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Get list from pandas DataFrame column headers
I want to get a list of the column headers from a pandas DataFrame. The DataFrame will come from user input so I won't know how many columns there will be or what they will be called.
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For each row in an R dataframe
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Even if you pull it from a database, you can pull them all at once and then filter the result in R; that will be faster than an iterative function.
– Shane
Nov 10 '09 at 3:13
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Remove white space below image [duplicate]
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That works, but I used the other answer below from Hasan Gürsoy, since his answer doesn't cause problems with text-align:center and other issues that occur when changing the display property.
– Doug S
Nov 21 '13 at 17:03
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Eclipse hangs on loading workbench
...hat it contains a .LOCK file that if not properly closed, prevents eclipse from starting properly. On Unix based systems you can type following on command line;
rm -r workspace/.metadata
Delete your .eclipse directory in your home directory. Launch eclipse. If that doesn't work,
Open eclipse under...
How do you downgrade rubygems?
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This worked for me when downgrading from 1.5.2 to 1.4.2 because of old rails version:
sudo gem update --system 1.4.2
More information about downgrading/upgrading rubygems: https://github.com/rubygems/rubygems/blob/master/UPGRADING.md
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What is the Python 3 equivalent of “python -m SimpleHTTPServer”
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From the docs:
The SimpleHTTPServer module has been merged into http.server in Python 3.0. The 2to3 tool will automatically adapt imports when converting your sources to 3.0.
So, your command is python -m http.server, o...
String's Maximum length in Java - calling length() method
...rray; the components of
the array are referenced using integer
indices from 0 to n - 1, inclusive.
Furthermore, the indexing must be by int values, as mentioned in Section 10.4:
Arrays must be indexed by int values;
Therefore, it appears that the limit is indeed 2^31 - 1, as that is the ...
Error java.lang.OutOfMemoryError: GC overhead limit exceeded
...ning only the garbage collection at all time.
To prevent your application from soaking up CPU time without getting anything done, the JVM throws this Error so that you have a chance of diagnosing the problem.
The rare cases where I've seen this happen is where some code was creating tons of tempor...
Emulate ggplot2 default color palette
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It is just equally spaced hues around the color wheel, starting from 15:
gg_color_hue <- function(n) {
hues = seq(15, 375, length = n + 1)
hcl(h = hues, l = 65, c = 100)[1:n]
}
For example:
n = 4
cols = gg_color_hue(n)
dev.new(width = 4, height = 4)
plot(1:n, pch = 16, cex = 2...
How do I retrieve the number of columns in a Pandas data frame?
... my guess is that it does not call a function but just reads the attribute from memory?
– mkln
Nov 30 '13 at 18:59
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