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How to detect a Christmas Tree? [closed]
... is just a simple monochrome brightness test; any pixels with values above 220 on a 0-255 scale (where black is 0 and white is 255) are saved to a binary black-and-white image. The second threshold tries to look for red and yellow lights, which are particularly prominent in the trees in the upper l...
How to subtract 2 hours from user's local time?
...e JavaScript code block that will allow me to display the local time minus 2 hours?
2 Answers
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How to solve PHP error 'Notice: Array to string conversion in…'
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112
When you have many HTML inputs named C[] what you get in the POST array on the other end is an a...
How to store standard error in a variable
...d output.
ERROR=$( { ./useless.sh | sed s/Output/Useless/ > outfile; } 2>&1 )
Note that the semi-colon is needed (in classic shells - Bourne, Korn - for sure; probably in Bash too). The '{}' does I/O redirection over the enclosed commands. As written, it would capture errors from sed ...
How can I autoformat/indent C code in vim?
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answered Mar 1 '10 at 12:52
Amir RachumAmir Rachum
64.1k6666 gold badges154154 silver badges237237 bronze badges
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Find row where values for column is maximal in a pandas DataFrame
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252
Use the pandas idxmax function. It's straightforward:
>>> import pandas
>>>...
How can I run PowerShell with the .NET 4 runtime?
... .NET assemblies. The script was written for assemblies built against .NET 2 (the same version of the framework that PowerShell runs with), but now needs to work with .NET 4 assemblies as well as .NET 2 assemblies.
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Add new row to dataframe, at specific row-index, not appended?
...ds the (often slow) rbind call:
existingDF <- as.data.frame(matrix(seq(20),nrow=5,ncol=4))
r <- 3
newrow <- seq(4)
insertRow <- function(existingDF, newrow, r) {
existingDF[seq(r+1,nrow(existingDF)+1),] <- existingDF[seq(r,nrow(existingDF)),]
existingDF[r,] <- newrow
existin...
Unpacking, extended unpacking and nested extended unpacking
...et's see how it works for a slightly more complex example:
(a,b), c, = [1,2],'this' # a = '1', b = '2', c = 'this'
Applying the above rules, we get
((a, b), c) = ((1, 2), ('t', 'h', 'i', 's'))
But now it's clear from the structure that 'this' won't be unpacked, but assigned directl...
How do I modify fields inside the new PostgreSQL JSON datatype?
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21 Answers
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