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[mathcad] Re: Files Saved in MathCAD 2001i Pro Can't Be Compressed

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[mathcad] Re: Files Saved in MathCAD 2001i Pro Can't Be Compressed
Author: Krzysztof Sadowski    Posted: Wed, 22 May 2002 20:59:02 +0200
Witaj Guang, W Twoim liœcie datowanym 22 maja 2002 (20:49:17) mo¿na przeczytaæ: TG> Hello, TG> I try to zip files saved in MathCAD 2001i pro by WinZip (v 8.0) and PKware TG> (v 2.70). The files can not be compressed at all. TG> Anyone knows why? TG> Thanks TG> G. S. Tong TG> /> TG> --- TG> The Mathcad List - Discussion, Support & News TG> Contributions: /> TG> Hosted by: Adept Scientific http://www.adeptscience.com TG> List Archive: http://lists.adeptscience.co.uk/ TG> --- TG> Would you like this to come to a different email address? TG> --- TG> Simply leave the mailing list (see below) and re-join by TG> sending a blank email from the new address to: TG> or TG> --- TG> If you do not want to be on the Mathcad list, simply send a TG> blank email (no subject or message needed) to: TG> /> because MathCad2001 use internal compression of *.mcd files (for example cdr files from Corel 9 are compress from corel program) -- Pozdrowienia, Krzysztof /> --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: />

[mathcad] Re: Files Saved in MathCAD 2001i Pro Can't Be Compr essed
Author: Pergande, Albert N    Posted: Wed, 22 May 2002 16:01:34 -0400
Perhaps they have a very high entropy. Typically, Power point files and executables don't compress much at all. Albert Pergande, Senior RF Engineer Lockheed Martin Missiles and Fire Control Radar MP 200 5600 Sand Lake Road Orlando Fla 32819 Voice 407-356-5169 Fax 407-356-0933 Work Related E-mail - /> Personal E-mail - /> -----Original Message----- From: Krzysztof Sadowski /> Sent: Wednesday, May 22, 2002 2:59 PM To: Mathcad Discussion List Subject: [mathcad] Re: Files Saved in MathCAD 2001i Pro Can't Be Compressed Witaj Guang, W Twoim lioecie datowanym 22 maja 2002 (20:49:17) mo¿na przeczytaæ: TG> Hello, TG> I try to zip files saved in MathCAD 2001i pro by WinZip (v 8.0) and PKware TG> (v 2.70). The files can not be compressed at all. TG> Anyone knows why? TG> Thanks TG> G. S. Tong TG> /> TG> --- TG> The Mathcad List - Discussion, Support & News TG> Contributions: /> TG> Hosted by: Adept Scientific http://www.adeptscience.com TG> List Archive: http://lists.adeptscience.co.uk/ TG> --- TG> Would you like this to come to a different email address? TG> --- TG> Simply leave the mailing list (see below) and re-join by TG> sending a blank email from the new address to: TG> or TG> --- TG> If you do not want to be on the Mathcad list, simply send a TG> blank email (no subject or message needed) to: TG> /> because MathCad2001 use internal compression of *.mcd files (for example cdr files from Corel 9 are compress from corel program) -- Pozdrowienia, Krzysztof /> --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: /> --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: />

[mathcad] RE: [MathCAD] Re: Files Saved in MathCAD 2001i Pro Can't Be Compr essed
Author: Tong, Guang    Posted: Wed, 22 May 2002 15:12:38 -0500
But, the same files previously saved on v. 2000 pro could be compressed in a very good ratio. -----Original Message----- From: Pergande, Albert N /> Sent: Wednesday, May 22, 2002 3:02 PM To: Mathcad Discussion List Subject: [mathcad] Re: Files Saved in MathCAD 2001i Pro Can't Be Compr essed Perhaps they have a very high entropy. Typically, Power point files and executables don't compress much at all. Albert Pergande, Senior RF Engineer Lockheed Martin Missiles and Fire Control Radar MP 200 5600 Sand Lake Road Orlando Fla 32819 Voice 407-356-5169 Fax 407-356-0933 Work Related E-mail - /> Personal E-mail - /> -----Original Message----- From: Krzysztof Sadowski /> Sent: Wednesday, May 22, 2002 2:59 PM To: Mathcad Discussion List Subject: [mathcad] Re: Files Saved in MathCAD 2001i Pro Can't Be Compressed Witaj Guang, W Twoim lioecie datowanym 22 maja 2002 (20:49:17) mo¿na przeczytaæ: TG> Hello, TG> I try to zip files saved in MathCAD 2001i pro by WinZip (v 8.0) and PKware TG> (v 2.70). The files can not be compressed at all. TG> Anyone knows why? TG> Thanks TG> G. S. Tong TG> /> TG> --- TG> The Mathcad List - Discussion, Support & News TG> Contributions: /> TG> Hosted by: Adept Scientific http://www.adeptscience.com TG> List Archive: http://lists.adeptscience.co.uk/ TG> --- TG> Would you like this to come to a different email address? TG> --- TG> Simply leave the mailing list (see below) and re-join by TG> sending a blank email from the new address to: TG> or TG> --- TG> If you do not want to be on the Mathcad list, simply send a TG> blank email (no subject or message needed) to: TG> /> because MathCad2001 use internal compression of *.mcd files (for example cdr files from Corel 9 are compress from corel program) -- Pozdrowienia, Krzysztof /> --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: /> --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: /> --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: />

