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Cluster analysis in R: determine the optimal number of clusters
...a (the data in the Q are... unclear to me):
n = 100
g = 6
set.seed(g)
d <- data.frame(x = unlist(lapply(1:g, function(i) rnorm(n/g, runif(1)*i^2))),
y = unlist(lapply(1:g, function(i) rnorm(n/g, runif(1)*i^2))))
plot(d)
One. Look for a bend or elbow in the sum of squared er...
Get name of object or class
... Also worth knowing that the name property is not supported in < IE9
– Jason
Oct 25 '13 at 15:18
10
...
How are booleans formatted in Strings in Python?
...True, False);
print "{0:e} {1:e}".format(True, False);
These are the results
True False
True False
1 0
1.000000 0.000000
1.000000e+00 0.000000e+00
Some of the %-format type specifiers (%r, %i) are not available. For details see the Format Specification Mini-Language
...
View inside ScrollView doesn't take all place
...
Just add android:fillViewport="true" in yout xml layout in Scrollview
<ScrollView android:layout_height="match_parent"
android:layout_width="match_parent"
android:background="@color/green"
xmlns:android="http://schemas.android.com/apk/res/android"
android:fitsSystemWindows="tr...
How to add a “readonly” attribute to an ?
How can I add readonly to a specific <input> ? .attr('readonly') does not work.
9 Answers
...
Truncate Two decimal places without rounding
...
Return tmp / stepper
End Function
Then use it like so:
decimal result = TruncateDecimal(0.275, 2);
or
Dim result As Decimal = TruncateDecimal(0.275, 2)
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...
Capitalize the first letter of both words in a two word string
...e for ?toupper there is this function that does what you need:
simpleCap <- function(x) {
s <- strsplit(x, " ")[[1]]
paste(toupper(substring(s, 1,1)), substring(s, 2),
sep="", collapse=" ")
}
name <- c("zip code", "state", "final count")
sapply(name, simpleCap)
zip code ...
How to modify a text file?
...aFile+"~", "r" )
for line in source:
destination.write( line )
if <some condition>:
destination.write( >some additional line> + "\n" )
source.close()
destination.close()
Instead of shutil, you can use the following.
import os
os.rename( aFile, aFile+"~" )
...
F# development and unit testing?
...guages like F#: small functions that give deterministically repeatable results lend themselves perfectly to unit tests. There are also capabilities in the F# language that facilitate writing tests. Take, for example, Object Expressions. You can very easily write fakes for functions that take as thei...
When to use window.opener / window.parent / window.top
...rom which it's called
window.parent refers to the parent of a window in a <frame> or <iframe>
window.top refers to the top-most window from a window nested in one or more layers of <iframe> sub-windows
Those will be null (or maybe undefined) when they're not relevant to the refer...