Used to be a Fortran thing

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Post #120,813 by ChrisR 10/10/03 2:30:03 PM Reply	Used to be a Fortran thing Still lots of scientific stuff using Fortran. I don't know that C ever managed to equal the speed with which arrays can be processed. VB and Java have a lot of overhead that can be dispensed with - GC & boundary checking being the most obvious. For many, if not most, efficient programming can be had in these languages, but it does require attention to detail. One thing I've found is that speed is a tricky problem. Inefficiency and volume of code are not necessarily in direct correlation. You can have routines that are very inefficient but unless they are at the heart of the speed problems, they don't cause a significant degradation. Then again, you can have a routine that is fairly tight be the culprit because it is directly in the path of bottleneck.
Post #120,839 by deSitter 10/10/03 5:59:21 PM Reply	Re: Used to be a Fortran thing Very true about speed - my APL mumerical codes tend to be as fast as the C codes, because the primitive operations like inverting a matrix are lightning fast in APL (100x100 matrix is nearly instantaneous on a 300 Pentium). C has always sucked as an idiom for math, and more or less still does. The one reason I maintain an interest in C++ is that is makes a better idiom for math. -drl
Post #120,855 by tuberculosis 10/10/03 7:16:11 PM Reply	Yep -FORTRAN for math libs rulez Pity about Raytheon paying a couple friends of mine to rewrite their FORTRAN math lib in C++. Don't think it ever worked as well as before. In Java, you can't escape the creepy feeling. --James Gosling
Post #120,864 by deSitter 10/10/03 7:35:43 PM Reply	Re: Yep -FORTRAN for math libs rulez It's the old bugbear, copying of values. For bizapps this can be minimized, but in numeric codes, a naive approach can result in implicit copying of enormous blocks of floats, so the program spends most of its time doing stupid busywork. -drl

I'm having a problem grokking C - (jake123) - (61) - Oct. 7, 2003, 08:34:16 PM EDT

"\\0" is a string - not a character - (ChrisR) - (54) - Oct. 7, 2003, 08:42:18 PM EDT

Re: "\\0" is a string - not a character - (jake123) - (23) - Oct. 7, 2003, 08:57:21 PM EDT

Double quotes is a string: - (ChrisR) - Oct. 7, 2003, 09:09:59 PM EDT

You want to use '0' not "0". - (a6l6e6x) - (21) - Oct. 7, 2003, 09:16:16 PM EDT

Thanks guys - (jake123) - (20) - Oct. 7, 2003, 10:25:03 PM EDT

sheesh, wackiness - (jake123) - (17) - Oct. 7, 2003, 10:54:30 PM EDT

operator precedence -NT - (deSitter) - (3) - Oct. 7, 2003, 11:01:11 PM EDT

According to my text - (jake123) - (2) - Oct. 8, 2003, 12:11:44 AM EDT

use "unsigned char" - (deSitter) - Oct. 8, 2003, 12:25:50 AM EDT

Re: According to my text - (Arkadiy) - Oct. 8, 2003, 03:31:57 AM EDT

Should be equivalent indeed - (Arkadiy) - (12) - Oct. 8, 2003, 03:09:52 AM EDT

Well, interestingly enough - (jake123) - (11) - Oct. 8, 2003, 03:53:42 AM EDT

Re: Well, interestingly enough - (Arkadiy) - (10) - Oct. 8, 2003, 08:49:08 AM EDT

Yes, I was sure. -NT - (jake123) - (9) - Oct. 8, 2003, 08:48:57 PM EDT

copy/paste the full code, then -NT - (Arkadiy) - (8) - Oct. 9, 2003, 07:07:56 AM EDT

Sure, here's my final version - (jake123) - (7) - Oct. 10, 2003, 12:59:17 PM EDT

Works with or without parens for me - (Arkadiy) - (4) - Oct. 10, 2003, 08:45:17 AM EDT

Feel free - (jake123) - (3) - Oct. 10, 2003, 10:49:06 AM EDT

Re: Feel free - (Arkadiy) - (2) - Oct. 10, 2003, 04:09:28 PM EDT

You're suggesting that - (jake123) - (1) - Oct. 13, 2003, 11:59:46 AM EDT

Basically, yes - (Arkadiy) - Oct. 13, 2003, 12:48:50 PM EDT

Works here too, both ways. gcc 3.3.2 -NT - (scoenye) - (1) - Oct. 10, 2003, 01:50:05 PM EDT