[mathcad] RE: [MathCAD] Re: Files Saved in MathCAD 2001i Pro Can't Be Compr essed
Author: Pergande, Albert N    Posted: Wed, 22 May 2002 16:23:10 -0400
Well, perhaps they changed the way they store the files substantially. Is there a difference in file size that depends on whether you store in 2000,2001, or 2001i? The compression routines don't really care what sort of data they compress, but the amount of disorder in the file has a lot to do with the compression ratio. In fact, compression ratio from th eLZ compression algorithm is a good measure of entropy, and it's one of the metrics returned by the code I have to measure disorder. Have you looked at files in both formats with a hex editor? Albert Pergande, Senior RF Engineer Lockheed Martin Missiles and Fire Control Radar MP 200 5600 Sand Lake Road Orlando Fla 32819 Voice 407-356-5169 Fax 407-356-0933 Work Related E-mail - /> Personal E-mail - /> -----Original Message----- From: Tong, Guang /> Sent: Wednesday, May 22, 2002 4:13 PM To: Mathcad Discussion List Subject: [mathcad] RE: [MathCAD] Re: Files Saved in MathCAD 2001i Pro Can't Be Compr essed But, the same files previously saved on v. 2000 pro could be compressed in a very good ratio. -----Original Message----- From: Pergande, Albert N /> Sent: Wednesday, May 22, 2002 3:02 PM To: Mathcad Discussion List Subject: [mathcad] Re: Files Saved in MathCAD 2001i Pro Can't Be Compr essed Perhaps they have a very high entropy. Typically, Power point files and executables don't compress much at all. Albert Pergande, Senior RF Engineer Lockheed Martin Missiles and Fire Control Radar MP 200 5600 Sand Lake Road Orlando Fla 32819 Voice 407-356-5169 Fax 407-356-0933 Work Related E-mail - /> Personal E-mail - /> -----Original Message----- From: Krzysztof Sadowski /> Sent: Wednesday, May 22, 2002 2:59 PM To: Mathcad Discussion List Subject: [mathcad] Re: Files Saved in MathCAD 2001i Pro Can't Be Compressed Witaj Guang, W Twoim lioecie datowanym 22 maja 2002 (20:49:17) mo¿na przeczytaæ: TG> Hello, TG> I try to zip files saved in MathCAD 2001i pro by WinZip (v 8.0) and PKware TG> (v 2.70). The files can not be compressed at all. TG> Anyone knows why? TG> Thanks TG> G. S. Tong TG> /> TG> --- TG> The Mathcad List - Discussion, Support & News TG> Contributions: /> TG> Hosted by: Adept Scientific http://www.adeptscience.com TG> List Archive: http://lists.adeptscience.co.uk/ TG> --- TG> Would you like this to come to a different email address? TG> --- TG> Simply leave the mailing list (see below) and re-join by TG> sending a blank email from the new address to: TG> or TG> --- TG> If you do not want to be on the Mathcad list, simply send a TG> blank email (no subject or message needed) to: TG> /> because MathCad2001 use internal compression of *.mcd files (for example cdr files from Corel 9 are compress from corel program) -- Pozdrowienia, Krzysztof /> --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: /> --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: /> --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: /> --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: />

