`violin` trace: why an area is calculated if all values are 0?

Please see my question in stackoverflow

I have an array of values from 0-10 with and 20 groups in each. For some groups or categories all values are 0. When I use violin plot, there is an area calculated which is below 0, but I want to get thedifferent that I got from Seurat package VlnPlot. Is there a way to overcome that problem? Here is a part of java script code:

var my_violin = [];
var vln_layout = {};
var my_violin =[
{
    type:"violin",
    x:xvalues,
    y:my_categories,
    points:"all",
    pointpos:0,
    color:"black",
    width:0.75,
    marker:{color:"black",size:4},
    jitter:1,
    span:0,
    transforms:[
    {
        type:"groupby",
        groups:my_categories,
        styles:my_styles
    }
    ]
}
]

var vln_layout = {title: "my title",    xaxis:{showline: false,showgrid: false,zeroline: false,
    categoryorder: 'category ascending'}, yaxis: {showline: false,showgrid: false,zeroline:false},
    showlegend:true,legend:{traceorder:'normal',categoryorder:"ascending"}};

Plotly.newPlot('myDiv2', my_violin, vln_layout, {showSendToCloud: false});

[alexcjohnson]

I don’t think we can do that, whatever size we choose someone will come up with a data set that has a natural size smaller than that. It has to actually have zero size, even if that means a special case with its own drawing code.

[antoinerg]

Trying to plot datasets [0,0,0,0] (left) and [0,0,0,1] (right) with violins:

• using seaborn:

• using plotly.js: https://codepen.io/antoinerg/pen/oVGxvN

Thanks @micosacak for reporting this issue!