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 Showing results 1 to 25 of 132 Search took 0.03 seconds. Search: Posts Made By: Chris Card
 2022-07-25, 12:20 Replies: 5 Views: 782 Posted By Chris Card The matrix I gave has determinant 1, but is it a... The matrix I gave has determinant 1, but is it a rotation matrix? Not as a matrix over the integers certainly. A square matrix R is a rotation matrix if and only if transpose(R) = inverse(R) and...
 2022-07-21, 14:24 Replies: 5 Views: 782 Posted By Chris Card What about 23 -12 25 -13 ? What about 23 -12 25 -13 ?
 Forum: Math 2020-10-06, 08:12 Replies: 8 Views: 2,393 Posted By Chris Card For what it's worth, here's my C++ implementation... For what it's worth, here's my C++ implementation of block lanczos that I wrote a few years ago, based on Montgomery's paper:...
 Forum: Homework Help 2020-03-17, 13:19 Replies: 3 Views: 9,591 Posted By Chris Card Do you know how to do integration by... Do you know how to do integration by substitution? If so, try setting x = Ny and rewrite the integral in terms of y instead of x. Chris
 Forum: Homework Help 2019-09-30, 15:06 Replies: 10 Views: 7,197 Posted By Chris Card I asked a similar question on math.stackexchange... I asked a similar question on math.stackexchange a while ago: https://math.stackexchange.com/questions/4680/simplification-of-expressions-containing-radicals Some of the replies there might help ...
 Forum: Programming 2019-06-27, 12:18 Replies: 20 Views: 10,218 Posted By Chris Card This works fine for me using gcc 8.3.1 ... This works fine for me using gcc 8.3.1 #include int main(int argc, char* argv[]) { const char* str_arr[] = { "blah", "blah blah", "a b c d e" }; for (const char* s :...
 2016-12-06, 10:55 Replies: 8 Views: 3,722 Posted By Chris Card I don't get 1/sqrt(2) * (-1-i), I get -1 ... I don't get 1/sqrt(2) * (-1-i), I get -1 Chris
 2016-12-06, 10:45 Replies: 8 Views: 3,722 Posted By Chris Card Really? (i+1)^2 = 2i and go from there ... ... Really? (i+1)^2 = 2i and go from there ... Chris
 Forum: Lounge 2016-01-26, 12:29 Replies: 1,973 Views: 237,085 Posted By Chris Card Marvin Minsky ... Marvin Minsky http://www.bbc.co.uk/news/technology-35409119
 Forum: Lounge 2011-10-14, 16:22 Replies: 7 Views: 702 Posted By Chris Card Sad loss indeed, a great pioneer. Though am... Sad loss indeed, a great pioneer. Though am I allowed to say that I hate code that doesn't line up curly braces ... :-( Chris
 Forum: Programming 2011-08-04, 15:21 Replies: 30 Views: 4,724 Posted By Chris Card The libiodbc package has some sample config files... The libiodbc package has some sample config files in it, on my system it puts them here: /usr/share/doc/libiodbc-3.52.7/odbc.ini.sample /usr/share/doc/libiodbc-3.52.7/odbcinst.ini.sample Chris
 Forum: Programming 2011-08-04, 13:52 Replies: 30 Views: 4,724 Posted By Chris Card Is unixODBC package installed too? That's... Is unixODBC package installed too? That's where /usr/bin/isql comes from according to yum provides "*/isql" unixODBC-2.2.14-12.fc14.x86_64 : A complete ODBC driver manager for Linux...
 Forum: Programming 2011-08-04, 10:55 Replies: 30 Views: 4,724 Posted By Chris Card On Fedora isql comes from the unixODBC package,... On Fedora isql comes from the unixODBC package, whereas iodbctest and iodbctestw come from a different package, libiodbc, so it's not too surprising that isql works and iodbtest doesn't; the config...
 Forum: Programming 2011-08-03, 16:34 Replies: 30 Views: 4,724 Posted By Chris Card I've had ODBC working to mysql on Centos 5.4,... I've had ODBC working to mysql on Centos 5.4, which should be similar. I second the suggestion of using tcpdump or wireshark to see what's going over the wire. Also you could try running the...
 Forum: Factoring 2011-07-21, 11:51 Replies: 23 Views: 2,541 Posted By Chris Card One factor is that polynomials with smaller... One factor is that polynomials with smaller coefficients can be found if the degree is higher. Then the relation norms are smaller (on average), and so they are more likely to be smooth. Chris
 Forum: Factoring 2011-01-31, 23:22 Replies: 18 Views: 2,907 Posted By Chris Card I'd put in a vote for Cohen's "A Course in... I'd put in a vote for Cohen's "A Course in Computational Algebraic Number Theory" too. Chris
 2011-01-25, 18:16 Replies: 410 Views: 27,445 Posted By Chris Card Something like "a relation between two sets A and... Something like "a relation between two sets A and B is a subset of the Cartesian product A x B"? Chris
 2011-01-19, 15:20 Replies: 410 Views: 27,445 Posted By Chris Card CRG's example gives a definition for a relation ~... CRG's example gives a definition for a relation ~ on the set of real numbers. Since the the relation is binary, you only need two symbols to define it. CRG used x and y but that was just arbitrary. ...
 2011-01-19, 14:28 Replies: 410 Views: 27,445 Posted By Chris Card Suppose x ~ y and y ~ z. Then by definition, x -... Suppose x ~ y and y ~ z. Then by definition, x - y is an integer and y - z is an integer. If we can prove that x - z is an integer then x ~ z which is the third property of an equivalence relation....
 Forum: Science & Technology 2010-11-08, 17:19 Replies: 172 Views: 17,007 Posted By Chris Card You could always try your local library. ... You could always try your local library. Chris
 Forum: Science & Technology 2010-11-08, 16:38 Replies: 172 Views: 17,007 Posted By Chris Card This book:... This book: http://www.amazon.com/Einstein-Beginners-Michael-McGuinness/dp/0679725105 is a good place to start, but Bob S. is correct that you need a lot of mathematical background to really...
 Forum: Puzzles 2010-11-06, 07:58 Replies: 22 Views: 2,185 Posted By Chris Card I see what you mean. Sometimes yeah has a bit of... I see what you mean. Sometimes yeah has a bit of the 'a' at the end (e.g. the Beatles song "She loves me, yeah, yeah, yeah") and sometimes it's shorter and the 'a' sound disappears. But the 'e'...
 Forum: Puzzles 2010-11-06, 00:59 Replies: 22 Views: 2,185 Posted By Chris Card The "ea" sound in yeah rhymes with things like... The "ea" sound in yeah rhymes with things like bet. Hat rhymes with cat. Chris
 Forum: Puzzles 2010-11-05, 10:06 Replies: 22 Views: 2,185 Posted By Chris Card yeah ---- hat ?? The English used to speak... yeah ---- hat ?? The English used to speak like that, but not for a long time - the 1950s maybe? Chris
 2010-11-03, 15:19 Replies: 34 Views: 6,331 Posted By Chris Card I thought it might give a speed up, because for... I thought it might give a speed up, because for each row you only need to generate the masks for the combinations of columns with 1 set, not the combinations of all the columns. Plus, if you store...
 Showing results 1 to 25 of 132

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