D3.js - maximum and minimum value from json data that has an array of values

Question

How to find max and min values ​​from JSON data. I want the maximum number of checks and control data data1, data2 ... data (n). My code is:

 var max = d3.max(data, function(d) { return d.Checkintimes;} );
 var min = d3.min(data, function(d) { return d.Checkintimes;} );

I tried this option too

d3.json("Values.json", function(data) {



var maxmbt = d3.max(d3.values(data) );
var maxcheckins = d3.max(d3.values(data));

console.log(maxmbt);
console.log(maxcheckins);

xScale.domain([0,maxcheckins]);
xScale.domain([0,maxmbt]);

});

I have json in this format:

[
{
   "name":"data1",
    "checkins":[[1,0],[2,0],[3,0],[4,3],[5,0],[6,0],[7,0],[8,3],[9,0],[10,0],[11,0],[12,0]],
    "teamsize":[[1,0],[2,0],[3,0],[4,3],[5,0],[6,0],[7,0],[8,1],[9,0],[10,0],[11,0],[12,0]],
    "Checkintimes":[[1,0],[2,0],[3,0],[4,184],[5,0],[6,0],[7,0],[8,0],[9,0],[10,0],[11,0],[12,0]]
},


{"name":"data2",


    "checkins":[[1,0],[2,0],[3,0],[4,0],[5,0],[6,0],[7,0],[8,0],[9,0],[10,0],[11,27],[12,12]],
    "teamsize":[[1,0],[2,0],[3,0],[4,0],[5,0],[6,0],[7,0],[8,0],[9,0],[10,0],[11,11],[12,11]],
    "Checkintimes":[[1,0],[2,0],[3,0],[4,0],[5,0],[6,0],[7,0],[8,0],[9,0],[10,0],[11,10],[12,12]]
}
]

Currently, when I use the return value, it is an array. not unitary value. For example, for example, the maximum value of checkins is 27 and Checkintimes is 184 in the above example.

Answer 1

The function d3.maxmust have an accessor that receives individual values. You will need nested calls since you have nested data:

var max = d3.max(data, function(d) {
  return d3.max(d.Checkintimes, function(e) { return d3.max(e); });
});

Answer 2

Try this code:

Fiddle

Js

dataset.forEach(function(d, i) { 
  max= d3.max(d.checkins);
  min=d3.min(d.checkins);
  });