curr_index

Format:

curr*_index( scan_id)

Result:

Number

Description:

Returns the current index of a SCAN or ARRAY. That is the number of valid points. Total() returns the upper limit. Normally the current index is equal to total(). There are operations, like CUT and KEEP for example, which create SCANs with smaller current indices.

This function can also be used to set the current index.

e.g.:

SPECTRA> * = curr_index(bpu1)
222

SPECTRA> curr_index(bpu1) = 100

SPECTRA> display

Mind that the current index is implicitly set, if a single x- or y-value of a SCAN/ARRAY is changed, e.g.: bpu1(123) = 12. This command sets the 123$th$ y-value of BPU1 to 12 and changes the current index to 123.