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Good Linux (Ubuntu) SVN client [closed]
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How unique is UUID?
... on Universally unique identifiers (link leads to a revision from December 2016 before editing reworked the section).
Also see the current section on the same subject on the same Universally unique identifier article, Collisions.
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Java Reflection: How to get the name of a variable?
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edited Mar 20 '14 at 19:30
answered Apr 13 '09 at 15:55
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jQuery Event Keypress: Which key was pressed?
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Wolph
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answered Nov 19 '08 at 15:07
Eran GalperinEran Galperin
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How to deploy correctly when using Composer's develop / production switch?
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answered Feb 20 '14 at 22:42
Jasper N. BrouwerJasper N. Brouwer
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How can I create a correlation matrix in R?
... between your matrix x and matrix y. Ex.:
set.seed(1)
x <- matrix(rnorm(20), nrow=5, ncol=4)
y <- matrix(rnorm(15), nrow=5, ncol=3)
COR <- cor(x,y)
COR
image(x=seq(dim(x)[2]), y=seq(dim(y)[2]), z=COR, xlab="x column", ylab="y column")
text(expand.grid(x=seq(dim(x)[2]), y=seq(dim(y)[2])), la...
Ruby on Rails: how do I sort with two columns using ActiveRecord?
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edited Aug 27 '10 at 20:28
answered Aug 27 '10 at 20:22
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Google Map API V3: How to add Custom data to markers
...w google.maps.Marker({
map: map,
position: new google.maps.LatLng(-20, 0)
});
markerC['customInfo'] = "Marker C";
Then to retrieve it in a similar manner:
google.maps.event.addListener(markerA, 'click', function() {
alert(this.customInfo);
});
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Selecting with complex criteria from pandas.DataFrame
... B C
0 9 40 300
1 9 70 700
2 5 70 900
3 8 80 900
4 7 50 200
5 9 30 900
6 2 80 700
7 2 80 400
8 5 80 300
9 7 70 800
We can apply column operations and get boolean Series objects:
>>> df["B"] > 50
0 False
1 True
2 True
3 True
4 False
5...
Calculate difference between two datetimes in MySQL
...F MySQL function. For example, you can use:
SELECT TIMESTAMPDIFF(SECOND, '2012-06-06 13:13:55', '2012-06-06 15:20:18')
In your case, the third parameter of TIMSTAMPDIFF function would be the current login time (NOW()). Second parameter would be the last login time, which is already in the databas...