derivative from Data-Stream / sequence floats

Hello all!

This seems to be a very simple question but I just can’t get my head around it:

How can I set up nodes so that it subtracts the current number of a data stream from the previous one.

so float2 - float1, next step float3 - float 2 and so and.

Don’t want to make a C++ function for something that simple.

Any help appreciated :slight_smile:

best regards