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From: Vikas Bajpai on 21 Apr 2010 02:09
I made a program which performs a particular operation on an image as
a whole and this program takes 2.59 seconds to execute but when i
performed the same operation by dividing the image in four equal
halves then program took 0.11 seconds. Why this thing is happening as
this doesn't sound practically feasible ?
From: Rune Allnor on 21 Apr 2010 05:21
On 21 apr, 08:09, Vikas Bajpai <vikas.bajpa...(a)gmail.com> wrote:
> I made a program which performs a particular operation on an image as
> a whole and this program takes 2.59 seconds to execute but when i
> performed the same operation by dividing the image in four equal
> halves then program took 0.11 seconds. Why this thing is happening as
> this doesn't sound practically feasible ?

"Four equal halves"?

As for matlab, it *is* slow. That's the way it is. You as user
get the benefits of simple-to-use functions. The price you pay
is slow run-time performance.

It is not unusual to see speed improvements on the order of 10x,
50x, or even 100x when porting a matlab program to some other
programming language. But of course, one needs to know how to
program that other language to obtain those improvments. Which
means one needs to spend a lot of time (years) learning and
training, to master those other languages.

Rune
From: Vikas Bajpai on 21 Apr 2010 05:52
On Apr 21, 2:21 pm, Rune Allnor <all...(a)tele.ntnu.no> wrote:
> On 21 apr, 08:09, Vikas Bajpai <vikas.bajpa...(a)gmail.com> wrote:
>
> > I made a program which performs a particular operation on an image as
> > a whole and this program takes 2.59 seconds to execute but when i
> > performed the same operation by dividing the image in four equal
> > halves then program took 0.11 seconds. Why this thing is happening as
> > this doesn't sound practically feasible ?
>
> "Four equal halves"?
>
> As for matlab, it *is* slow. That's the way it is. You as user
> get the benefits of simple-to-use functions. The price you pay
> is slow run-time performance.
>
> It is not unusual to see speed improvements on the order of 10x,
> 50x, or even 100x when porting a matlab program to some other
> programming language. But of course, one needs to know how to
> program that other language to obtain those improvments. Which
> means one needs to spend a lot of time (years) learning and
> training, to master those other languages.
>
> Rune

no sir i have implemented the second program in Matlab as well the
only thing change which i have made is that initially i was performing
a particular operation on the image as a whole and later i implemented
the same technique bu dividing the image in four equal halves and
found such a drastic change in the elapsed time.
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