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Unnamed/anonymous namespaces vs. static functions
...nonymity of unnamed namespace effectively hides its declaration making it accessible only from within a translation unit. The latter effectively works in the same manner as the static keyword.
– mloskot
Dec 23 '09 at 14:46
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Bash Templating: How to build configuration files from templates with Bash?
... RHS references some variable that references itself:
#!/bin/bash
line="$(cat; echo -n a)"
end_offset=${#line}
while [[ "${line:0:$end_offset}" =~ (.*)(\$\{([a-zA-Z_][a-zA-Z_0-9]*)\})(.*) ]] ; do
PRE="${BASH_REMATCH[1]}"
POST="${BASH_REMATCH[4]}${line:$end_offset:${#line}}"
VARNAME="${B...
Combine two columns of text in pandas dataframe
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if both columns are strings, you can concatenate them directly:
df["period"] = df["Year"] + df["quarter"]
If one (or both) of the columns are not string typed, you should convert it (them) first,
df["period"] = df["Year"].astype(str) + df["quarter"]
Beware of...
Colspan all columns
...rking-as-expected one :( I think it doesn't deserve more upvotes than the accepted answer =/
– Francisco
Dec 28 '11 at 15:07
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How can I resize an image dynamically with CSS as the browser width/height changes?
...ative units should make your life way easier, given we have the image of a cat:
Now we want this cat inside our code, while respecting aspect ratios:
img {
width: 100%;
height: auto;
}
<img src="https://www.petmd.com/sites/default/files/petmd-cat-happy-10.jpg" alt="cat">
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Flatten nested dictionaries, compressing keys
...does the key-reducer function (which I hereby refer to as 'join') require access to the entire key-path, or can it just do O(1) work at every node in the tree? If you want to be able to say joinedKey = '_'.join(*keys), that will cost you O(N^2) running time. However if you're willing to say nextKey ...
Why should text files end with a newline?
... Unix tools expect this convention and work with it. For instance, when concatenating files with cat, a file terminated by newline will have a different effect than one without:
$ more a.txt
foo
$ more b.txt
bar$ more c.txt
baz
$ cat {a,b,c}.txt
foo
barbaz
And, as the previous example also demonst...
Remove duplicate lines without sorting [duplicate]
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Surely it would be less obfuscated to name that array e.g. seen instead of x, to avoid giving newbies the impression that awk syntax is line noise
– Josip Rodin
Dec 21 '15 at 10:43
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Omit rows containing specific column of NA
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Try this:
cc=is.na(DF$y)
m=which(cc==c("TRUE"))
DF=DF[-m,]
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Using reflect, how do you set the value of a struct field?
...ch I would love to see a simple example somewhere!
– cc young
Jun 19 '11 at 10:57
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