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listlib::insertAt will not work in script

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Ross Hanna
Ross Hanna on 10 Sep 2017
Closed: MATLAB Answer Bot on 20 Aug 2021
Hi there. I am trying to add a zero at the top of my vector so i can minus one vector from the other. Stating the reason may help... I have to work out the displacement of a spring. I am using the equation F=k/x, however, the true equation i need is F=k/(x-y), with y being the displacement of the spring from the original position as it increases the force if it is at a different position. I have looked through lots of the answers on here in regard to adding an element to a vector and subtracting the difference between 2 elements in a vector however diff() was giving the wrong answer and i was also having problems with vector sizes not being equal. The code i have at the moment is attached. This is not a homework problem it is part of my dissertation. Also if anyone can see anything that would slow it down i would be grateful as all of my matlab is self taught. Many Thanks

Answers (1)

Walter Roberson
Walter Roberson on 10 Sep 2017
listlib::insertAt is only for use in MuPAD.
  2 Comments
Ross Hanna
Ross Hanna on 10 Sep 2017
Hi there. I worked out from the documentation that it was only for MuPAD. I guess i should have been clearer with my question. I have now updated it to say that what i would like to know is if there is an equivalent function for use in scripts, another way to code the same thing or if there is something in the maths/physics that i am missing/ made a mistake in. Sorry for the ambiguity.
Walter Roberson
Walter Roberson on 10 Sep 2017
You need to discuss more why you say that "diff was giving the wrong answer".
diff(x) for vector x is the equivalent of x(2:end)-x(1:end-1)
To put a 0 at the beginning of a vector use either
[0, TheVector]
or
[0; TheVector]
depending on whether it is a row or column vector.

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