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Re: basic soubt with fltarr [message #30181]

Thu, 11 April 2002 07:21

James Kuyper
Messages: 425
Registered: March 2000

Senior Member

trouble wrote:

> James,
>
> One of us has got columns and rows mixed up... are we victims of the
> column/row major format ? I think so ;)

Sorry, I do most of my work in C, so I sometimes get the terminology
reversed. Oddly enough, I almost never get mixed up about the ordering
in memory, but only about the words used to describe that ordering.

Unfortunately, it's easier to do these tricks along the last dimension
than along the first; that's intrinsic to the nature of the problem, and
not a defect of IDL itself. There are ways to do it without creating an
explicitly named temporary, but they make heavy use of transpose() to
turn the problem into a problem of concatenating along the last
dimension. That makes them significantly less efficient than the
following re-write of my original answer:
> Muks Raju wrote:
>
> Hello all...i have a basic doubt with fltarr. I have this fltarr
> Actuator = fltarr(100,4)
>
> now i need to remove the first 3 columns. How do i do this. Also i may

Actuator(3:*,*)

> need to add 3 columns at the beginning and at the end ...

newAct = fltarr(106, 4);
newAct(3:102,*) = Actuator

> ...or maybe a column
> of data in the middle.

newAct = fltarr(101,4)
newAct(0:49,*) = Actuator(0:49,*)
newAct(51:*,*) = Actuator(50:*,*)

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[Message index]

		Re: basic soubt with fltarr By: James Kuyper on Thu, 11 April 2002 07:21
		Re: basic soubt with fltarr By: the_cacc on Thu, 11 April 2002 03:43
		Re: basic soubt with fltarr By: James Kuyper on Wed, 10 April 2002 08:43
		Re: basic soubt with fltarr By: the_cacc on Wed, 10 April 2002 06:01
		Re: basic soubt with fltarr By: Muks Raju on Fri, 12 April 2002 17:43

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