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Gitignore not working
...s command:
git rm -r --cached .
This removes any changed files from the index(staging area), then just run:
git add .
Commit it:
git commit -m ".gitignore is now working"
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Vim and Ctags tips and tricks [closed]
...that extracts the list of C and header files from the Makefile. This way I index only the files actually used by the project.
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answered Feb 19 '09 at ...
Postgres: INSERT if does not exist already
...
One approach would be to create a non-constrained (no unique indexes) table to insert all your data into and do a select distinct from that to do your insert into your hundred table.
So high level would be. I assume all three columns are distinct in my example so for step3 change the...
Add timestamps to an existing table
...
Available transformations are
change_table :table do |t|
t.column
t.index
t.timestamps
t.change
t.change_default
t.rename
t.references
t.belongs_to
t.string
t.text
t.integer
t.float
t.decimal
t.datetime
t.timestamp
t.time
t.date
t.binary
t.boolean
t.remove
...
Rank items in an array using Python/NumPy, without sorting array twice
...st as well. This can be obtained even more easily as >>> unique, index, inverse = np.unique(a, True, True) >>> rank_min = rank[index][inverse]
– Eelco Hoogendoorn
Jan 6 '14 at 20:47
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How do cache lines work?
...y often. There was a high probability that if a program reads
the value at index i, that the program will also read the value i+1. This probability is slightly higher than the probability that the same program will also read the value i+2 and so on.
So given a memory address it was (and still is) ...
Tricky Google interview question
...std::vector<int> v(n);
v[0] = 1;
int i2 = 0; // Index for 2
int i5 = 0; // Index for 5
int x2 = 2 * v[i2]; // Next two candidates
int x5 = 5 * v[i5];
for (int i = 1; i != n; ++i)
{
int m = std::min(x2, x5);
std::cout &l...
What is the “FS”/“GS” register intended for?
...nd GS for efficient access of thread_local data is a happy unintended consequence of an historical error.
– Richard Hodges
Jan 4 '18 at 12:41
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Converting a list to a set changes element order
... 3:
>>> x = [1, 2, 20, 6, 210]
>>> sorted(set(x), key=x.index)
[1, 2, 20, 6, 210]
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...
Migration: Cannot add foreign key constraint
...constraint..."
// $table->integer('user_id')->unsigned()->index();
$table->bigInteger('user_id')->unsigned()->index(); // this is working
$table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
});
}
As you can see,...