# ShortCut[R]: locator

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Welcome to my new category: **ShortCut**! Here I’ll shortly explain some smart features, unknown extensions or uncommon pathways of going for gold.

Today it’s about the Gnu R tool *locator*.

With *locator* you are able to detect the mouse position inside you plot. Just run `locator()`

and click some points, when you’re finished click the right button and *locator* will print the `x`

– and `y`

-values of the clicked positions.

With this tool it’s possible to visually validate some numerical calculation.

With a little bit more code, you can output the coordinates right into you plot:

1 2 3 | > x<-seq (0, 10, .01) > plot (x, dgamma (x, rnorm (1, 2, 0.5), rnorm (1, 1, 0.5)), t=‘l’, main=‘any curve’, ylab=‘y’) > text (p<-locator (1), paste (p, collapse=“\n“), adj=0) |

With a click into the plot you’ll be able to create a result like figure 1.

To

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