zhijie zhang wrote: > Dear Friends, > I want to extract the records from A according to B, but the results are > not correct because R says : > The length of long object is not integer times on the length of short > object. > Anybody have met the same problem? How to do it correctly? > > length(A)=47 > length(B)=6 > > A[A$coords.x1==B$X1,] #the program for the above task. I should get 6 > records, but i only get former 4 records for the above reason. > > Thanks.
A[A$coords.x1 %in% B$X1,] coords.x1 coords.x2 1 542250.9 3392404 8 541512.5 3394722 9 541479.3 3394878 10 538903.4 3395943 19 543274.0 3389919 20 543840.8 3392012 ?is.element > The folloing shows dataset A and B. > > >> A > coords.x1 coords.x2 > 0 542250.89 3392404.1 > 1 538813.87 3388339.0 > 2 536049.19 3385821.6 > 3 533659.62 3383194.2 > 4 530642.30 3376834.9 > 5 529573.15 3378177.8 > 6 530853.82 3394838.8 > 7 541512.51 3394721.6 > 8 541479.33 3394877.8 > 9 538903.39 3395942.5 > 10 536019.95 3396286.1 > 11 538675.23 3384213.2 > 12 535127.95 3381255.4 > 13 533852.24 3378660.4 > 14 531360.91 3379273.8 > 15 539289.14 3375759.8 > 16 543410.51 3384353.1 > 17 543089.27 3388170.1 > 18 543274.03 3389919.2 > 19 543840.77 3392012.4 > 20 553383.55 3402401.8 > 21 554621.51 3397938.9 > 22 564096.42 3397524.4 > 23 567529.64 3398702.9 > 24 561798.76 3404864.0 > 25 562868.34 3405502.2 > 26 563145.22 3403192.1 > 27 562419.87 3404090.4 > 28 558321.85 3403879.9 > 29 567050.74 3404973.1 > 30 570609.70 3408742.4 > 31 556777.57 3397858.0 > 32 531353.38 3368596.6 > 33 533513.50 3372749.3 > 34 537543.19 3364284.8 > 35 538779.41 3368224.8 > 36 525930.09 3374067.7 > 37 522990.85 3369213.1 > 38 528826.37 3359019.0 > 39 533865.85 3362595.4 > 40 531200.25 3365053.0 > 41 551054.10 3377181.3 > 42 546974.19 3369284.8 > 43 572315.59 3359541.1 > 44 562703.63 3355173.4 > 45 558959.31 3357804.4 > 46 558531.39 3361741.1 > > >> B > X1 X2 > 1 542250.89 3392404.1 > 2 541512.51 3394721.6 > 3 541479.33 3394877.8 > 4 538903.39 3395942.5 > 5 543274.03 3389919.2 > 6 543840.77 3392012.4 -- Chuck Cleland, Ph.D. NDRI, Inc. 71 West 23rd Street, 8th floor New York, NY 10010 tel: (212) 845-4495 (Tu, Th) tel: (732) 512-0171 (M, W, F) fax: (917) 438-0894 ______________________________________________ [email protected] mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
