R help - Apr 2014 - locating a data value in 3-dimensional data set

I have a 3-dimentional data set with dimensions "longitude",
"latitude", and "time". Unfortunately, when I look at the
range of
values in the data set, I noticed some very extremely large(positive
and negative) values which are unexpected to be there. So I wanted to
point-out the location (lon, lat and time) which these extreme values
correspond to in order to see what is happening there. But I could not
point-out these grid points and time.

I tried:
which(3ddata==x) # 3ddata is name of data set, x is the observed extreme value
But this couldn't help me.

Any suggestion please?

Thanks

B

> I tried:
> which(3ddata==x) # 3ddata is name of data set, x is the observed extreme
> value But this couldn't help me.
You'll need which(3ddata$long==x) if 3ddata is a data frame* with columns
long, lat, time, or something like 3ddata[ ,'long'] if it's a matrix
with dimnames or [,1] if just a matrix.

But you'll be better off with >=x if the values are floating point; see R
FAQ 7.31

*clearly, '3ddata' cannot be a data frame name - it's not legal R. I
assume you have some legal name for it.




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Dear Mamuash Bukana,

is this a data frame with variable names you indicated?

you will need something like which(dataframename$variablename == x) 
but if you have more you might use >

HTH
kd
________________________________________
Felad?: r-help-bounces at r-project.org [r-help-bounces at r-project.org] ;
meghatalmazó: mamuash bukana [mamushbukana at gmail.com]
K?ldve: 2014. ?prilis 8. 15:50
To: r-help at r-project.org
T?rgy: [R] locating a data value in 3-dimensional data set

I have a 3-dimentional data set with dimensions "longitude",
"latitude", and "time". Unfortunately, when I look at the
range of
values in the data set, I noticed some very extremely large(positive
and negative) values which are unexpected to be there. So I wanted to
point-out the location (lon, lat and time) which these extreme values
correspond to in order to see what is happening there. But I could not
point-out these grid points and time.

I tried:
which(3ddata==x) # 3ddata is name of data set, x is the observed extreme value
But this couldn't help me.

Any suggestion please?

Thanks

B

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