Returning result in R

Question

I have a 1 X 1000 vector = x of numbers from 1 to 1000, and a certain function = y into which I plug in these numbers, resulting in a 1 x 1000 vector of results. I would like for R to return the value of y at which the function is greater than a certain number. How can this be done?

IRTFM · Accepted Answer · 2014-01-20 17:15:48Z

2

 res[ which(res > threshold)[1] ] #........

edited Jan 20, 2014 at 17:15

answered Jan 20, 2014 at 6:24

IRTFM

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2 Comments

JeremyS Over a year ago

doesn't this return the value of x at which y is above the threshold? But the question asks for the value of y ... (or does it?), also this will be the FIRST value of x at which y is above the threshold. It's a really ambiguous question actually.

IRTFM Over a year ago

I edited it to be the y-value under assumption that res was f(x), but agree it is unclear exactly what was meant.

JeremyS · Accepted Answer · 2014-01-20 06:20:18Z

If you call the result from function y res

res_over_certain_number <- res[res > certain_number]

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