I have a list with dimensions {1000, 1000, 1} and I would like it to have dimensions {1000, 1000}. But Flatten[list,1] makes it {1000000, 1} and I've also tried Flatten[list,-1] with no success. Can I use flatten to do this or will I need a different command?
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1 Answer
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Given a list of similar shape to the one in the question:
$a = Array[a[##] &, {3, 3, 1}];
$a // MatrixForm
... we can tell Flatten to leave level one untouched but flatten levels two and three together:
Flatten[$a, {{1}, {2, 3}}] // MatrixForm
This syntax is the subject of the question Flatten command: matrix as second argument.
Flatten /@ list? $\endgroup$list[[All, All, 1]]will work. $\endgroup$Flatten[list, {1, 3}]also works, butArrayReshape[list, Most@Dimensions@list]might be fastest. $\endgroup$