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How to speed up code which checks lots of values of an array [message #74367]

Thu, 13 January 2011 08:06

Robin Wilson
Messages: 40
Registered: August 2010

Member

Hi all,

I've been writing some code which checks that all of the values in one
half of an array are less than a threshold, and all of the values on the
right half of an array are greater than a threshold. I've written the
code below, which seems to be a fairly clean way of writing it, and
works for any length of array (which is important for my use of it).

However, it's not very fast. I wondered if it might be able to be sped
up using some sort of magic like the Histogram command... Any ideas?

---CODE---
; Assume we're given a 1D array called line with our values in it

len = N_ELEMENTS(line)

section_len = (len - 1) / 2

; Get the left-hand half of the array
LHS = line[0:section_len - 1]
RHS = line[section_len + 1: len - 1]

res = WHERE(LHS GT 180, LHS_count)
res = WHERE(RHS LT 180, RHS_count)

IF LHS_count EQ 0 AND RHS_count EQ 0 THEN BEGIN
; Do stuff
ENDIF

---END CODE---

Cheers,

Robin

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[Message index]

		How to speed up code which checks lots of values of an array By: Robin Wilson on Thu, 13 January 2011 08:06
		Re: How to speed up code which checks lots of values of an array By: JDS on Tue, 18 January 2011 15:32

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