep(0, nrow(data)))
}
ans <- .Internal(model.matrix(t, data))
cons <- if (any(isF))
lapply(data[isF], function(x) attr(x, "contrasts"))
else NULL
attr(ans, "contrasts") <- cons
ans
}
Regards,
Eva
--- El vie, 12/4/13, jul 2-pom <j.pom...@ibmc-cnrs.unistra.fr> escribió:
De: jul 2-pom <j.pom...@ibmc-cnrs.unistra.fr>
Asunto: [R] model frame and formula mismatch in model.matrix()
Para: r-help@r-project.org
Fecha: viernes, 12 de abril, 2013 21:05
Hello everyone,
I am trying to fit the following model
All X. variables are continuous, while the conditions are categoricals.
model <- lm(X2
+X3+X4+X5+X6+X7+X8+X9+X10+X11+X12+X13+X14+X15+X16+X17+X18+X19+X20+X21+X22+X23+X24+X25+X26+X27+X28+X29+X30+X31+X32+X33+X34+X35+X36+X37+X38+X39+X40+X41+X42+X43+X44+X45+X46+X47+X48+X49+X50+X51+X52+X53+X54+X55+X56+X57+X58+X59+X60+X61+X62+X63+X64+X65+X66+X67+X68+X69+X70+X71+X72+X73+X74+X75+X76+X77+X78+X79+X80+X81+X82+X83+X84+X85+X86+X87+X88+X89+X90+X91+X92+X93+X94+X95+X96+X97+X98+X99+X100+X101+X102+X103+X104+X105+X106+X107+X108+X109+X110+X111+X112+X113+X114+X115+X116+X117+X118+X119+X120+X121+X122+X123+X124+X125+X126+X127+X128+X129+X130+X131+X132+X133+X134+X135+X136+X137+X138+X139+X140+X141+X142+X143+X144+X145+X146+X147+X148+X149+X150+X151+X152
~ conditions, data = proteo)
but I get this error message:
Error in model.matrix.default(mt, mf, contrasts) :
model frame and formula mismatch in model.matrix()
can someone help me please?
Julien.
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