Finding an array of numbers in an array

2018 9 30
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更新时间：2018 9 30
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Hi
I have the attached coords_17 array, which is 2092 x 3 dimensional. Within this array, I want to find say the row which contains the coordinates [44, -30, 54]. However, the following commands fails somehow:
find(coords_17 == [44, -30, 54])
How can I find the relevant coordinates correctly? Many thanks

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Star Strider
Star Strider 2018-9-30

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I would use the ismember (link) function.

Try this:

target = [44, -30, 54];
Lidx = ismember(coords_17, target, 'rows');
row_number = find(Lidx)

row_number =
     2

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MiauMiau
MiauMiau 2018-9-30
Thanks! What is the reason it does not work with a simple "find"?
Star Strider
Star Strider 2018-9-30
Correct.
Using ismember (or ismembertol if you are matching non-integers) first, and then using find is much more efficient.
It might be possible with find, however that would likely require matching each column and then searching for matching row indices.
Star Strider
Star Strider 2018-9-30
As always, my pleasure!

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