I am trying to draw a linear function(like y=ax+b) by using Chartkick gem and google chart on my rails application.
'a' and 'b' will be given as parameters.
The problem is that I am trying to achieve an infinite line graph using google chart out of slope 'a' and 'b' and I don't know how to achieve this in a proper way.
I came up with the solution of drawing a line chart with two points, (-b/a, 0) and (0, b) and give trendlines option onto it.
<!-- y = 0.55x floatify(2,@datas[4][2]) + 1.47 floatify(2,@datas[3][2]) -->
<%= line_chart [
{name: "targets",
data: [
["#{-(@datas[3][2].to_f/@datas[4][2].to_f).round(2)}",0],
[0,"#{@datas[3][2].to_f}"]
]
},
],
library: {
title: "#{@simplereg.variable_name}",
subtitle: "#{@simplereg.data_name}",
legend: "right",
vAxis: {title: 'average'},
trendlines: {
0: {
type: 'exponential',
visibleInLegend: true
}
}
}
%>
However, rails cannot read a '0' value as an option of trendlines unlike what google chart documentation says. -> https://developers.google.com/chart/interactive/docs/gallery/trendlines I have no clue how to fix this code to work.
Please help me... I don't mind throwing up this code and writing in completely different way.
Thanks ahead.
Use something like below
basically instead of symbo 0: use "0" =>