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Find indices of elements equal to zero in a NumPy array
NumPy has the efficient function/method nonzero() to identify the indices of non-zero elements in an ndarray object. What is the most efficient way to obtain the indices of the elements that do have a value of zero?
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Get Slightly Lighter and Darker Color from UIColor
I was looking to be able to turn any UIColor into a gradient. The way I am intending to do this is by using Core Graphics to draw a gradient. What I am trying to do is to get a color, lets say:
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Find MongoDB records where array field is not empty
All of my records have a field called "pictures". This field is an array of strings.
11 Answers
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Reduce, fold or scan (Left/Right)?
When should I use reduceLeft , reduceRight , foldLeft , foldRight , scanLeft or scanRight ?
3 Answers
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Regular expression to match numbers with or without commas and decimals in text
I'm trying to locate and replace all numbers in a body of text. I've found a few example regex's, which almost solve the problem, but none are perfect yet. The problem I have is that the numbers in my text may or may not have decimals and commas. For example:
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How to test which port MySQL is running on and whether it can be connected to?
I have installed MySQL and even logged in there as a user.
13 Answers
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How do you make an array of structs in C?
I'm trying to make an array of structs where each struct represents a celestial body.
7 Answers
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What is the best way to initialize a JavaScript Date to midnight?
What is the simplest way to obtain an instance of new Date() but set the time at midnight?
9 Answers
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How to validate IP address in Python? [duplicate]
What's the best way to validate that an IP entered by the user is valid? It comes in as a string.
11 Answers
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