add_bars {plotfunctions}

Adding bars to an existing plot.

Description

Adding bars to an existing plot.

Usage

add_bars(x, y, y0 = NULL, width = 1, horiz = FALSE, ...)

Arguments

x

Numeric vector with x-positions of bars.

y

Numeric vector with height of the bars.

y0

Optional numeric value or vector with the onset(s) of the bars. When \codey0 is not specified, the lowest value of the y-axis is used.

width

Numeric value, determining the width of the bars in units of the x-axis.

horiz

Logical value: whether or not to plot horizontal bars. Defaults to FALSE.

...

Other arguments for plotting, see \code\link[graphics]par.

Author(s)

Jacolien van Rij

See Also

Other Functions for plotting: addInterval(), add_n_points(), alphaPalette(), alpha(), check_normaldist(), color_contour(), dotplot_error(), drawDevArrows(), emptyPlot(), errorBars(), fill_area(), getCoords(), getFigCoords(), getProps(), gradientLegend(), legend_margin(), marginDensityPlot(), plot_error(), plot_image(), plotsurface(), sortBoxplot()

Examples

# hypothetical experiment:
adults   =  stats::rpois(100, lambda = 5)
children =  stats::rpois(100, lambda = 4)
newd <- data.frame(Adults = table( factor(adults, levels=0:15) ),
    Children = table( factor(children, levels=0:15) ) )
newd <- newd[,c(1,2,4)]
names(newd)[1] <- 'value'

# barplot of Adults:
b <- barplot(newd$Adults.Freq, beside=TRUE, names.arg=newd$value, 
    border=NA, ylim=c(0,30))
# overlay Children measures:
add_bars(b, newd$Children.Freq, col='red', density=25, xpd=TRUE)

# variants:
b <- barplot(newd$Adults.Freq, beside=TRUE, names.arg=newd$value, 
    border=NA, ylim=c(0,30))
add_bars(b+.1, newd$Children.Freq, width=.85, col=alpha('red'), 
    border=NA, xpd=TRUE)

emptyPlot(c(-30,30), c(0,15), v0=0, ylab='Condition')
add_bars(-1*newd$Children.Freq, 0:15, y0=0, col=alpha('blue'), 
    border='blue', horiz=TRUE)
add_bars(newd$Adults.Freq, 0:15, y0=0, col=alpha('red'), 
    border='red', horiz=TRUE)
mtext(c('Children', 'Adults'), side=3, at=c(-15,15), line=1, cex=1.25, 
    font=2)

# adding shadow:
b <- barplot(newd$Adults.Freq, beside=TRUE, names.arg=newd$value, 
    width=.9, 
    col='black', border=NA)
add_bars(b+.2, newd$Adults.Freq+.2, y0=.2, width=.9, 
    col=alpha('black', f=.2), border=NA, xpd=TRUE)