[mathcad] RE: [MathCAD] Re: Files Saved in MathCAD 2001i Pro Can't Be Compr essed
Author: Tong, Guang    Posted: Thu, 23 May 2002 08:16:22 -0500
Thanks, Albert. I saved a file, which is in v2000, to v2001i and then zipped both files. 1) There is no difference in the sizes of both files. 2) The file stored in 2000 is compressed at a ratio of 93% while the file stored in 2001i compressed at a ratio of zero. I don't have a hex editor. -----Original Message----- From: Pergande, Albert N /> Sent: Wednesday, May 22, 2002 3:23 PM To: Mathcad Discussion List Subject: [mathcad] RE: [MathCAD] Re: Files Saved in MathCAD 2001i Pro Can't Be Compr essed Well, perhaps they changed the way they store the files substantially. Is there a difference in file size that depends on whether you store in 2000,2001, or 2001i? The compression routines don't really care what sort of data they compress, but the amount of disorder in the file has a lot to do with the compression ratio. In fact, compression ratio from th eLZ compression algorithm is a good measure of entropy, and it's one of the metrics returned by the code I have to measure disorder. Have you looked at files in both formats with a hex editor? Albert Pergande, Senior RF Engineer Lockheed Martin Missiles and Fire Control Radar MP 200 5600 Sand Lake Road Orlando Fla 32819 Voice 407-356-5169 Fax 407-356-0933 Work Related E-mail - /> Personal E-mail - /> -----Original Message----- From: Tong, Guang /> Sent: Wednesday, May 22, 2002 4:13 PM To: Mathcad Discussion List Subject: [mathcad] RE: [MathCAD] Re: Files Saved in MathCAD 2001i Pro Can't Be Compr essed But, the same files previously saved on v. 2000 pro could be compressed in a very good ratio. -----Original Message----- From: Pergande, Albert N /> Sent: Wednesday, May 22, 2002 3:02 PM To: Mathcad Discussion List Subject: [mathcad] Re: Files Saved in MathCAD 2001i Pro Can't Be Compr essed Perhaps they have a very high entropy. Typically, Power point files and executables don't compress much at all. Albert Pergande, Senior RF Engineer Lockheed Martin Missiles and Fire Control Radar MP 200 5600 Sand Lake Road Orlando Fla 32819 Voice 407-356-5169 Fax 407-356-0933 Work Related E-mail - /> Personal E-mail - /> -----Original Message----- From: Krzysztof Sadowski /> Sent: Wednesday, May 22, 2002 2:59 PM To: Mathcad Discussion List Subject: [mathcad] Re: Files Saved in MathCAD 2001i Pro Can't Be Compressed Witaj Guang, W Twoim lioecie datowanym 22 maja 2002 (20:49:17) mo¿na przeczytaæ: TG> Hello, TG> I try to zip files saved in MathCAD 2001i pro by WinZip (v 8.0) and PKware TG> (v 2.70). The files can not be compressed at all. TG> Anyone knows why? TG> Thanks TG> G. S. Tong TG> /> TG> --- TG> The Mathcad List - Discussion, Support & News TG> Contributions: /> TG> Hosted by: Adept Scientific http://www.adeptscience.com TG> List Archive: http://lists.adeptscience.co.uk/ TG> --- TG> Would you like this to come to a different email address? TG> --- TG> Simply leave the mailing list (see below) and re-join by TG> sending a blank email from the new address to: TG> or TG> --- TG> If you do not want to be on the Mathcad list, simply send a TG> blank email (no subject or message needed) to: TG> /> because MathCad2001 use internal compression of *.mcd files (for example cdr files from Corel 9 are compress from corel program) -- Pozdrowienia, Krzysztof /> --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: /> --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: /> --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: /> --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: /> --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: />

[mathcad] Re: Files Saved in Mathcad 2001i Pro Can't Be Compressed
Author: Bryce Hesterman    Posted: Fri, 24 May 2002 21:34:58 -0600
I think that I know why Mathcad 2001i files cannot be compressed. In the older formats, I could open Mathcad files with a text editor and be able to recognize some of what I saw. I learned how I could manually adjust a code at the beginning of the file to recognize or even change what version it was. There have been postings to this forum that it was not hard to break into a password protected file. There are authors who would like to be able to securely lock Mathcad files so that locked collapsed areas cannot be opened, and I read somewhere that 2001i provides this security. If you open a 2001i file with a text editor, you can see that the contents are quite scrambled. This makes it more difficult to decipher locked files, but it also makes the files uncompressible since there is so much disorder in an encrypted file. If you need compression, save your files in an older format. Bryce Hesterman. --- The Mathcad List - Discussion, Support & News Contributions: /> Hosted by: Adept Scientific http://www.adeptscience.com List Archive: http://lists.adeptscience.co.uk/ --- Would you like this to come to a different email address? --- Simply leave the mailing list (see below) and re-join by sending a blank email from the new address to: or --- If you do not want to be on the Mathcad list, simply send a blank email (no subject or message needed) to: />

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