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Automatically expanding an R factor into a collection of 1/0 indicator variables for every factor le
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@colin, Not fully automatic, but you can use naresid to put the missing values back in after using na.exclude. A quick example: tmp <- data.frame(x=factor(c('a','b','c',NA,'a'))); tmp2 <- na.exclude(tmp); tmp3 <- model.matrix( ~x-1, tmp2); tmp4 <- naresid(attr(t...
Remove rows with all or some NAs (missing values) in data.frame
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tidyr has a new function drop_na:
library(tidyr)
df %>% drop_na()
# gene hsap mmul mmus rnor cfam
# 2 ENSG00000199674 0 2 2 2 2
# 6 ENSG00000221312 0 1 2 3 2
df %>% drop_na(rn...
Remove last item from array
...n.js"></script>
<b>Original Array : </b>
<div id="div1"></div>
<br/>
<b>After slice(0, -1): </b>
<div id="div2"></div>
instead of doing :
arr.slice(-1); // returns [2]
Here is a demo:
var arr = [1, 0, 2];
var ne...
How can I put a database under git (version control)?
...ou make the new schema changes to and not touch the old one since as you said you are making a branch.
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Elegant setup of Python logging in Django
... - the corresponding value will be a dict in which each key is a formatter id and each value is a dict describing how to configure the corresponding Formatter instance.
filters - the corresponding value will be a dict in which each key is a filter id and each value is a dict describing how to config...
How to show full object in Chrome console?
...r() to output a browse-able object you can click through instead of the .toString() version, like this:
console.dir(functor);
Prints a JavaScript representation of the specified object. If the object being logged is an HTML element, then the properties of its DOM representation are printed [1]...
Regular expression for a hexadecimal number?
...an also recognize hex patterns like: '535GH0G73' For Java, we can use e.g String.matches() for checking this.. Thank you guys for the response :)
– saurcery
Feb 10 '12 at 2:23
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Examples of GoF Design Patterns in Java's core libraries
...ognizeable by creational methods returning the instance itself)
java.lang.StringBuilder#append() (unsynchronized)
java.lang.StringBuffer#append() (synchronized)
java.nio.ByteBuffer#put() (also on CharBuffer, ShortBuffer, IntBuffer, LongBuffer, FloatBuffer and DoubleBuffer)
javax.swing.GroupLayout.G...
How can i tell if an object has a key value observer attached
...{
[someObject removeObserver:someObserver forKeyPath:somePath];
}@catch(id anException){
//do nothing, obviously it wasn't attached because an exception was thrown
}
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Doctrine 2 can't use nullable=false in manyToOne relation?
... without a Package defined. User should own the relation. Relation is bidirectional, so a Package has zero or more users in it.
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