d3 quantile or quartile scale given the quartile values

Question

The current quantile scale takes all the input values as the domain to map the output range. But if the data is extremely large, I want the processing to happen on the server giving me the quartile values.

So I get: var quartiles=[5, 10, 15, 20, 25, 30, 35, 40, 45]; // 9 values with the mean (25) at the middle and standard deviations to each side var valueToMark = 37;

Using d3, how do I correctly create a quantile scale and mark them all on a line given only the quantiles and value to mark?

p.s. my knowledge of quantiles/quartiles is limited, therefore I would be grateful if I'm also corrected on any wrong assumptions I've exhibited here.

Oliver

If you have quartiles, shouldn't you just have values at the 25%, 75% points? You're mapping the standard deviations (and maybe standard score?) with the ranges you provided. – Panther

Because these are quantiles, and assuming there are 8 of them, each section would be 12.5% on the range. But the domain won't be equally split because it is a quantile scale. So if I get a single domain value, how do I know it's position on the output range? – Oliver