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How to iterate for loop in reverse order in swift?
When I use the for loop in Playground, everything worked fine, until I changed the first parameter of for loop to be the highest value. (iterated in descending order)
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How do I create an empty array/matrix in NumPy?
I can't figure out how to use an array or matrix in the way that I would normally use a list. I want to create an empty array (or matrix) and then add one column (or row) to it at a time.
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What's the fastest way to merge/join data.frames in R?
For example (not sure if most representative example though):
5 Answers
5
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Tricky Google interview question
A friend of mine is interviewing for a job. One of the interview questions got me thinking, just wanted some feedback.
21 A...
How to form tuple column from two columns in Pandas
I've got a Pandas DataFrame and I want to combine the 'lat' and 'long' columns to form a tuple.
4 Answers
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Remove insignificant trailing zeros from a number?
Have I missed a standard API call that removes trailing insignificant zeros from a number?
15 Answers
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Obfuscated C Code Contest 2006. Please explain sykes2.c
How does this C program work?
4 Answers
4
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Fast Bitmap Blur For Android SDK
Currently in an Android application that I'm developing I'm looping through the pixels of an image to blur it. This takes about 30 seconds on a 640x480 image.
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Truncate number to two decimal places without rounding
Suppose I have a value of 15.7784514, I want to display it 15.77 with no rounding.
36 Answers
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How to plot two histograms together in R?
I am using R and I have two data frames: carrots and cucumbers. Each data frame has a single numeric column which lists the length of all measured carrots (total: 100k carrots) and cucumbers (total: 50k cucumbers).
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