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Select rows of a matrix that meet a condition
...swers (using subset or m$three) will work, otherwise they will not.
To perform the operation on a matrix, you can define a column by name:
m[m[, "three"] == 11,]
Or by number:
m[m[,3] == 11,]
Note that if only one row matches, the result is an integer vector, not a matrix.
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How do I mock the HttpContext in ASP.NET MVC using Moq?
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This one worked for me by allowing me to set a mock HttpContext on the controller.
– Joel Malone
May 14 '12 at 12:22
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How can I see the entire HTTP request that's being sent by my Python application?
... case, I'm using the requests library to call PayPal's API over HTTPS. Unfortunately, I'm getting an error from PayPal, and PayPal support cannot figure out what the error is or what's causing it. They want me to "Please provide the entire request, headers included".
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Declare slice or make slice?
...you can see more examples at "Go Slices: usage and internals", where a use for []int is mentioned:
Since the zero value of a slice (nil) acts like a zero-length slice, you can declare a slice variable and then append to it in a loop:
// Filter returns a new slice holding only
// the elements o...
Determine direct shared object dependencies of a Linux binary?
...ly find out the direct shared object dependencies of a Linux binary in ELF format?
4 Answers
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CPU Privilege Rings: Why rings 1 and 2 aren't used?
...2 were diminished greatly.
The intent by Intel in having rings 1 and 2 is for the OS to put device drivers at that level, so they are privileged, but somewhat separated from the rest of the kernel code.
Rings 1 and 2 are in a way, "mostly" privileged. They can access supervisor pages, but if they ...
How to create full compressed tar file using Python?
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To build a .tar.gz (aka .tgz) for an entire directory tree:
import tarfile
import os.path
def make_tarfile(output_filename, source_dir):
with tarfile.open(output_filename, "w:gz") as tar:
tar.add(source_dir, arcname=os.path.basename(source_d...
What is the fundamental difference between WebSockets and pure TCP?
...have control over the machines on that network and can open ports suitable for making the TCP connections.
Over the internet, you're communicating with someone else's server on the other end. They are extremely unlikely to have any old socket open for connections. Usually they will have only a few ...
Apache: “AuthType not set!” 500 Error
...le since I used the Apache httpd web server. I'm firing up a local server for a project and when I try to request localhost/index.html, I get a 500 error and I see this in the error log:
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Open files in 'rt' and 'wt' modes
Several times here on SO I've seen people using rt and wt modes for reading and writing files.
4 Answers
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