What does this means?
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i was working on a class assignment and then i found this one operation i found it confussing.
G= [ 1 2 3; 4 5 6; 7 8 9];
H= G([1 3], [1 2]);
what does the function H do to the G matrix?
i tried to change the numbers inside the brackets but it shuffles the elements of the matrix G and i dont understand how it works.
is there any documentation referring to this problem?
1 Commento
Stephen23
il 19 Mar 2023
Modificato: Stephen23
il 19 Mar 2023
"what does the function H do to the G matrix?"
Nothing: there is no function H, and that indexing does not change G at all.
H is simply the name of a variable that the result of some indexing is assigned to, i.e. H is an array.
"is there any documentation referring to this problem?"
Of course, see the end of the section Indexing Matrices with Two Subscripts here:
Indexing is a MATLAB superpower. Basic indexing concepts are introduced here:
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Star Strider
il 19 Mar 2023
It returns the elements in from rows 1 and 3 in columns 1 and 2 —
G= [ 1 2 3; 4 5 6; 7 8 9];
H= G([1 3], [1 2])
.
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