So I have a site where I am doing some data modeling using plotly.js. I am plotting a large number of points (in the thousands). on my backend, I calculate regression equations for the points, and generate coordinates for each x value on the graph. When I plot the equation points in a plotly.js trace, I sometimes get extremely weird results such as
Which is supposed to be a polynomial curve where I get the points using the equation
yPoints.push((quad[0] * (m*m)) + (quad[1] * m) + quad[2])
Where quad[0] quad[1] and quad[2] are the coeffecients that I got from determining the regression analysis.
I am not sure why I am getting such weird graph results for certain sets of coordinates. Does anybody have any idea why?
Alternatively does anybody know of any way to plot a function in a plotly.js graph using either plotly or a third party?
let me know if you need any more info.
Thanks for the help!
Thanks for all of the comments NVRM. As it turns out it wasn't an SVG issue. It wasn't even a plotly issue. The issue was with my data. I have a database which I query for the data that I used to generate the trendline (the points on the graph). For some reason occasionally the y value of the points that I am generating was NULL. This was causing some oddities with the regression calculations, and there were some outliers generated when the value was NULL.
There is still a few oddities with the graph, but the main one is resolved by removing the values with NULL from the trendline consideration.
The moral of the story is always check your data kids.
Related
I'm trying to draw a simple multi line chart from nested data. I'm facing no javascript errors but there is no chart drawn. Even the x-Axis is missing but I cannot find the reason why.
I have made an example here with only one user, the goal would be to have a multitude of users.
http://blockbuilder.org/con-ssc/56b1f647f43b03e8ad5fc923a551b0ed
A few things:
I can't make any sense out of your parseTime function. You parse it, then format it to a string, then parse it again, why?
Your x-axis doesn't show because your SVG needs to be sized to the full width/height, not width/height minus margins.
Your data is not-sorted by the x-axis variable.
Your y scale domain is not being properly set.
Fixing all these problems results in this here.
I'm working on a project where we have some Highcharts graphs populated from database; one of them is an scatter graph and we need to surround the points placed on the outside area of the graph.
We need a graph like this but we need the area surrounding the outside points of the scatter; is there a easy way to do this with Highcharts?
We need it to work on IE11 (client's specs).
We can do it with a new polygon serie to make by getting it from codebehind or from database, but that may take too much development time and will slow down the queries. So we need to know if there is an easier way to do it via Highcharts or Javascript
Thanks in advance.
I am not very familiar with Highcharts, but i could not find such functionality in their API. However there is an easy algorithm to solve your problem.
All you need is to have an array containing the border elements and connect the points from this list like here.
Finding those points is not too hard. Compute the linear equation between two extreme points (like the one on the very top and very right). The resulting formula looks like f(x) = m*x + b
Now you check for all points within that x-range if their y-coordinate is higher than this line (or lower when doing it with the point on the very bottom). If so just add them to your border array and continue with the other extreme points.
I am looking to create a line chart which will plot an array of data which has a corresponding x value (date/time) and y value associated with it. The chart can have any number of series (different lines on the same graph). You can think of this as like how yahoo/google graph a particular stock and if you want to compare different companies stock prices on the same chart.
The problem I am facing is that the data I am given might not be given in regular intervals (e.g. series 1 might give an array of plots that occur every 15 mins, series2 might be 10 mins, etc). Also the data might not have the same start / end time (e.g. series 1 starts at 8:40 am, series 2 starts at 8:42 am). There can also be holes in the data where no data was gathered (want to display this as nothing in the chart)
I have thought about some potential ways to solve this problem
Put everything on a 1 minute interval (the smallest possible interval) and place null values for everything we do not have data for. I need to have null values because there are datatips on the graph when you hover over a point to tell you what the value is at that point. The problem with this is that this will cause the graph to become a point graph rather than a line graph and will look ugly. I can tell dojo to interpret the data between null values but I also want to have explicit null values (e.g. when the market is not open leave the space as nothing rather than connecting the lines)
Round the data to the closest interval. The problem with this is the data is no longer accurate for that particular moment which is a problem.
Don't allow them to be plotted together (not an option).
Use a different charting library (last resort)
I am using the dojox charting library and I cannot change the back end code that gives me the data.
What are my options?
I am looking for a charting library that supports creating graphs with missing data.
A bit of an odd request, but required for my application as my DB doesn't always have a complete data set.
I'm currently using ChartJS to create a line graph, however because there are holes in my data, it is causing my graph to look quite messy.
The graph contains months on the x axis, and a users score on the y axis. There is one year of data, broken in months... and then the user score ranges from 0 - 10
However, sometimes I end up with months with no data, and it is causing NaN for that month. Does anyone know of a graph library that supports missing data, or a work around solution for such an issue?
You actually refer to chart.js
ChartJS supports missing data
I'm trying to plot oscilloscope time traces using highcharts/highstock. The problem is highstock only takes the xAxis as date values. I can't figure out how to force it to only use seconds (because then I could just change the label to nanoseconds).
Highcharts on the other hand can plot anything really but doesnt have the advanced data grouping features that I need to plot these long (and sometimes concatenated - i.e. SUPER long) time traces.
I could go server side with it but I don't think anything beats highcharts in terms of usability and flexibility.
Anyone have any advice?
Have you consider to modify labels, by formatter ?
http://api.highcharts.com/highstock#xAxis.labels.formatter
http://api.highcharts.com/highstock#highcharts.dateFormat()