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Checking images for similarity with OpenCV
...ive error between images.
double errorL2 = norm( A, B, CV_L2 );
// Convert to a reasonable scale, since L2 error is summed across all pixels of the image.
double similarity = errorL2 / (double)( A.rows * A.cols );
return similarity;
}
else {
//Images have a different size
ret...
Hook up Raspberry Pi via Ethernet to laptop without router? [closed]
...how-to-set-up-raspberry-pi-without-a-monitor/54393#54393
UART serial USB converter
This is an alternative to SSH if you just want to get a shell on the Pi: https://en.wikipedia.org/wiki/Serial_port
This does not use SSH or networking itself, but rather the older, simpler, more direct, more relia...
How to iterate over rows in a DataFrame in Pandas
...ating over multiple columns" example needs a caveat: DataFrame.values will convert every column to a common data type. DataFrame.to_numpy() does this too. Fortunately we can use zip with any number of columns.
– David Wasserman
Jan 16 at 20:44
...
Most useful NLog configurations [closed]
...
Some of these fall into the category of general NLog (or logging) tips rather than strictly configuration suggestions.
Here are some general logging links from here at SO (you might have seen some or all of these already):
log4net vs. Nlog
L...
Effects of changing Django's SECRET_KEY
I made a mistake and committed my Django project's SECRET_KEY into a public repository.
5 Answers
...
Rails update_attributes without save?
...ed, and they are to a degree, but this type of error can easily occur when converting data from an API, or even just using a series of data transformation and forgetting to Hash[] the results of the final .map. Maintain some code 50 lines above and 3 functions removed from your attribute assignment...
Is there a way to crack the password on an Excel VBA Project?
...ch worked for me on a .xlsm file. I saved it as a .xls, did this, and then converted it back to .xlsm. It should be noted you can safely increase the length of the file if the new CMG... string is longer than the original.
– Drew Chapin
May 10 '16 at 16:33
...
Why does C++ need a separate header file?
...hat the compilation environment for C++ is based so closely on that of C.
Converting my comments to answer your follow-up question:
How does the compiler find the .cpp file with the code in it
It doesn't, at least not at the time it compiles the code that used the header file. The functions y...
MyISAM versus InnoDB [closed]
...ns of MySQL. Not that a MyISAM table that uses FULLTEXT indexing cannot be converted to an InnoDB table.
Conclusion
In conclusion, InnoDB should be your default storage engine of choice. Choose MyISAM or other data types when they serve a specific need.
...
Lock, mutex, semaphore… what's the difference?
... enter, this can be used for example to limit the number of cpu, io or ram intensive tasks running at the same time.
For a more detailed post about the differences between mutex and semaphore read here.
You also have read/write locks that allows either unlimited number of readers or 1 writer at an...