When converting cumulative data to "stepwise" data it would be good to also have the option to retrieve the first difference value assuming that the preceding or "zeroth" value of the cumulative was zero - somewhat similar to what is available in Moving Transform
Actual behavior
The first difference value returns a question mark
Steps to reproduce the behavior
Any action involving Difference, unless Invert has been checked
Timeseries version
0.5.1
Orange version
3.33
Expected behavior
When converting cumulative data to "stepwise" data it would be good to also have the option to retrieve the first difference value assuming that the preceding or "zeroth" value of the cumulative was zero - somewhat similar to what is available in Moving Transform
Actual behavior
The first difference value returns a question mark
Steps to reproduce the behavior
Any action involving Difference, unless Invert has been checked