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How do you extract a column from a multi-dimensional array?
...the third columm
array([3, 7])
See also: "numpy.arange" and "reshape" to allocate memory
Example: (Allocating a array with shaping of matrix (3x4))
nrows = 3
ncols = 4
my_array = numpy.arange(nrows*ncols, dtype='double')
my_array = my_array.reshape(nrows, ncols)
...
How come an array's address is equal to its value in C?
...ointer which was initially assigned to point to to the first element of an allocation of the given size, so if that name appeared in the argument list for a function, the function would receive a pointer to the vector. Even though C added "real" array types, whose name was rigidly associated with t...
How do I export UIImage array as a movie?
...riter:
NSError *error = nil;
AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
[NSURL fileURLWithPath:somePath] fileType:AVFileTypeQuickTimeMovie
error:&error];
NSParameterAssert(videoWriter);
NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
...
Maximum Java heap size of a 32-bit JVM on a 64-bit OS
...iB)");
}
}
This will report the "Max Memory" based upon default heap allocation. So you still would need to play with -Xmx (on HotSpot). I found that running on Windows 7 Enterprise 64-bit, my 32-bit HotSpot JVM can allocate up to 1577MiB:
[C:scratch]> java -Xmx1600M MaxMemory
Error occu...
Verifying signed git commits?
...
These are several similar status codes:
- TRUST_UNDEFINED <error_token>
- TRUST_NEVER <error_token>
- TRUST_MARGINAL [0 [<validation_model>]]
- TRUST_FULLY [0 [<validation_model>]]
- TRUST_ULTIMATE [0 [<validation_model>]]
For good signatur...
What exactly does stringstream do?
...ic and int, blank delimited in mystr.
You then tried to convert the first token (blank delimited) into an int.
The first token was RS which failed to convert to int, leaving a zero for myprice, and we all know what zero times anything yields.
When you only entered int values the second time, ever...
How to convert std::string to NSString?
...ng stringWithUTF8String:param.c_str()];
NSString* alternative = [[NSString alloc] initWithUTF8String:param.c_str()];
This will work in most cases - and if you're not doing specific encoding detection and conversion, UTF-8 is going to give you a good result for having non-latin characters 'just wor...
iPhone/iOS JSON parsing tutorial [closed]
...
SBJSON *parser = [[SBJSON alloc] init];
NSString *url_str=[NSString stringWithFormat:@"Example APi Here"];
url_str = [url_str stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURLRequest *request =[NSURLRequest requestWithURL:[NSUR...
Creating an empty Pandas DataFrame, then filling it?
...op iterating through column names. In the former case, not only the memory allocation takes time, but replacing NaNs with new values seems extremely slow.
– deeenes
Mar 3 '15 at 16:33
...
What is the difference between an int and an Integer in Java and C#?
...by reference (or more accurately have references passed by value), and are allocated from the heap. Conversely, primitives are immutable types that are passed by value and are often allocated from the stack.
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