Y axis value 0

[chris74]

Hi there,

as said in the title I encountered a problem when the value of the Y axis is 0, my graph “bursts through the ceiling”

on January 1st
[url=https://zupimages.net/viewer.php?id=21/01/nw4h.png][img]https://zupimages.net/up/21/01/nw4h.png[/img][/url]

if I put in column format I have the same problem
I also tried adding includeZero : true,

the code :

var chart7days = {
animationEnabled: true,
zoomEnabled: true,
theme: “dark2”,
title:{
text: “traitement des tickets sur 1 semaine”
},
axisX:{
//title: “Dates”,
labelFormatter: function (e) {
return CanvasJS.formatDate( e.value, “DD MMM”);
},
labelAngle: -20
},
axisY:{
logarithmic: true,
title: “Nombre de tickets”,
maximum : 200,
titleFontColor: “#6D78AD”,
lineColor: “#6D78AD”,
gridThickness: 0,
lineThickness: 1,
},
axisY2:{
titleFontColor: “#51CDA0”,
logarithmic: false,
lineColor: “#51CDA0”,
gridThickness: 0,
lineThickness: 1,
},
axisY3:{
titleFontColor: “#DC143C”,
logarithmic: false,
lineColor: “#DC143C”,
gridThickness: 0,
lineThickness: 1,
},
axisY4:{
titleFontColor: “#FFF168”,
logarithmic: false,
lineColor: “#FFF168”,
gridThickness: 0,
lineThickness: 1,
},
legend:{
verticalAlign: “top”,
fontSize: 16,
dockInsidePlotArea: true
},
data: [{
showInLegend: true,
name: “Backlog”,
type: “spline”,
dataPoints: dataPoints7backlog
},
{
showInLegend: true,
name: “Nouveaux tickets”,
type: “spline”,
dataPoints: dataPoints7new
},
{
showInLegend: true,
name: “Tickets traités”,
type: “spline”,
dataPoints: dataPoints7processed
},
{
showInLegend: true,
name: “ESDI”,
type: “spline”,
dataPoints: dataPoints7esdi
}]
};

if anyone has an idea that interests me
thx
Chris

• This topic was modified 3 years, 3 months ago by chris74.

[chris74]

[url=https://zupimages.net/viewer.php?id=21/01/nw4h.png][img]https://zupimages.net/up/21/01/nw4h.png[/img][/url]

[Shashi Ranjan]

@chris74,

A logarithmic axis can only plot positive values. There simply is no way to put negative values or zero on a logarithmic axis.

Fundamental: If 10L = Z, then L is the logarithm (base 10) of Z. If L is a negative value, then Z is a positive fraction of less than 1.0. If L is zero, then Z equals 1.0. If L is greater than 0, then Z is greater than 1.0. Note that there no value of L will result in a value of Z that is zero or negative. Logarithms are simply not defined for zero or negative numbers.

—
Shashi Ranjan
Team CanvasJS

[chris74]

hi Shashi,

Thanks for your feedback

[chris74]

indeed, if I set the logarithmic to false it works fine
thank you