[R] Searching up a list of values

[Rui Barradas]

Hello,

Try the following.

idx <- B$ID %in% A
B[idx, ]

In the case of your data example, the return value is 0 rows. (No matches)

Also, the best way to post a data example is using ?dput

dput( head(B, 30) )  # copy & paste the output of this

Hope this helps,

Rui Barradas
Em 27-10-2012 07:07, Jeremy Ng escreveu:
> Dear list,
>
> Sorry if this is a really simple question to ask, but I have been stuck at
> this for some time and have no luck so far.
>
> I have 2 data files- a file containing IDs which I am interested in (maybe
> about 20 of them)- lets call this file A, and another file containing all
> the IDs (which is more than 1 million) and the corresponding expression
> values- lets call this file B.
>
> So for example, this is how file B looks like:
>
> 2534215 4.73483 3.06499 0.70032 2.20247 2.57014 2.68004 5.20362 4.56531
> 5.53275 4.6597 4.49301 3.26696 4.45926 3.33294 4.91008 4.69106 2.80828
> 3.85168 4.31348 3.84926
> 2620456 7.13062 7.40361 7.41215 7.12816 6.03347 7.77204 8.37129 8.4811
> 8.4156 8.48804 8.33357 7.77168 7.60426 7.0769 8.06268 7.4646 6.29976 6.76743
> 7.41375 7.30186
> 2830090 0.54261 2.14015 2.30475 1.85821 0.46711 0.92093 0.77438 0.94734
> 0.68643 0.57625 0.72098 0.988 2.11342 0.4447 0.3774 0.67744 2.0072 1.90465
> 0.87868 0.5177
> 2575215 3.40684 2.08213 1.69333 3.01074 2.28529 1.9541 2.14518 1.67518
> 2.83476 3.28296 2.21263 2.46864 3.30994 2.42013 5.22249 1.98937 2.09089
> 1.94941 2.43488 3.59808
> 2849041 1.48954 3.91934 1.7037 1.77033 1.54604 0.93467 0.96066 2.24328
> 2.92171 2.15935 0.42652 1.46658 1.49061 1.72481 1.09684 0.98344 1.83167
> 2.10103 2.40971 0.84771
> 3102546 5.88775 5.67887 5.42377 3.45853 4.99174 3.04696 5.29118 4.43669
> 5.18792 5.34072 5.06025 3.25504 5.50719 5.92674 4.71267 5.51699 3.54069
> 5.28343 6.36131 4.7219
> 2925428 1.55075 1.74401 2.07019 2.13188 0.8098 1.40341 0.99192 1.39257
> 0.51152 2.50187 1.39294 1.29555 0.67688 1.2912 1.75177 1.61535 1.31611
> 0.91411 1.1937 0.79358
> 2372272 7.69508 7.32337 7.47569 7.13584 5.86709 6.15057 8.03573 7.77657
> 7.93019 7.6854 8.23643 3.42619 8.90083 9.18137 8.54825 7.39468 7.88283
> 8.08621 8.41234 8.23991
> 3360788 1.8126 3.57725 1.68462 2.83186 2.29188 1.723 2.27151 3.57716 3.12974
> 1.7842 2.49073 3.42127 1.52801 2.43608 2.38312 4.10846 2.34492 1.68719
> 0.87868 2.5681
> 3443892 6.03618 5.53088 3.59312 2.43822 4.67525 2.89741 3.57465 3.25502
> 3.30023 3.06377 3.4388 2.31478 4.74265 5.6276 2.82511 4.8615 5.65537 5.93262
> 6.29311 6.13882
> 3298798 1.16559 2.3974 1.28858 0.566 0.74531 0.93919 2.68312 1.20792 1.48076
> 1.69595 1.67204 0.5811 1.02014 0.84925 1.54777 1.30054 2.14382 3.31986
> 1.19556 2.7532
> 3019819 1.73561 3.53995 2.28098 1.91677 3.64978 2.23223 2.39018 1.66967
> 2.60563 2.82343 3.60435 1.7998 1.10665 1.42922 1.60167 1.39237 3.08337
> 1.07063 2.08086 1.9265
> 3173936 1.55062 1.50538 1.87352 1.83726 3.59104 2.50134 0.71658 2.07377
> 1.50345 2.71367 1.68669 2.05536 1.88829 0.86234 0.80113 2.2544 0.86643
> 2.03882 1.53434 1.46399
> 2424908 0.42785 1.66894 2.27908 2.99882 3.284 1.99961 0.79164 0.44145
> 1.40957 2.05127 1.40553 3.38542 0.82951 1.06653 1.43876 2.15272 0.69042
> 0.66962 2.02502 0.7646
>
> And this is how file A looks like:
> 2620456
> 2830090
> 2575215
> 2849041
>
> How do I actually extract and export the corresponding values for A in B?
>
> Thanks in advanced!
> Jeremy
>
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>
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