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Taking Derivative and Graphing

First question is about derivative,
Inside the rpm_2_torquesetpoints.vi there is a derivative term which is not working correctly. It has only positive output for some reason which I couldn't figure out how to fix it.

 

Second question is about graphing, I want to have time on x axis and y axis to have the generated torque setpoints which I also couldn't figure out how where I tried different types of vi's and couldn't make them work. Quite frustrated at labview/myself missing the ease of troubleshooting scriptive languages.


By the way, I am reading help files of various vi's and also reading other people's posts on NI forum. 

 

Thanks in advance!

Arda

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