Checking if a string array contains a value, and if so, getting its position
You could use the Array.IndexOf method:
arrays
Double pointer array in c++
You probably well know that double* is a pointer to a double element. In the same way, double** is a pointer to a double* element, which is itself a pointer. Again, double*** is a pointer to a double** element, and so on. When you instanciate an array to a type T, you usually do new T [size];. For example, for an array of double, you write new double[size];. If your type T is … Read more
Showing an image from an array of images – Javascript
Just as Diodeus said, you’re comparing an Image to a HTMLDomObject. Instead compare their .src attribute:
Finding the size of a char array in Java
You can use b.length to find out how many characters there are. This is only the number of characters, not indexing, so if you iterate over it with a for loop, remember to write it like this: Note the < (not a <=). It’s also important to note that since the array isn’t a class, .length isn’t a function, so you shouldn’t have … Read more
What are the differences between numpy arrays and matrices? Which one should I use?
Numpy matrices are strictly 2-dimensional, while numpy arrays (ndarrays) are N-dimensional. Matrix objects are a subclass of ndarray, so they inherit all the attributes and methods of ndarrays. The main advantage of numpy matrices is that they provide a convenient notation for matrix multiplication: if a and b are matrices, then a*b is their matrix product. On the other hand, as … Read more
int cannot be converted to int []
you need to assign to an array element, but you were doing it wrong.
Root mean square of a function in python
I’m going to assume that you want to compute the expression given by the following pseudocode: i.e. the square root of the mean of the squared values of elements of y. In numpy, you can simply square y, take its mean and then its square root as follows: So, for example: Do clarify your question … Read more
use Lodash to sort array of object by value
This method orderBy does not change the input array, you have to assign the result to your array :
What is the difference between array and enum in C ?
Array is a variable that can contain multiple elements with index starting from 0 whereas enum is an user defined datatype that contains a list of members for which an integer constant is assigned starting from 0. in case of enum the numbers starting from 0 are not indexes whereas in case of an array they are indexes. … Read more
Multi-dimensional arrays in Bash
Bash does not support multidimensional arrays, nor hashes, and it seems that you want a hash that values are arrays. This solution is not very beautiful, a solution with an xml file should be better : EDIT: this answer is quite old, since since bash 4 supports hash tables, see also this answer for a solution without … Read more