yourarray.shape or np.shape() or np.ma.shape() returns the shape of your ndarray as a tuple; And you can get the (number of) dimensions of your array using yourarray.ndim or np.ndim(). (i.e. it gives the n of the ndarray since all arrays in NumPy are just n-dimensional arrays (shortly called as ndarrays)) For a 1D array, the … Read more
It’s not an array. var json = {“cool”:”34.33″,”alsocool”:”45454″}; json.coolness = 34.33; or var json = {“cool”:”34.33″,”alsocool”:”45454″}; json[‘coolness’] = 34.33; you could do it as an array, but it would be a different syntax (and this is almost certainly not what you want) var json = [{“cool”:”34.33″},{“alsocool”:”45454″}]; json.push({“coolness”:”34.33″}); Note that this variable name is highly misleading, … Read more
If you debug your program by simply printing ax, you’ll quickly find out that ax is a two-dimensional array: one dimension for the rows, one for the columns. Thus, you need two indices to index ax to retrieve the actual AxesSubplot instance, like: ax[1,1].plot(…) If you want to iterate through the subplots in the way … Read more
Interesting question, This will do the trick db.multiArr.find({‘Keys’:{$elemMatch:{$elemMatch:{$in:[‘carrot’]}}}}) $elemMatch used to check if an element in an array matches the specified match expression. so nested $elemMatch will go deeper into nested arrays Test data db.multiArr.insert({“ID” : “fruit1″,”Keys” : [[“apple”, “carrot”, “banana”]]}) db.multiArr.insert({“ID” : “fruit2″,”Keys” : [[“apple”, “orange”, “banana”]]}) db.multiArr.find({‘Keys’:{$elemMatch:{$elemMatch:{$in:[‘carrot’]}}}}) { “_id” : ObjectId(“506555212aeb79b5f7374cbf”), … Read more
You can use numpy.pad, as follows: >>> import numpy as np >>> a=[[1,2],[3,4]] >>> np.pad(a, ((0,0),(0,3)), mode=”constant”, constant_values=0) array([[1, 2, 0, 0, 0], [3, 4, 0, 0, 0]]) Here np.pad says, “Take the array a and add 0 rows above it, 0 rows below it, 0 columns to the left of it, and 3 columns … Read more
You have it right, and it does feel a bit backwards. The row number is a y coordinate, and the column number is an x coordinate, and yet we usually write row,col but we also usually write x,y. Whether you want to write your array as [y][x] or [x][y] depends mostly on how much you … Read more
Java only actually implements single dimensional arrays. It has multi-dimensional types, however two dimensional arrays are actually implemented as an array of arrays. Each array has an overhead of about 16 bytes. You are better off with int[2][x] to minimise overhead. You can avoid this issue entirely by using helper methods. final int[] array = … Read more
Since Java 8, using the streams API: int[][] copy = Arrays.stream(matrix).map(int[]::clone).toArray(int[][]::new);
To get a specific row or column from the multidimensional array you can use some LINQ: public class CustomArray<T> { public T[] GetColumn(T[,] matrix, int columnNumber) { return Enumerable.Range(0, matrix.GetLength(0)) .Select(x => matrix[x, columnNumber]) .ToArray(); } public T[] GetRow(T[,] matrix, int rowNumber) { return Enumerable.Range(0, matrix.GetLength(1)) .Select(x => matrix[rowNumber, x]) .ToArray(); } }
Just pass headers: true CSV.foreach(data_file, headers: true) do |row| puts row.inspect # hash end From there, you can manipulate the hash however you like. (Tested with Ruby 2.0, but I think this has worked for quite a while.) Edit You say you don’t have any headers – could you add a header line to the … Read more