Note: even if I say by=c("LON", "LAT"), it doesn't work, suggesting that
number storage isn't the problem
On Wed, Aug 26, 2009 at 6:19 PM, Mehdi Khan <mwk...@ucdavis.edu> wrote:
> Hello everyone,
>
> Merging two dataframes should be easy. However when I try to merge, R
> doesn't recognize identical values, even if I am doing it by values that
> have no decimals.
>
> willclayong:
> vs30 LON LAT Net X wills.cat wills.vs30 clahan.cat clahanvs30
> PolyID.wills PolyID.clahan tif.cat STA ELEVATION tif.vs30
> 1 338.539 -3849590 4319319 <NA> 2 D 301 D
> 377 1958 1942 1 150 NA 519
> 2 712.822 -3849590 4319319 <NA> 3 D 301 D
> 377 1958 1942 1 479 NA 519
> 3 477.652 -3836584 4288164 <NA> 10 C 464 C
> 489 1194 9353 3 148 NA 547
> 4 513.703 -3836575 4287739 <NA> 11 C 464 C
> 489 1194 9353 3 485 NA 547
> 5 477.652 -3835886 4289120 <NA> 12 C 464 C
> 489 1194 9353 7 147 NA 388
>
> wald:
>
> > wald_ol_sta[1:10,]
> X Wald.vs30 STA vs30 LON LAT
> 1 1 434.417 1502 274.500 -3077929 3759564
> 2 2 378.049 NEE2 363.000 -3086165 3718184
> 3 3 196.848 EMS 336.000 -3143337 3500449
> 4 4 557.625 1498 659.600 -3103738 3871531
> 5 5 263.878 1497 274.500 -3102944 3878068
> 6 6 374.898 1499 274.500 -3109753 3858460
> 7 7 150.000 230 274.500 -3154048 3482703
> 8 8 248.342 1205 207.469 -3153294 3497116
> 9 9 422.256 1495 338.600 -3097854 3990339
> 10 10 322.540 1496 274.500 -3115300 3863905
>
> willsclayongwald<-merge(wald_ol_sta, willsclayong, by=c("LON", "LAT",
> "STA", "vs30"))
>
> returns nothing... if I modify the previous script by adding "all=TRUE", I
> get this:
>
>
> lsclayongwald[1:10,]
> LON LAT STA vs30 X.x Wald.vs30 Net X.y wills.cat
> wills.vs30 clahan.cat clahanvs30 PolyID.wills PolyID.clahan tif.cat
> ELEVATION tif.vs30
> 1 -3854850 4321856 478 513.703 1155 586.685 <NA> NA
> <NA> NA <NA> NA NA NA
> NA NA NA
> 2 -3849590 4319319 150 338.539 NA NA <NA> 2 D
> 301 D 377 1958 1942 1 NA
> 519
> 3 -3849590 4319319 479 712.822 NA NA <NA> 3 D
> 301 D 377 1958 1942 1 NA
> 519
> 4 -3849590 4319319 150 338.539 1152 336.794 <NA> NA
> <NA> NA <NA> NA NA NA
> NA NA NA
>
>
> rows 2 and 4 should have merged. Why didn't they?
>
>
> thanks!
>
>
> Mehdi Khan
>
>
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