I'm a professor of mathematics at the University of North Carolina Asheville. I've also done a fair amount of consulting work over the years focusing on scientific and data visualization.
I'm happy to be part of the first Observable Ambassador's cohort.
xAxis = label => g =>
g
.attr('transform', `translate(0,${height - margin.bottom})`)
.call(d3.axisBottom(xScale))
// Add label
.append('text')
.style('text-anchor', 'middle')
.text(label)
.attr('fill', '#000')
.attr('font-size', '16px')
.attr('x', margin.left + (width - margin.left - margin.right) / 2)
.attr('y', 50) // Relative to the x axis.
yAxis = label => g =>
g
.attr('transform', `translate(${margin.left},0)`)
.call(d3.axisLeft(yScale))
// Add label
.append('text')
.style('text-anchor', 'middle')
.text(label)
.attr('fill', '#000')
.attr('font-size', '16px')
.attr('transform', 'rotate(-90)')
.attr('x', -(margin.top + (height - margin.top - margin.bottom) / 2))
.attr('y', -50) // Relative to the y axis.
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