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Finding quaternion representing the rotation from one vector to another
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Quaternion q;
vector a = crossproduct(v1, v2);
q.xyz = a;
q.w = sqrt((v1.Length ^ 2) * (v2.Length ^ 2)) + dotproduct(v1, v2);
Don't forget to normalize q.
Richard is right about there not being a unique rotation, but the above should give the "shortest arc," which ...
What's the right OAuth 2.0 flow for a mobile app
...implement delegated authorization in a Web API for mobile apps using OAuth 2.0. According to specification, the implicit grant flow does not support refresh tokens, which means once an access token is granted for an specific period of time, the user must grant permissions to the app again once the t...
How to compare binary files to check if they are the same?
... diff will show if the files are the same or not:
[me@host ~]$ diff 1.bin 2.bin
Binary files 1.bin and 2.bin differ
If there is no output from the command, it means that the files have no differences.
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Convert HashBytes to VarChar
I want to get the MD5 Hash of a string value in SQL Server 2005. I do this with the following command:
7 Answers
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Dynamically select data frame columns using $ and a character value
...s a reproducible example below:
# set seed for reproducibility
set.seed(123)
df <- data.frame( col1 = sample(5,10,repl=T) , col2 = sample(5,10,repl=T) , col3 = sample(5,10,repl=T) )
# We want to sort by 'col3' then by 'col1'
sort_list <- c("col3","col1")
# Use 'do.call' to call order. Se...
How can I do DNS lookups in Python, including referring to /etc/hosts?
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edited Mar 7 '19 at 22:59
Justin M. Keyes
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a...
Unix command to find lines common in two files
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220
The command you are seeking is comm. eg:-
comm -12 1.sorted.txt 2.sorted.txt
Here:
-1 : su...
no acceptable C compiler found in $PATH when installing python
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edited Jun 13 '18 at 11:52
Duncan
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answered Nov 6 '13 at 15:54
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How to put spacing between TBODY elements
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12 Answers
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How to install therubyracer gem on 10.10 Yosemite?
...xec rake clean build binary
gem install pkg/libv8-3.16.14.3-x86_64-darwin-12.gem #note that libv8 version may change, so tab through files in pkg/, also remember to use the one with version specified
then just bundle your project gems
this is the only way it worked for me on 10.10 (ruby 2.1.2)
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