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Search: Posts Made By: Chris Card
Forum: Homework Help 2020-03-17, 13:19
Replies: 3
Views: 2,936
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: 1,504
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: 2,573
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 <iostream>

int main(int argc, char* argv[])
{
const char* str_arr[] = { "blah", "blah blah", "a b c d e" };
for (const char* s :...
Forum: Number Theory Discussion Group 2016-12-06, 10:55
Replies: 8
Views: 1,798
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
Forum: Number Theory Discussion Group 2016-12-06, 10:45
Replies: 8
Views: 1,798
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: 1,494
RIP
Views: 97,885
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: 468
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: 2,120
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: 2,120
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: 2,120
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: 2,120
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: 1,330
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: 1,730
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
Forum: Computer Science & Computational Number Theory 2011-01-25, 18:16
Replies: 410
Views: 13,542
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
Forum: Computer Science & Computational Number Theory 2011-01-19, 15:20
Replies: 410
Views: 13,542
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.
...
Forum: Computer Science & Computational Number Theory 2011-01-19, 14:28
Replies: 410
Views: 13,542
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: 6,127
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: 6,127
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: 937
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: 937
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: 937
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
Forum: Other Mathematical Topics 2010-11-03, 15:19
Replies: 34
Views: 3,091
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...
Forum: Other Mathematical Topics 2010-11-03, 13:14
Replies: 34
Views: 3,091
Posted By Chris Card
I'm not sure what your brute-force algorithm is,...

I'm not sure what your brute-force algorithm is, but one approach would be this (not tested!):


for each row
for each mask size you are interested in
find each combination of columns...
Forum: Linux 2010-09-22, 14:45
Replies: 12
Views: 3,227
Posted By Chris Card
On the other hand, I've found it much easier to...

On the other hand, I've found it much easier to set up a development environment with Cygwin (though to be honest I now tend to run Fedora as a VirtualBox guest). I don't remember having to reinstall...
Forum: Linux 2010-09-22, 10:34
Replies: 12
Views: 3,227
Posted By Chris Card
I understand, but the original question was about...

I understand, but the original question was about grep.

Chris
Showing results 1 to 25 of 129

 
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