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Author Topic: Taking Derivative of functions using swept parameters  (Read 143 times)
mosey
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« on: January 26, 2018, 06:13:12 PM »

Hello,

Could someone post some working example of use the derivative, D(x), function from the interpreter/post-processor? I've been using TINA industrial 11.2 and cannot get this function to work. I've tried a number of different setups always get the error "Invalid Function name" and can't figure out from the manual what I am doing wrong. Typical reasons are just to plot small signal device parameters like gm, go, etc... from a device DC sweep. But asking more generally as this is a pretty standard post-processing operation.

Thanks
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etl17
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« Reply #1 on: January 28, 2018, 03:25:19 PM »

Where did you find reference of such derivative function D?
Looking at the list of supported build-in functions I only see the following: +, -, *, /, ^, sin, cos, tan, log10, atan, arc, radtodeg, degtorad, ln, exp, abs.
Maybe if you were to somehow define your own function for it (using the advanced edit capability)? Not sure about the supported syntax there....
In any case, I am also interested in finding a way to Integral and Derivative functions in post-processing....
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horvatht
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« Reply #2 on: January 31, 2018, 09:00:57 AM »

There is a derivative (D) function in Tina, but at the moment it is only available in the Interpreter window. Another limitation of the D function that even in the Interpreter window it can be used for the built-in functions only. We may add the D function to the Postprocessor as well in the upcoming releases of Tina
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mosey
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« Reply #3 on: February 01, 2018, 11:32:38 AM »

Hi

Thanks for the response.

etl17 - the reference to the function was in the interpreter manual. It is under the TINA website --> Documentation --> Interpreter  and it is on pg 36. There are some details on how to do integration as well. I've lost the link but there are is a nice example on the TINA-TI forums that show how to use the integral function.

horvatht - thanks for the clarification. It would be a nice addition for general post-processing on waveforms.

Thanks
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etl17
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« Reply #4 on: February 05, 2018, 02:01:44 PM »

Hi mosey,

I see now that your expectation is indeed reasonable based on the published documentation. Sorry for missing your original point.
I agree that adding more functions to the post-processing stage would be beneficial.
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