How did you learn about performance issues?

I've been thinking about trying to get a LV certification, so I tried out the online test, and I've got a few questions about learning LV on a deeper level.
One question asked whether it is more efficient to cast each piece of an array as its being built in a for loop, or to cast the entire array at once, after the array has been created.
Another question asked, if array indexing is enabled on the output of a while loop then is the array resized on every iteration?
I can make guesses at how LV works, but I really don't know what goes on under the hood. How do you pros know what's really going on with your code?
Also for anyone out there who has been certified, can you pass the test with just experience, or do you have to undergo some NI training to learn some things? Has LV certification been beneficial to you?
Thanks,
John

Hi John,
I have mentored 2 1/2 CLA's (the 1/2 is the "Architect Supreme" and she really only needed encouragement).
Here are my suggestions.
1) Study for the test you plan to take. Studying above the test level you are after can only confuse things.
2) If you can get the funding, take the NI courses suggested for that test. Some of the Q's come from the text.
3) Monitor this Exchange for questions regarding performance and speed.
4) Use the search box at the top of this page and search for "Greg McKaskle". Some of the best performance info available is in his writtings.
5) Use the "info-LabVIEW" serach engine that can be found at
http://www.searchview.net/
and search fro Greg McKaskle and Rolf Kalbermatter. Again great information.
6) Make a habit of using the "Task manager>>> Performance screen while you are devloping and testing. It is a good way to find out what things are good and which are bad. You find out subtle things like straight line interpolation on a chart is faster than step interpolation.
7) Read all of the LV release notes. The questions you posted are answered in those docs and changed in LV 6.0.
8) Review the LabVIEW ZONE challenges. They are competitions based on performance. Read the reviews.
9) Read the white papers. Do not miss 144!
10) Start posting Q's on this Exchange. Let us expert (myself excluded) that prowl this list help out.
Done for now,
Ben
Ben Rayner
I am currently active on.. MainStream Preppers
Rayner's Ridge is under construction

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How did YOU learn Java?

Ok, two part question and a bunch of help for this Java newbie:
1. How did you learn Java? Online tutorials, books, discussions, a game, or a class? Be specific and think back to when you looked at a Java program and went "wtf?"
2. How do you keep up the new versions and therefore, useless older classes? I am reading the list on JDK 1.4 and just thinking, how could I remember all of this? If I'm used to programming one way, how can I relearn for every version?
If I could just get some honest answers and opinions, it'd be greatly appreciated, Thanks!

Get this:
I originally 'learned' Java from "Java Made Simple" by Peter McBride. "Made Simple" is right: having finished this book, I had no idea that you could design your own classes for use by other classes! All my methods were static, I'd never written a constructor or instantiated one of my own classes, and my applications were all contained in a single class! I had only the vaguest notion of what "object oriented" meant, and I wondered why, for example, you had to say
Integer x = new Integer(4);
but not
int x = new int(4);
The book was intended, I think, for non-programmers who have been given some free space by their ISP to design a web page, and want to add some v. simple applets for decoration. Beware of books like this if you want to learn Java in a serious way.
For a more positive tip, I recommend Sun's very own online Java Tutorial. It covers all the key topics thoroughly and clearly, so at the end you have a good understanding of Java (More than just the basics, I'd say). If you want to move on to more advanced topics this tutorial will probably stand you in good stead (I can't be certain as I haven't moved on from here yet myself), but if you don't you will still be able to write good amateur programs.

How did you feel about your first mac?

As an early christmas present I received a 13 inch macbook air, 2GB RAM and 1.86GHz dual core cpu.
I am mostly used to PC laptops running linux or often I put solaris on them. I study Computer Science and have Asperger's Syndrome.
I got my mac as windows had too much bloatware and Linux was too unstable on my 64-bit hardware (needed 6 GiB RAM for large compilations). I was going to use the macbook air to take notes and some minor work between classes such as writing assembly subroutines, C and java. The primary use of this system was going to be as a personal assistant to have my calendar and files etc.
The system is so powerful with a full 12 hours battery life when working on the localhost that it can out-do a 2.4GHz dual core with 6 GiB RAM PC running any OS. This system is now used for all my work due to it's capabilities and portability. After only one week with a mac I dont know how I lived without one, and my carer says it has made me show immense improvements day-to-day. I am now tempted to learn Objective-C as well as how to use Cocoa from Python to be more efficient, especially after seeing the perfection in this system.
How did you feel when you got your first mac?

