National Oceanic and
Atmospheric Administration
United States Department of Commerce

COMPRESSI_BY (and J,K,L,M,N)

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Last modified: Mon, 04/16/2018 - 17:04

COMPRESSI_BY (var, mask), Compress data according to a mask

Likewise COMPRESSJ_BY, COMPRESSK_BY, COMPRESSL_BY, COMPRESSM_BY, COMPRESSN_BY compress data on the given axis according to a mask; returning data on an abstract axis in each direction.

Arguments:

VAR

Variable to compress according to MASK
 

MASK

mask to use in compressing the data

Result Axes:

X

Abstract
 

Y

Inherited from VAR and MASK
 

Z

Inherited from VAR and MASK
 

T

Inherited from VAR and MASK
 

E

Inherited from VAR and MASK
 

F

Inherited from VAR and MASK

Compress variable "dat" along its I axis using the (multi-dimensional) mask supplied in the second argument.

For example: 

yes? LET mask = {1,,1,,1} + 0*L[l=101:102] + 0*K[k=10:11] 
yes? LIST mask
 {1,,1,,1} + 0*L[L=101:102] + 0*K[K=10:11]
 1 2 3 4 5
 1 2 3 4 5
 ---- L:101 T: 101
 10 / 10: 1.000 .... 1.000 .... 1.000
 11 / 11: 1.000 .... 1.000 .... 1.000
 ---- L:102 T: 102
 10 / 10: 1.000 .... 1.000 .... 1.000
 11 / 11: 1.000 .... 1.000 .... 1.000

yes? LIST compressi_by({11,22,33,44,55},mask)
 COMPRESSI_BY({11,22,33,44,55},MASK)
 1 2 3 4 5
 1 2 3 4 5
 ---- L:101 T: 101
 10 / 10: 11.00 33.00 55.00 .... ....
 11 / 11: 11.00 33.00 55.00 .... ....
 ---- L:102 T: 102
 10 / 10: 11.00 33.00 55.00 .... ....
 11 / 11: 11.00 33.00 55.00 .... ....