Splom in JavaScript

How to make D3.js-based splom in Plotly.js.

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Splom of Iris Dataset

The Iris dataset contains four data variables, sepal length, sepal width, petal length petal width, for 150 iris flowers. The flowers are labeled as Iris-setosa, Iris-versicolor, Iris-virginica.

d3.csv('https://raw.githubusercontent.com/plotly/datasets/master/iris-data.csv', function(err, rows){

    function unpack(rows, key) {
        return rows.map(function(row) { return row[key.replace('.',' ')]; });
    }

    colors = []
    for (i=0; i < unpack(rows, 'class').length; i++) {
      if (unpack(rows, 'class')[i] == "Iris-setosa") {
        colors.push(0)
      } else if (unpack(rows, 'class')[i] == "Iris-versicolor") {
        colors.push(0.5)
      } else if (unpack(rows, 'class')[i] == "Iris-virginica") {
        colors.push(1)
      }
    }

    var pl_colorscale=[
               [0.0, '#19d3f3'],
               [0.333, '#19d3f3'],
               [0.333, '#e763fa'],
               [0.666, '#e763fa'],
               [0.666, '#636efa'],
               [1, '#636efa']
    ]

    var axis = () => ({
      showline:false,
      zeroline:false,
      gridcolor:'#ffff',
      ticklen:4
    })

    var data = [{
      type: 'splom',
      dimensions: [
        {label:'sepal length', values:unpack(rows,'sepal length')},
        {label:'sepal width', values:unpack(rows,'sepal width')},
        {label:'petal length', values:unpack(rows,'petal length')},
        {label:'petal width', values:unpack(rows,'petal width')}
      ],
      text: unpack(rows, 'class'),
      marker: {
        color: colors,
        colorscale:pl_colorscale,
        size: 7,
        line: {
          color: 'white',
          width: 0.5
        }
      }
    }]

    var layout = {
      title: {
        text: 'Iris Data set'
      },
      height: 800,
      width: 800,
      autosize: false,
      hovermode:'closest',
      dragmode:'select',
      plot_bgcolor:'rgba(240,240,240, 0.95)',
      xaxis:axis(),
      yaxis:axis(),
      xaxis2:axis(),
      xaxis3:axis(),
      xaxis4:axis(),
      yaxis2:axis(),
      yaxis3:axis(),
      yaxis4:axis()
    }

    Plotly.react('myDiv', data, layout)

});

Splom of Diabetes Dataset

Diabetes dataset is downloaded from kaggle. It is used to predict the onset of diabetes based on 8 diagnostic measures. The diabetes file contains the diagnostic measures for 768 patients, that are labeled as non-diabetic (Outcome=0), respectively diabetic (Outcome=1). The splom associated to the 8 variables can illustrate the strength of the relationship between pairs of measures for diabetic/nondiabetic patients.

d3.csv('https://raw.githubusercontent.com/plotly/datasets/master/diabetes.csv', function(err, rows){

    function unpack(rows, key) {
        return rows.map(function(row) { return row[key]; });
    }

    text = []
    for (i=0; i < unpack(rows, 'Outcome').length; i++) {
      if (unpack(rows, 'Outcome')[i] == "0") {
        text.push("Diabetic")
      } else {
        text.push("Non-Diabetic")
      }
    }

    var pl_colorscale=[
      [0.0, '#119dff'],
      [0.5, '#119dff'],
      [0.5, '#ef553b'],
      [1, '#ef553b']
    ]

    var axis = () => ({
      showline:false,
      zeroline:false,
      gridcolor:'#ffff',
      ticklen:2,
      tickfont:{size:10},
      title:{font:{size:12}}
    })

    var data = [{
      type: 'splom',
      dimensions: [
        {label:'Pregnancies', values:unpack(rows, 'Pregnancies')},
        {label:'Glucose', values:unpack(rows, 'Glucose')},
        {label:'BloodPressure', values:unpack(rows, 'BloodPressure')},
        {label:'SkinThickness', values:unpack(rows, 'SkinThickness')},
        {label:'Insulin', values:unpack(rows, 'Insulin')},
        {label:'BMI', values:unpack(rows, 'BMI')},
        {label:'DiabPedigreeFun', values:unpack(rows, 'DiabetesPedigreeFunction')},
        {label:'Age', values:unpack(rows, 'Age')}
      ],
      text:text,
      marker: {
        color: unpack(rows, 'Outcome'),
        colorscale:pl_colorscale,
        size: 5,
        line: {
          color: 'white',
          width: 0.5
        }
      }
    }]

    var layout = {
      title: {
        text: "Scatterplot Matrix (SPLOM) for Diabetes Dataset<br>Data source: <a href='https://www.kaggle.com/uciml/pima-indians-diabetes-database/data'>[1]</a>"
      },
      height: 1000,
      width: 1000,
      autosize: false,
      hovermode:'closest',
      dragmode:'select',
      plot_bgcolor:'rgba(240,240,240, 0.95)',
      xaxis:axis(),
      yaxis:axis(),
      xaxis2:axis(),
      xaxis3:axis(),
      xaxis4:axis(),
      xaxis5:axis(),
      xaxis6:axis(),
      xaxis7:axis(),
      xaxis8:axis(),
      yaxis2:axis(),
      yaxis3:axis(),
      yaxis4:axis(),
      yaxis5:axis(),
      yaxis6:axis(),
      yaxis7:axis(),
      yaxis8:axis()
    }

    Plotly.react('myDiv', data, layout);

});