## Untested solution which I believe should work!

letters658 = make.unique(rep(letters, length.out = 658), sep='') #use letters658 instead of LETTERS R constant

The above code makes up for the R constant LETTERS only having 26 levels when R has 657 colours (add 1 since waffle() starts at ‘B’ instead of ‘A’). So having 657 letters will allow all R colours to be plotted safely instead of any colour beyond the first 26 being turned into ‘not a number’ i.e. NA.

## Tested Solution

waffle(), the R function to compute square bar charts, fails when there are more than 25 levels. Herewith my fixed version!

printf <- function(...) {
invisible(print(sprintf(...)))
}
myletters <- function(n)
unlist(Reduce(
paste0,
replicate(n %/% length(letters), letters, simplify = FALSE),
init = letters,
accumulate = TRUE
))[1:n]

letters1000 = myletters(657)

waffle2 <-
function (parts,
rows = 10,
xlab = NULL,
title = NULL,
colors = NA,
size = 2,
flip = FALSE,
reverse = FALSE,
equal = TRUE,
use_glyph = FALSE,
glyph_size = 12,
legend_pos = "right")
{
part_names <- names(parts)
print(part_names)
if (length(part_names) < length(parts)) {
printf("length:parts:%d", length(parts))
printf("length partname:%d", length(part_names))
part_names <- c(part_names, letters1000[1:length(parts) -
length(part_names)])
}
print(part_names)
if (all(is.na(colors))) {
colors <- brewer.pal(length(parts), "Set2")
}
print(parts)
printf("BEFORE unlist() length:parts:%d", length(parts))
parts_vec <- unlist(sapply(1:length(parts), function(i) {
rep(letters1000[i + 1], parts[i])
}))
if (reverse) {
parts_vec <- rev(parts_vec)
}
print("parts_vec:")
print(parts_vec)
dat <-
expand.grid(y = 1:rows, x = seq_len(pad + (ceiling(sum(
parts
) / rows))))
dat\$value <- c(parts_vec, rep(NA, nrow(dat) - length(parts_vec)))
print(dat)
if (!inherits(use_glyph, "logical")) {
fontlab <- rep(fa_unicode[use_glyph], length(unique(parts_vec)))
dat\$fontlab <- c(fontlab[as.numeric(factor(parts_vec))],
rep(NA, nrow(dat) - length(parts_vec)))
}
if (flip) {
gg <- ggplot(dat, aes(x = y, y = x))
}
else {
gg <- ggplot(dat, aes(x = x, y = y))
}
gg <- gg + theme_bw()
if (inherits(use_glyph, "logical")) {
gg <- gg + geom_tile(aes(fill = value), color = "white",
size = size)
gg <- gg + scale_fill_manual(name = "",
values = colors,
labels = part_names)
gg <-
gg + guides(fill = guide_legend(override.aes = list(colour = NULL)))
}
else {
if (choose_font("FontAwesome", quiet = TRUE) == "") {
stop(
call. = FALSE
)
}
suppressWarnings(suppressMessages(font_import(
system.file("fonts",
package = "waffle"),
recursive = FALSE,
prompt = FALSE
)))
if (!(!interactive() || stats::runif(1) > 0.1)) {
message("Font Awesome by Dave Gandy - http://fontawesome.io")
}
gg <- gg + geom_tile(
color = NA,
fill = NA,
size = size,
alpha = 0,
show_guide = FALSE
)
gg <- gg + geom_point(
aes(color = value),
fill = NA,
size = 0,
show_guide = TRUE
)
gg <- gg + geom_text(
aes(color = value, label = fontlab),
family = "FontAwesome",
size = glyph_size,
show_guide = FALSE
)
gg <- gg + scale_color_manual(name = "",
values = colors,
labels = part_names)
gg <-
gg + guides(color = guide_legend(override.aes = list(shape = 15,
size = 7)))
gg <- gg + theme(legend.background = element_rect(fill = NA,
color = NA))
gg <- gg + theme(legend.key = element_rect(color = NA))
}
gg <- gg + labs(x = xlab, y = NULL, title = title)
gg <- gg + scale_x_continuous(expand = c(0, 0))
gg <- gg + scale_y_continuous(expand = c(0, 0))
if (equal) {
gg <- gg + coord_equal()
}
gg <- gg + theme(panel.grid = element_blank())
gg <- gg + theme(panel.border = element_blank())
gg <- gg + theme(panel.background = element_blank())
gg <- gg + theme(panel.margin = unit(0, "null"))
gg <- gg + theme(axis.text = element_blank())
gg <- gg + theme(axis.title.x = element_text(size = 10))
gg <- gg + theme(axis.ticks = element_blank())
gg <- gg + theme(axis.line = element_blank())
gg <- gg + theme(axis.ticks.length = unit(0, "null"))
gg <- gg + theme(plot.title = element_text(size = 18))
gg <- gg + theme(plot.background = element_blank())
gg <- gg + theme(plot.margin = unit(c(0, 0, 0, 0), "null"))
gg <- gg + theme(plot.margin = rep(unit(0, "null"), 4))
gg <- gg + theme(legend.position = legend_pos)
gg
}