javascript - How to put string label on X axis in d3 -

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i using scatter plot d3 , i'm trying label x axis of plot string can read csv file.

here code current implementation:

var xvalue = function(d) { return d.age;}, // data -> value     xscale = d3.scale.linear().range([0, width]), // value -> display     xmap = function(d) { return xscale(xvalue(d));}, // data -> display     xaxis = d3.svg.axis().scale(xscale).orient("bottom");  var yvalue = function(d) { return d["income"];}, // data -> value     yscale = d3.scale.linear().range([height, 0]), // value -> display     ymap = function(d) { return yscale(yvalue(d));}, // data -> display     yaxis = d3.svg.axis().scale(yscale).orient("left");  d3.csv("predict_plot_h1b.csv", function(error, data) {     // x-axis     // y-axis      // other d3 elements  });

this gives me (only x axis labels important in plot below):

enter image description here

this csv data looks like:

age, income 72, 2 50, 1 55, 3 50, 2 80, 2

so on here want use exact age labels instead of using range 50 80.

how can modify code x axis label appear 50 55 72 80 instead of 50 60 70 80


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