A related question might be, what did you think about the introduction of the IBM PC?
I had been designing digital systems and working with computers for a few years before the PC's introduction in 1981. The mainstay systems were 8 bit Z80 or 8085 machines running at 4 or 6 MHz. They ran CP/M with its command line interface. Although the maximum memory these systems could use was 64 MB, being a single user, single-task operating sytem, even the most resource-hungry programs (word processors for instance) ran very fast. CP/M itself needed only a few K.
Dual floppy disk systems were common, 180 KB per disk unless you had double sided floppies - 360 K. The A drive booted the operating system, after which you could insert a program disk. The B drive held your data. I had one machine with a whopping 5 MB hard disk - the C drive. I treated it with special reverence.
When rumors began about IBM producing its version of a desktop PC, many people including myself had grand expectations. Clearly Big Blue would emerge as the leader in desktop computers, since they had the resources to dictate what the standard would be. Everyone knew the others would be left in the dust. What kind of processor would it use? How much memory? Would it have a slimmed down version of the multiuser, multitasking operating system used in its System/34 minicomputer? Or would it resemble something that DEC used in its PDP-11?
Well, when the IBM PC came out in 1981, needless to say it was an enormous disappointment. It wasn't much better than anything else I had already been using for three or four years already, except the PC was much, much more expensive. No hard disk unless you wanted to buy an upgraded power supply (more $$$) and then all they offered was 10 MB. Forget about multiple users or multitasking. It didn't even have the equivalent of CP/M's PIP. The whole thing seemed... intentionally crippled. This was supposed to be the future of computing? In my opinion it was a major step backward. The XT that followed it offered only minimal improvements. I rejected the IBM PC as not cost effective and kept using my CP/M dinosaurs.
So, when Apple introduced the Macintosh a couple years later I finally saw, in the flesh, what I thought a computer ought to be. A totally bit mapped display, a robust 16/32 bit processor, real sound capability (everything before it could only "beep") and a true graphical UI. You could name a file anything you want, no 8x3 idiocy. +To this day+ Windows carries remnants of 8x3 filenames!
The Macintosh blew away the PC, if not in performance, in its potential. Unlike the "crippled" PC the Mac seemed limitless. This was cool. The Mac wasn't without limitations though - there was no good way to install a hard disk for instance - but for some reason I considered those limitations trivial and believed they would be overcome in the near future. I waited for the first "upgrade" - the "Fat Mac" with a whopping 512K memory. Half a megabyte!
I used that computer for several years, until the SE/30 came out, which I kept in service for about ten years. I ultimately expanded its memory to 32 MB while PC users were struggling with extended memory or expanded memory - you had to know which was which - to get beyond the PC's stupid 640K barrier. My 30 MB HD eventually grew small, but that was easily remedied with an external SCSI drive. Although the computer did everything I ever expected it to do, the Internet eventually made it functionally obsolete. It could run a browser (forget which one) but the black and white limitation made it marginally useful.
I eventually replaced it with an iMac, which echoed the original Mac's introduction with its forward-thinking design. The iMac opened up a new world in much the same way the original Macintosh did in 1984.
All my Macs still work.
yoshitaka wrote:
... After only one week with a mac I dont know how I lived without one, and my carer says it has made me show immense improvements day-to-day.
That pretty much sums it up.
In retrospect, I believe that IBM and its marriage of convenience with Microsoft delayed the evolution of desktop computing a decade or more. I cringe whenever I think of the aggregate productivity loss and utter frustration shared by millions of PC / Windows devotees all these years.

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gemsmobiletans wrote:
my phone does not have software update option on it.
If you have iOS 4... See Here...
http://support.apple.com/kb/HT4972
OR...
Connect to iTunes on the computer you usually Sync with and “ Check for Updates “...
If an Update Appears Install it... if not... you are up to date for your particular Device...
See the Using iTunes Section Here...
How to update your iPhone, iPad, or iPod touch
Make sure you have the Latest Version of iTunes Installed
iTunes free download from www.itunes.com/download
Note:
The Current iOS for the iPhone 4s is iOS 7.

How did you learn flash?

I have never created a website before and I want to know if
Flash will help me accomplish my goal.
I am having a devil of a time locating tutorials and books
that can help me learn what I need to know in Flash CS3.
Most of what I find is for Flash 8. I have yet to find any
tutorial to make a map like map quest that I can grab move and zoom
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Hello ...99% of flash 8 tutorials can be used in Flash CS3
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Script stuff
& its ability to import complete AI & Photoshop
files,
dont let ActionScript 3 scare you, because it scared me at
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but now that Flash has resolved most of it's Action Script
stuff
iam sure the Flash Team will have more time now
to finally put in the long awaited 3D tools ! ;o) ..then it
will be basically capable of anything
if you want to create a map quest as you say , that will have
interaction
then you will need to learn at least the basics of
actionscript & behaviors
other than that , if you are an artist & animator , then
Flash is the best api for that
check out cartoonsmart.com & mudbubble.com to get an idea
of the drawing power of Flash ..from there on its all up to your
imagination my friend
the best resource book for newbies is the Help & Live
Docs of Flash
but there are many out there that have dedicate alot of time
creating free tutorials
also another site you might want to check out , i think it
will give you some great idea's of what you are interested in
creating is ...www.hungrysuitcase.com ;o)
peace John

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Understanding Restrictions > http://support.apple.com/kb/HT4213

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HT1386 hiya ive recently got the iphone4s and have been trying to register it onto the itunes on my laptop but it wont do this for some reason, has anyone else had any problems doing this and if so how did you resolve the issue ? many thanks yvonne

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Hello Sandylynn,
After reviewing your post, it sounds like you can connect the device with Bluetooth and make and receive calls but they dont hear you. I would recommend that you read this article, it may be able to help the issue.
If your voice is too faint or sounds unclear using iPhone, or iPod touch - Apple Support
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Wond

How did you learn about performance issues?

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