It is working here - (jake123) - Oct. 10, 2003, 03:25:25 PM EDT

What is the type of 'value1' ? - (jb4) - (1) - Oct. 8, 2003, 01:28:43 PM EDT

Nah, it's an int - (jake123) - Oct. 8, 2003, 08:48:05 PM EDT

NOT better! - (jb4) - (29) - Oct. 8, 2003, 01:23:06 PM EDT

Think we've had this argument before - (ChrisR) - Oct. 8, 2003, 02:04:42 PM EDT

Agreed -NT - (deSitter) - Oct. 8, 2003, 03:34:13 PM EDT

NOT boolean - this is C - (tuberculosis) - (25) - Oct. 8, 2003, 10:22:43 PM EDT

Re: NOT boolean - this is C - (deSitter) - (1) - Oct. 9, 2003, 12:53:53 AM EDT

Nah, put on your binary thinking cap. :) - (a6l6e6x) - Oct. 9, 2003, 07:39:39 AM EDT

Yes, yes...agreed - (jb4) - (22) - Oct. 10, 2003, 11:18:37 AM EDT

Breaking bad habits - (ChrisR) - (21) - Oct. 10, 2003, 12:20:29 PM EDT

Good points... - (jb4) - (15) - Oct. 10, 2003, 12:50:20 PM EDT

Not that I do a tremendous amount of C programming... - (admin) - (4) - Oct. 10, 2003, 01:14:34 PM EDT

K&R - (ChrisR) - Oct. 10, 2003, 02:20:54 PM EDT

My mileage varies. :-) - (static) - Oct. 10, 2003, 06:32:52 PM EDT

They are all ugly - (tuberculosis) - (1) - Oct. 10, 2003, 06:59:15 PM EDT

Yep. - (admin) - Oct. 10, 2003, 07:19:31 PM EDT

The business seems to have plenty of time on its hands - (ChrisR) - (9) - Oct. 10, 2003, 01:50:13 PM EDT

Disagree with several of your premises - (jb4) - (8) - Oct. 10, 2003, 06:39:40 PM EDT

Dude - (tuberculosis) - (7) - Oct. 10, 2003, 07:15:05 PM EDT

Which reminds me - C++ is why our hardware sucks (new thread) - (tuberculosis) - Oct. 10, 2003, 07:34:32 PM EDT

rofl - (deSitter) - Oct. 10, 2003, 07:38:05 PM EDT

Heh - (jake123) - Oct. 10, 2003, 10:31:25 PM EDT

Dude... - (jb4) - (3) - Oct. 12, 2003, 11:42:07 AM EDT

Whoa, JB gets feisty! - (deSitter) - Oct. 12, 2003, 04:03:23 PM EDT

Non-sequitur - (tuberculosis) - (1) - Oct. 12, 2003, 06:42:01 PM EDT

OK, then apology accepted........;-) - (jb4) - Oct. 12, 2003, 10:39:06 PM EDT

I'd have to agree - (jake123) - (4) - Oct. 10, 2003, 12:56:42 PM EDT

Used to be a Fortran thing - (ChrisR) - (3) - Oct. 10, 2003, 02:30:03 PM EDT

Re: Used to be a Fortran thing - (deSitter) - (2) - Oct. 10, 2003, 05:59:21 PM EDT

Yep -FORTRAN for math libs rulez - (tuberculosis) - (1) - Oct. 10, 2003, 07:16:11 PM EDT

Re: Yep -FORTRAN for math libs rulez - (deSitter) - Oct. 10, 2003, 07:35:43 PM EDT

Misra C guidelines - (ChrisR) - Oct. 18, 2003, 12:47:25 AM EDT

Ob-C advice - (deSitter) - Oct. 7, 2003, 10:54:06 PM EDT

Stylistic tip - (ben_tilly) - Oct. 8, 2003, 10:26:26 AM EDT

Re: I'm having a problem grokking C - (tuberculosis) - (3) - Oct. 8, 2003, 06:55:58 PM EDT

Hehehe - (jake123) - (2) - Oct. 8, 2003, 08:47:17 PM EDT

int isdigit(int c) { return (c >='0' && c <= '9'); } - (tuberculosis) - (1) - Oct. 8, 2003, 10:21:03 PM EDT

:) - (jake123) - Oct. 9, 2003, 02:50:50 AM EDT

I think coming back from the summit was the rather more important achievement.
151 ms