How can I extract the x and y values from a coordinate pair?

Question

I think the question says it all. I have a coordinate pair, {x,y} and I want to extract x and y for use in further calculations. Can't find anything in the docs about this but it seems like it should be a pretty simple operation.

score 6 · Answer 1 · edited Mar 24 '16 at 20:21

6

{x,y}[[1]]
{x,y}[[2]]

Watch the docs for Part

edited Mar 24 '16 at 20:21

garej

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answered Mar 24 '16 at 20:11

Kay

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score 6 · Answer 2 · edited Apr 13 '17 at 12:55

6

In addition to answer provided by @Kay:

One of the alternative ways to extract data would be using First and Last functions:

Example:

(*Arbitrary data*)
coord = {76, 2};

(*Process*)
First @ coord
Last @ coord

You could also extract the entire set of x and y values.

Example :

(*Arbitrary data*)
data = RandomInteger[{1, 100}, {10, 2}]

(*All 'x' values*)
data[[All, 1]]

(*All 'y' values*)
data[[All, 2]]

Reference:

@ # % etc.
Part
First
Last

Tutorial:

Getting Pieces of Lists

edited Apr 13 '17 at 12:55

Community

1

answered Mar 24 '16 at 20:28

e.doroskevic

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You should perhaps add {x,y}[[-2]] and {x,y}[[-1]]... – garej Mar 24 '16 at 20:38
Yes, this another way to do it – e.doroskevic Mar 24 '16 at 20:41

score 3 · Answer 3 · answered Mar 25 '16 at 04:41

there is another way as well:

#1 & @@ {1, 2} (* gives 1 *)
#2 & @@ {1, 2} (* gives 2 *)

for multiple coordinates in a list:

data = RandomInteger[{1, 100}, {10, 2}]

#1 & @@@ data (* gives all x coordinates *)
#2 & @@@ data (* gives all y coordinates *)

How can I extract the x and y values from a coordinate pair?

3 Answers3