FC_ISUBSET

Appendix A

FC_ISUBSET(index_list, lengths, nx, FullData) Returns a subset of a feature collection

 

 

Concatenates the values of two variables into one list on an abstract E axis.

 

 

Arguments:	Index_list	Starting indices of the features of interest
	lengths	Lengths of the features of interest
Arguments:	nx	length of result (sum of lengths in argument 2)
Arguments:	FullData	input data: 1D list from which to select features
Result Axes:	X	CUSTOM: length is the sum of the lengths in arg 2
	Y	NORMAL
	Z	NORMAL
	T	NORMAL
	E	NORMAL
	F	NORMAL

Note:
This is a grid-changing function. It is generally advisable to include explicit limits when working with functions that replace axes.

Example:

Define a list which represents several features:Feature 1 starts with index 1, Feature 2 starts with index 2, Feature 3 starts with index 9.

yes? let alldata = {1,2,3, 31,32,33,34,35, 101,102,103,104,105,106}
 
! Pick out the second and third features.
yes? let indexlist = {4,9}
yes? let lengths = {5, 6}
yes? let nx = `lengths[x=@sum]`
yes? let fci = fc_isubset(indexlist, lengths, nx, alldata)
yes? list fci
VARIABLE : FC_ISUBSET(INDEXLIST, LENGTHS, NX, ALLDATA)
SUBSET : 11 points (X (X))
1 / 1: 31.0
2 / 2: 32.0
3 / 3: 33.0
4 / 4: 34.0
5 / 5: 35.0
6 / 6: 101.0
7 / 7: 102.0
8 / 8: 103.0
9 / 9: 104.0
10 / 10: 105.0
11 / 11: 106.0
 

Note that a similar thing could be accomplished by calling EXPNDI_BY_Z_COUNTS or EXPNDI_BY_M_COUNTS and then applying a mask in the Z or E direction.