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How do I create a URL shortener?
...ou just do a reverse lookup in your alphabet.
e9a62 will be resolved to "4th, 61st, and 0th letter in the alphabet".
e9a62 = [4,61,0] = 4×622 + 61×621 + 0×620 = 1915810
Now find your database-record with WHERE id = 19158 and do the redirect.
Example implementations (provided by commenters)
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Creating an R dataframe row-by-row
...de in R.
If you can, allocate your entire data.frame up front:
N <- 1e4 # total number of rows to preallocate--possibly an overestimate
DF <- data.frame(num=rep(NA, N), txt=rep("", N), # as many cols as you need
stringsAsFactors=FALSE) # you don't know levels yet...
if A vs if A is not None:
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answered Oct 19 '11 at 4:09
Greg HewgillGreg Hewgill
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What is the difference between \r and \n?
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edited Mar 3 '12 at 21:46
answered Aug 14 '09 at 19:40
J...
Add directives from directive in AngularJS
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Khanh TOKhanh TO
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How do I specify different layouts for portrait and landscape orientations?
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Create a layout-land directory and put the landscape version of your layout XML file in that dir...
Processing Symbol Files in Xcode
...a specific CPU type. The currently CPU types needed are armv7 (e.g. iPhone 4, iPhone 4s), armv7s (e.g. iPhone 5) and arm64 (e.g. iPhone 5s).
So if you want to symbolicate a crash report that happened on an iPhone 5 with armv7s and only have the symbols for armv7 for that specific iOS version, Xcode...
How do I find numeric columns in Pandas?
...exclude. So isNumeric would look like:
numerics = ['int16', 'int32', 'int64', 'float16', 'float32', 'float64']
newdf = df.select_dtypes(include=numerics)
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Importing a Maven project into Eclipse from Git
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Maarten Bodewes
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answered Sep 1 '11 at 11:56
Sri SankaranSr...
Python Image Library fails with message “decoder JPEG not available” - PIL
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libjpeg-dev is required to be able to process jpegs with pillow (or PIL), so you need to insta...