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Is there a Calculator function like firstVal to get the y-value

Volker T over 1 year ago

Dear all,

Calculator function firstVal() returns the first x-value of a waveform.

I wonder, if there is something like firstVal() to return the first y-value.

Example:

Imagine a DC voltage sweep from 1 V to 2 V and a resulting output waveform VS("/result") with some arbitrary data.

firstVal(VS("/result"))

returns 1.0, as my voltage sweep starts at 1.0 V.

Of course, I could find the corresponding "first" y-value with

value(VS("/result") firstVal(VS("/result")))

The point is though, I need this in a way more complex function, and the formula gets very complex and hard to read if there was no simple and compact way, like a hypthetical "firstY()" function to do the job, like this:

firstY(VS("/result"))

Obviously, ymin or ymax cannot do the job, as the data is arbitrary, i.e. not in ascending or descending order.

Parents

Andrew Beckett over 1 year ago

See this article: How can I get the first or last X or Y value from a waveform?

It doesn't have the functions to register it with the calculator (only the old way of doing it - I'll aim to update the article in the next day or so) - but using the fx button should add the relevant code to the file for you.

Andrew
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Andrew Beckett over 1 year ago in reply to Andrew Beckett

Andrew Beckett said:
It doesn't have the functions to register it with the calculator (only the old way of doing it - I'll aim to update the article in the next day or so)

The article is now updated to have the the builder template stuff included rather than the historical way of registering a calculator function.

Andrew
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Andrew Beckett over 1 year ago in reply to Andrew Beckett

Andrew Beckett said:
It doesn't have the functions to register it with the calculator (only the old way of doing it - I'll aim to update the article in the next day or so)

The article is now updated to have the the builder template stuff included rather than the historical way of registering a calculator function.

Andrew
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Volker T over 1 year ago in reply to Andrew Beckett

Thank you very much.

In the mean time, I had my own Calculator functions "firstY" and "lastY" implemented, working exctly the same way. Still, it is very helpful to see your code.

Edit:

I also added a conditional

        (numberp(signal)
           signal
       )

so that the function can also handle a simple scalar value (you use "wave" as argument name, not "signal" as I do).
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