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Finding quaternion representing the rotation from one vector to another
...
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...
API Versioning for Rails Routes
...espace :api do
namespace :v1 do
resources :users
end
namespace :v2 do
resources :users
end
match 'v:api/*path', :to => redirect("/api/v2/%{path}")
match '*path', :to => redirect("/api/v2/%{path}")
end
If your mind is still intact after this point, let me explain.
First,...
For each row return the column name of the largest value
...make examples using sample reproducible):
DF <- data.frame(V1=c(2,8,1),V2=c(7,3,5),V3=c(9,6,4))
colnames(DF)[apply(DF,1,which.max)]
[1] "V3" "V1" "V2"
A faster solution than using apply might be max.col:
colnames(DF)[max.col(DF,ties.method="first")]
#[1] "V3" "V1" "V2"
...where ties.method...
How can I list all tags in my Git repository by the date they were created?
...ioned by DarVar below)
As an example, in the git/git repo it will list the v2.10.0 tag last:
v2.9.1
v2.9.2
v2.9.3
v2.10.0-rc0
v2.10.0-rc1
v2.10.0-rc2
v2.10.0
The default order would not (git tag):
v2.1.2
v2.1.3
v2.1.4
v2.10.0
v2.10.0-rc0
v2.10.0-rc1
v2.10.0-rc2
v2.2.0
...
Understand convertRect:toView:, convertRect:FromView:, convertPoint:toView: and convertPoint:fromVie
...s wide and 100 pixels high. Now inside that, there is another view, called V2, at (10, 10, 50, 50) which means that (10, 10) is the point in V1's coordinate system where the top left corner of V2 should be located, and (50, 50) is the width and height of V2. Now, take a point INSIDE V2's coordinate ...
System.BadImageFormatException: Could not load file or assembly (from installutil.exe)
...g bitness).
In other words, running:
%windir%\Microsoft.NET\Framework\v2.0.50727\installutil.exe
or:
%windir%\Microsoft.NET\Framework64\v2.0.50727\installutil.exe
will not work (substitute in other framework versions: v1.1.4322 (32-bit only, so this issue doesn't arise) and v4.0.30319...
How to combine multiple conditions to subset a data-frame using “OR”?
...
my.data.frame <- subset(data , V1 > 2 | V2 < 4)
An alternative solution that mimics the behavior of this function and would be more appropriate for inclusion within a function body:
new.data <- data[ which( data$V1 > 2 | data$V2 < 4) , ]
Some peopl...
What does this Google Play APK publish error message mean?
... I must upload from version 1.0 to the version 2.0.
- I have uploaded the v2.0 in Beta.
- When it was uploaded, I have DEACTIVATED the v1.0 in the PROD.
- Next step was to MOVE the v2.0 to PROD from the BETA.
- Then, the PUBLISH button was activated to finish the process.
I hope it helps.!
...
How to copy commits from one branch to another?
...really have a workflow that lets you do this all by merging:
- x - x - x (v2) - x - x - x (v2.1)
\
x - x - x (wss)
So all you have to do is git checkout v2.1 and git merge wss. If for some reason you really can't do this, and you can't use git rebase to move your wss branch...
Javascript Array.sort implementation?
...iddle element.
var v0 = a[from];
var v1 = a[to - 1];
var v2 = a[third_index];
var c01 = comparefn(v0, v1);
if (c01 > 0) {
// v1 < v0, so swap them.
var tmp = v0;
v0 = v1;
v1 = tmp;
} // v0 <= v1.
var c02 = comparefn(v...