How to extract data from a rose chart (image)? - charts

I want to extract the data from this chart which is a rose chart
I want to figure out the percentage of each leaflet
I was looking for a tool to convert the image into data, or an algorithm to do that

Related

Grafana - calculate data before chart plot (JSON data source)

I draw plot based on JSON data source:
But before data presentation, I need to divide every values by 500, so I need see on chart for example value "7 260.236", not "3 630 118"
How to calc it on the fly before chart presentation?

How can I format point data labels in scatter chart using Google Data Studio?

When I'm using Excel I can insert a label on my scatter chart data points, but Google Data Studio only wants me to change the color of the points, I not found any documentation about how insert labels on the points, anyone has idea?
Its at the top of the Style section

pentaho reporting: postprocessing script for scatter chart to display limit (static value) on axis

I have a requirement to generate Scatterplot chart with limits on x and y axis as in the attached image on Pentaho Report Designer.
As there is no option available under scatter plot to display the limit line, I am trying to implement through Post Processing script in chart. But not able to achieve.
Kindly help to achieve the above requirement in Pentaho Report Designer charts.
Here is how you draw a line. Scripting language used is Groovy.
import org.jfree.chart.plot.ValueMarker;
def marker = new ValueMarker(100);
def plot = chart.getPlot();
plot.addDomainMarker(marker);

Stock Chart and Line char in same plot

I have try to combined stock chart and line graph using excel. But it cannot do. I can draw Stock chart and line graph separately. Is anyone know a way to darw stock chart and line chart in same plot. X axis is same.
If you can do this using Matlab, it also okay.
Yes you can plot in MATLAB.
To have a candlestick plot and a line plot of closing prices in the same chart,
candle(HighPrices, LowPrices, ClosePrices, OpenPrices)
hold on
plot(ClosePrices)
HighPrices, LowPrices, ClosePrices, OpenPrices are all columns. The hold on command is to let you plot multiple graphs in the same figure.
candle is for making stock-charts and plot by default makes line charts.
Refer to the MATLAB documentation on the MathWorks website for more clarity.
Combining a stock chart and line graph using Excel without VBA is not possible:

Highcharts Pie chart - 2d array as series

I am using Highcharts to draw some charts, including a pie one. The data needed to draw it are passed as an array, like this
data: [pieSeries]
The pieSieries array is a 2d array, and when I console.debug it this is the result:
Now the problem is that the data are not for some reason the chart is not drawn, there is just one line as in the following picture:
Any idea of why this is happening?
Thanks!