[R] warning massage longer object length is not a multiple of shorter object length

[uday]

Dear All, 

I have data set which includes details of locations e.g latitude, longitude
, time. 
I would like to compare two different data sets ( sampling in space and
time).

the e.g data sets are as follows 

t_lat
 [1] -90.00 -86.17 -82.34 -78.51 -74.68 -70.85 -67.02 -63.19 -59.36 -55.53
-51.70 -47.87
[13] -44.04 -40.21 -36.38 -32.55 -28.72 -24.89 -21.06 -17.23 -13.40  -9.57 
-5.74  -1.91
[25]   1.92   5.75   9.58  13.41  17.24  21.07  24.90  28.73  32.56  36.39 
40.22  44.05
[37]  47.88  51.71  55.54  59.37  63.20  67.03  70.86  74.69  78.52  82.35 
86.18

s_lat
 [1] -29.5074  29.0861  25.1618  24.8664  20.4859  20.6189  20.7403  20.8525 
20.9576
[10]  21.0575  21.1537  21.2477  21.3403  21.4330  21.5266  21.6224  21.7222 
21.8269
[19]  20.1911  20.3238  20.4450  20.5570  20.6620  20.7617  20.8577  20.9516 
21.0443
[28]  21.1368  21.2304  21.3263  21.4260  21.5308  21.6405  19.8963  20.0287 
20.1497
[37]  20.2615  20.3663  20.4658  20.5618  20.6556  20.7481  20.8406  20.9342 
21.0301
[46]  21.1299  21.2347  21.3445  19.6015  19.7336  19.8543  19.9659  20.0705 
20.1700
[55]  20.2658  20.3595  20.4520  20.5444  20.6380  20.7339


I have tried 
nobs<-length(s_lat)
for (i in 1:length(nobs)){lat_match<-
which(abs(sci_lat-tm3_lat[30])==min(abs(sci_lat-tm3_lat[30])))}

but I got warning massage longer object length is not a multiple of shorter
object length

So could somebody please tell me how to solve  this kind of  problem ?

Thank you 




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