the_cacc's articles:

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Source for reverse_indices 2 37 (8/9/2005 11:02:24 PM) comp.lang.idl-pvwave I've been looking on the web for a C (or any!) code of histogram that does the same thing as reverse indices. Without luck, I might add. Does anyone know where I can find it? ... the_cacc

Convolution kernel for derivative in 2D 1 69 (6/16/2004 6:21:40 PM) comp.dsp The derivative of a 1D signal can be obtained from convolution with the kernel [1 -1]. To get the derivative of a 2D image, can someone help me with what the kernel is - something like [1 -1] [-1 1]? I guess.... the_cacc

IDL in 2004 0 69 (1/9/2004 8:00:06 AM) comp.lang.idl-pvwave Anyone care to predict the direction IDL will go this year? For what it's worth, I've made the move to matlab since I didn't feel IDL could compete on numerical tasks. Got to say, the idl newsgroup is more fun... the_cacc

Hyperthreading 1 49 (10/28/2003 8:51:57 PM) comp.lang.idl-pvwave I'm about to purchase a new machine - has to be windows. I was just browsing around the specs on new machines I see there is a (marketing) revolution called hyperthreading. From what I understand, it mimics th... the_cacc

Delete COMMON 6 52 (10/27/2003 4:25:45 PM) comp.lang.idl-pvwave I've been running a program with a COMMON block. To delete is, it seems that .reset is the only option. However, I *always* seem to forget to do it so it's only after 1/2 hour of processing, when the results ar... the_cacc

Non-zero diagonals for sparse format 0 45 (10/23/2003 6:12:38 PM) comp.lang.idl-pvwave Hi, Suppose you have a matrix with lots of zero elements: IDL> n = 100 IDL> A = randomu(1,n,n) * (randomu(2,n,n) GT 0.95) IDL> print,total(A EQ 0) 9449.00 Normally you don't have the full matrix A but o... the_cacc

Dynamic memory or...? 4 24 (10/22/2003 7:45:52 PM) comp.lang.c++ Hi, I have a program that needs to reserve about 1 to 10 Mb of memory every time it's run. Only one instance of the program is run at any given time but it's called about 100 times in succession. Speed is pret... the_cacc

Overloading += 14 22 (10/17/2003 12:50:09 AM) comp.lang.c++ Hi, I have the following code, which is basically overloading + and += for complex numbers. It works fine, but can someone tell me how to use the overloaded + in the definition of += rather than write the func... the_cacc

Histogram tricks in matlab? 0 162 (10/11/2003 9:56:33 PM) comp.lang.idl-pvwave I enjoy following the tricks that people do in IDL with HISTOGRAM. I was just wondering, since matlab is also an array language with the same slow loop problems, would the histogram trick translate there too? ... the_cacc

Parallel port, 12" screen & CDRW 9 11 (9/1/2003 5:21:09 PM) comp.sys.laptops Hi, I am having trouble finding a laptop that fills these 3 criteria. - parallel port - CDRW - 12" screen (or less) It needs the parallel port to attatch a dongle and a USB->parallel converter won't do. Can ... the_cacc

the_cacc's replies:

Items(18) /2 Next >> Last >|

slightly shifted plots (?) 9 37 (11/7/2003 11:25:18 AM) comp.lang.idl-pvwave hi all, I was wondering whether there would be any routine that enable to slightly shift two almost identical functions so that they do not overlap in the same plot. thanks, cheers! a. ... angaspx (1)

IDL crashes 7 42 (11/14/2003 10:28:38 AM) comp.lang.idl-pvwave Hi, I am running IDL 5.4 in Win XP and it crashes more than half of the times while running (different) programs. This only happens on my machine and not in others with the same configuration and running the ... lucianor (6)

Does IDL have function for pseudoinverse of a matrix 2 99 (12/12/2003 10:25:14 PM) comp.lang.idl-pvwave As title, since a lot of pattern recognition problems need to calcluate the pseudoinverse of a matrix. Thanks, ... julia65201 (33)

Sparse matrix + indices memory usage 4 47 (1/16/2004 1:46:59 AM) comp.soft-sys.matlab Hi, I'm making a large sparse matrix with the sparse function. To do this I first make arrays of indices corresponding to the indices of the non-zero elements in the matrix, x and y, and the non-zero values, s... spasmous287 (372)

What's Happened to IDL Newsgroup? 14 30 (1/16/2004 2:41:31 PM) comp.lang.idl-pvwave Folks, What has happened to the IDL newsgroup!? Is it relevant anymore? Has everyone moved to RSI's forum page? I wrote three (at least) inflammatory articles yesterday, trying to get a rise out of someone an... david3553 (838)

Least-Squares question. 11 34 (1/19/2004 4:44:40 PM) comp.soft-sys.matlab Assuming I want to solve: Ax = r I have the variance of each r (I assume covariance to be 0) so a weighted LS is givent by: x = inv(A' inv(V) A) A' inv(V) r If I scale the problem: Dij= Aij/sqrt(vi) ... spammezmoienmasse (9)

matlab computation precision 2 37 (1/24/2004 1:47:11 PM) comp.soft-sys.matlab i am trying to compare two decimal numbers but for some reason the number of decimals places have been altered. the numbers were both produced by the same function just that one number was used as an argument t... ziax (29)

Using CALL_EXTERNAL with C++ Code 3 77 (1/29/2004 1:49:33 PM) comp.lang.idl-pvwave Hello, I have a problem compiling and linking a DLL in C++ and integrate it into IDL via CALL External. Everything works fine with C in this way using a wrapper function: --------------------------------------... ebertf (11)

(OT) Google groups abuse 13 48 (10/3/2005 5:01:56 PM) comp.lang.c I find I am receiving lots of unwanted mail because someone called "anoopkammaran@gmail.com" has apparently arranged for me to be mailed all the messages sent to a Google Group called "Programmer's HQ" which he... richard91 (3683)

How is a compiler written 43 28 (10/31/2005 7:39:35 PM) comp.lang.c Where can I find a good resource, on the web, that will give me a good comprehensive idea of how to write a compiler in C for C or maybe another language. http://petantik.blogsome.com - A Lucid look at Rea... petantik.fool (7)