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What does “coalgebra” mean in the context of programming?
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This lets us talk about algebras as a type τ with a single function from some mess of Eithers to a single τ. For monoids, this mess is: Either (τ, τ) (); for groups (which have an extra τ → τ operation), it's: Either (Either (τ, τ) τ) (). It's a different type for every different stru...
Run R script from command line
...@Dason I am also working with R script and I am trying to execute R script from Java program and I am seeing some error. Here is my question. See if you can help out. I am using your hello function example for now to make it simple.
– user1950349
Sep 16 '15 at ...
Difference between Destroy and Delete
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Basically destroy runs any callbacks on the model while delete doesn't.
From the Rails API:
ActiveRecord::Persistence.delete
Deletes the record in the database and freezes this instance to reflect that no changes should be made (since they can't be persisted). Returns the frozen instance.
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Java Constructor Inheritance
...constructors were inherited... then because every class eventually derives from Object, every class would end up with a parameterless constructor. That's a bad idea. What exactly would you expect:
FileInputStream stream = new FileInputStream();
to do?
Now potentially there should be a way of eas...
Remove leading zeros from a number in Javascript [duplicate]
...t is the simplest and cross-browser compatible way to remove leading zeros from a number in Javascript ?
3 Answers
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Delete specified file from document directory
I want to delete an image from my app document directory. Code I have written to delete image is:
10 Answers
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Docker: adding a file from a parent directory
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You can build the Dockerfile from the parent directory:
docker build -t <some tag> -f <dir/dir/Dockerfile> .
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How do you split a list into evenly sized chunks?
...unks you want:
def chunks(lst, n):
"""Yield successive n-sized chunks from lst."""
for i in range(0, len(lst), n):
yield lst[i:i + n]
import pprint
pprint.pprint(list(chunks(range(10, 75), 10)))
[[10, 11, 12, 13, 14, 15, 16, 17, 18, 19],
[20, 21, 22, 23, 24, 25, 26, 27, 28, 29]...
What does Python's eval() do?
...oot jail with ptrace checks in a virtual machine to prevent malicious code from doing anything bad. Far more complicated than a simple eval. Also, eval is Python-specific. codepad supports a bunch of languages.
– FogleBird
Feb 21 '12 at 20:16
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How do I obtain crash-data from my Android application?
How can I get crash data (stack traces at least) from my Android application? At least when working on my own device being retrieved by cable, but ideally from any instance of my application running on the wild so that I can improve it and make it more solid.
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