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Array manipulation in calculator

manudupouy

Hello,

I need to manipulate arrays with expression editor of the calculator. But I did not succeed.

I made a simple simulation of Id=f(Vgs) para um transistor NMOS. I put the result of Id in a variable: Id = i("/V1/PLUS" ?result "dc").

There is 50 points of simulation. How can I keep only the last 30 points for example.

I tried Id_reduc = Id[20:50], but it don't work.

I know it exists clip function, but for me, it would be easier to directly manipulate an array with its reference.

Thanks in advance

Emmanuel

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  • manudupouy

    Hello Andrew,

    I would like to obtain the following curve:  deriv(log (Id)) / deriv(log (Vgs)), the derivate of log(Id) related to log(Vgs). 

    If I use the function deriv, I will obtain deriv(log(Id)) / deriv(Vgs) and not deriv(log(Vgs))

    If I could manipulate vectors of points, for example with a 50 points vector, I could make the following operation: (log(Id[2:50]) - log(Id[1:49])) / (log(Vgs[2:50]) - log(Vgs[1:49]))

    I tried with clip, but it did not work, as the signal is indexed to another variable.

    Do you have a solution please?

    Regards,

    Emmanuel

Reply
  • manudupouy

    Hello Andrew,

    I would like to obtain the following curve:  deriv(log (Id)) / deriv(log (Vgs)), the derivate of log(Id) related to log(Vgs). 

    If I use the function deriv, I will obtain deriv(log(Id)) / deriv(Vgs) and not deriv(log(Vgs))

    If I could manipulate vectors of points, for example with a 50 points vector, I could make the following operation: (log(Id[2:50]) - log(Id[1:49])) / (log(Vgs[2:50]) - log(Vgs[1:49]))

    I tried with clip, but it did not work, as the signal is indexed to another variable.

    Do you have a solution please?

    Regards,

    Emmanuel

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