Dump a NumPy array into a csv file
numpy.savetxt saves an array to a text file.
arrays
How to convert List to int[] in Java?
Unfortunately, I don’t believe there really is a better way of doing this due to the nature of Java’s handling of primitive types, boxing, arrays and generics. In particular: List<T>.toArray won’t work because there’s no conversion from Integer to int You can’t use int as a type argument for generics, so it would have to be an int-specific method (or one which used reflection to do … Read more
what does “>>>” mean in java?
The >>> operator is the unsigned right bit-shift operator in Java. It effectively divides the operand by 2 to the power of the right operand, or just 2 here. The difference between >> and >>> would only show up when shifting negative numbers. The >> operator shifts a 1 bit into the most significant bit if it was a 1, and the >>> shifts in a 0 regardless. UPDATE: Let’s average 1 and 2147483647 (Integer.MAX_VALUE). We can do the … Read more
Convert a PHP object to an associative array
Just typecast it From Arrays: If an object is converted to an array, the result is an array whose elements are the object’s properties. The keys are the member variable names, with a few notable exceptions: integer properties are unaccessible; private variables have the class name prepended to the variable name; protected variables have a ‘*’ … Read more
C++ error: “Array must be initialized with a brace enclosed initializer”
The syntax to statically initialize an array uses curly braces, like this: This will zero-initialize the array. For multi-dimensional arrays, you need nested curly braces, like this: Note that Array_size must be a compile-time constant for this to work. If Array_size is not known at compile-time, you must use dynamic initialization. (Preferably, an std::vector).
How to access the ith column of a NumPy multidimensional array?
Similarly, lets you access rows. This is covered in Section 1.4 (Indexing) of the NumPy reference. This is quick, at least in my experience. It’s certainly much quicker than accessing each element in a loop.
Why is using “for…in” for array iteration a bad idea?
The reason is that one construct: can sometimes be totally different from the other: Also consider that JavaScript libraries might do things like this, which will affect any array you create:
How to check if array is empty or does not exist?
You want to do the check for undefined first. If you do it the other way round, it will generate an error if the array is undefined. Update This answer is getting a fair amount of attention, so I’d like to point out that my original answer, more than anything else, addressed the wrong order of the … Read more
Reverse Contents in Array
This would be my approach:
method in class cannot be applied to given types
generateNumbers() expects a parameter and you aren’t passing one in! generateNumbers() also returns after it has set the first random number – seems to be some confusion about what it is trying to do.