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Formula extensions #537

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723ae19
tinyframe() can now handle formulas without variables (e.g., ~ 1 or ~ 0)
zeileis Dec 15, 2025
e4b53d5
support formulas without x-variable such as ~ 0 or ~ 1 or y ~ 1 etc.
zeileis Dec 15, 2025
636e832
handle names(x) only if non-NULL
zeileis Dec 15, 2025
06775ae
handle defaults for cases where x or y is NULL
zeileis Feb 4, 2026
c8aa24d
set xnam/ynam to NULL if x/y are missing
zeileis Feb 4, 2026
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17 changes: 15 additions & 2 deletions R/sanitize_type.R
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Original file line number Diff line number Diff line change
Expand Up @@ -43,10 +43,23 @@ sanitize_type = function(settings) {
assert_choice(type, known_types, null.ok = TRUE)

if (is.null(type)) {
if (!is.null(x) && (is.factor(x) || is.character(x)) && !(is.factor(y) || is.character(y))) {
if (is.null(x) && !(is.factor(y) || is.character(y))) {
# enforce histogram type for y ~ 1
settings$x = y
settings$y = NULL
type = type_hist
} else if (is.null(x) && (is.factor(y) || is.character(y))) {
# enforce barplot type for factor(y) ~ 1
settings$x = y
settings$y = NULL
type = type_barplot
} else if ((is.factor(x) || is.character(x)) && is.null(y)) {
# enforce barplot type for ~ factor(y)
type = type_barplot
} else if (!is.null(x) && (is.factor(x) || is.character(x)) && !(is.factor(y) || is.character(y))) {
# enforce boxplot type for y ~ factor(x)
type = type_boxplot
} else if (is.factor(y) || is.character(y)) {
} else if (!is.null(x) && (is.factor(y) || is.character(y))) {
# enforce spineplot type for factor(y) ~ x
type = type_spineplot
} else {
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4 changes: 3 additions & 1 deletion R/tinyformula.R
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Expand Up @@ -74,6 +74,8 @@ tinyframe = function(formula, data, drop = FALSE) {
## - formula: (sub-)formula
## - data: model.frame from full formula
if (is.null(formula)) return(NULL)
names = sapply(attr(terms(formula), "variables")[-1L], deparse, width.cutoff = 500L)
vars = attr(terms(formula), "variables")[-1L]
if (is.null(vars)) return(NULL)
names = sapply(vars, deparse, width.cutoff = 500L)
data[, names, drop = drop]
}
15 changes: 10 additions & 5 deletions R/tinyplot.R
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Expand Up @@ -1429,13 +1429,16 @@ tinyplot.formula = function(
m[[1L]] = quote(stats::model.frame)
mf = eval.parent(m)

## extract x
## extract x (if any)
x = tinyframe(tf$x, mf)
xnam = names(x)[[1L]]
if (length(names(x)) != 1L) warning(
paste("formula should specify exactly one x-variable, using:", xnam),
if (!is.null(x)) {
xnam = names(x)[[1L]]
if (length(names(x)) > 1L) warning(paste("formula should specify at most one x-variable, using:", xnam),
"\nif you want to use arithmetic operators, make sure to wrap them inside I()")
x = x[[xnam]]
x = x[[xnam]]
} else {
xnam = NULL
}

## extract y (if any)
y = tinyframe(tf$y, mf)
Expand All @@ -1444,6 +1447,8 @@ tinyplot.formula = function(
if (length(names(y)) > 1L) warning(paste("formula should specify at most one y-variable, using:", ynam),
"\nif you want to use arithmetic operators, make sure to wrap them inside I()")
y = y[[ynam]]
} else {
ynam = NULL
}

## extract by (if any)
Expand Down