Wsrtjtyk

I'm trying to show two sets of data on one plot in Chart.js 2.3.0, using an HTML file to trigger js functions to update the global arrays containing the data, then plot it using Chart.js. However, I noticed the plot updates for one data set, but not the other.

The error isn't with generating the data itself, as the successfully plotted data's values rely on the unsuccessfully plotted one. The data seems to be correct (judging by the breakpoints and printing the data in the console throughout), and stored in the right array, just not plotted like its counterpart. The js which generates the unplotted data is

function upDataPol() //Updates the global array "polData" with data generated by genP_z

{

    //The variable "B" used in genP_z is picked randomly from a M-B probability distribution

    var B = randn_MB();

    polData = genP_z(polData, B);

}

while the successful data is made by:

function upDataKT() //Updates the "KTdata" and "KTnorm" arrays' values

{

    //Each member of KTdata is increased by the corresponding value stored in polData

    KTdata = addToData(KTdata, polData);  

    for (i = 0; i < KTdata.length; i++)

    {

        //takes the total KT data and normalises it according to the "noted" number of runs, 

        //then stores it

        KTnorm[i] = KTdata[i]/note; 

    }

}

The Chart.js is:

var ctx = document.getElementById("myChart");

var myChart = new Chart(ctx, 

{

    type: 'line',

    data: 

    {

        labels: time,

        datasets: 

        [

            {   //Data is drawn from the polData array and, below, the KTnorm array

                data: polData, 

                label: "Polarisation",

                borderColor: "#8e5ea2",

                fill: false,

                pointRadius: 1,

                pointHitRadius: 0

            },

            {

                data: KTnorm,

                label: "KT",

                borderColor: "#3e95cd",

                fill: false,

                pointRadius: 1,

                pointHitRadius: 0

            }  

        ]   

    },

    options:

    {

        scales:

        {

            yAxes: 

            [{

                ticks:

                {

                    suggestedMax: 1,

                    suggestedMin: -1/3,

                    stepSize: 1/3

                }

            }]

        }

    }

});

And finally, HTML for the buttons which changes the data and updates the plot:

<a href="#" onclick="upDataPol(); myChart.update();">Click Here to show and add one polarisation function</a><br>

<a href="#" onclick="upDataKT(); myChart.update();">Click Here to update the K-T function</a><br>

I am a newbie to js so any help is appreciated :)