I would like to manually create a line graph and then sample the created line to generate a data series from it.
Basically I have an idea, what a plotted values should look approximately and would like to be able to fine tune the chart, export the data and test on a 3rd party software if the drawn line fits the expected result.
I imagine there should be an option in excel/calc/some other software, which provide an "in-chart" editing and then replicating the changes on the original data set, but so far I wasn't able to find anything like this.
Do you know some why I can easily modify a line chart and get the samples data from it? It can be either in Microsoft excel, LibreOffice Calc, or some other software.