Conversion from Mathematica to Matlab

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Sammy Al-Hashmi
Sammy Al-Hashmi 2015-7-17
回答： Walter Roberson 2015-7-17
Hi there. I am trying to convert a piece of code from Mathematica to Matlab. The code is given in the picture. In the mathematica code snippet, there is a section where it defines:
st= FindRoot[V[s] == em, {s,em}][[1,2]]
I am unsure, what is the double sqaure brackets at the end of the expression, [[1,2]]? I have never seen this before nor am I familiar with mathematica. The attached file gives a better idea of what I am asking about. Thanks.

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回答（1 个）

Walter Roberson
Walter Roberson 2015-7-17
In Mathematica, [[1,2]] is indexing at location (1,2); see https://reference.wolfram.com/language/tutorial/ManipulatingListsByTheirIndices.html
In context, they are expecting multiple roots and are extracting the second root.

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