multidimensional-array

问题 How can I extract a specific field from each element of a Matlab struct array? >> clear x >> x(1).a = 6; >> x(2).a = 7; I'd like an array containing 6 and 7. Neither x(:).a nor x.a do what I want. >> x(:).a ans = 6 ans = 7 回答1: No problem - just use : arr = [x.a]; It will concat all of the values that you need. If you have a more complex data, you can use the curly bracers: b(1).x = 'John'; b(2).x = 'Doe'; arr = {b.x}; 回答2: For a multi-dimensional array, you need reshape([x.a], size(x)) 回答3:

问题 I have a function in C++ (call it "weightmatrix") that takes a vector of size n as input, which contains a series of numbers a , b , c ..., and returns an n -dimensional vector made up of subvectors of size c, b, a... That was complicated sounding. Basically, in practice it should look like this: vector<int> vector_sizes = {2, 3, 1}; cout << "Resulting matrix: " << weightmatrix(vector_sizes); // Function takes vector of size 3 /* Returns the following 3 dimensional matrix: { { {0, 0}, {0, 0},

问题 I am extracting cells out of a spreadsheet using the Interopt.Excel API. When I call: object[,] rangeValues = (object[,])range.get_Value(XlRangeValueDataType.xlRangeValueDefault); And set a breakpoint and inspect rangeValues , I see elements starting at [1,1] "foo", [1,2] "bar", etc. However, if I do string[,] test = new string[2, 2] { { "one", "two" }, { "three", "four" } }; The elements start at [0,0]. How does the Excel API construct a multidimensional array w/ empty elements? I tried

问题 My code is $urltopost = "http://example.com/webservice/service.php"; $datatopost = array (0 =>array('a'=>'b','c'=>'d'),1 =>array('a'=>'b','c'=>'d'),2 =>array('a'=>'b','c'=>'d'),3 =>array('a'=>'b','c'=>'d')); $ch = curl_init ($urltopost); curl_setopt($ch, CURLOPT_HTTPHEADER, ['Content-Type: application/json']); curl_setopt($ch, CURLOPT_HEADER, true); curl_setopt ($ch, CURLOPT_POST, true); curl_setopt ($ch, CURLOPT_POSTFIELDS, json_encode($datatopost)); curl_setopt ($ch, CURLOPT_RETURNTRANSFER,

问题 I'd like to create a multidimensional array using a loop in jQuery/JS. Is it possible to use the next available key instead of setting it manually? jsonFromPhp contains something like this: 0 {first_name: "Tom", last_name: "Smith", location: "London"} 1 {first_name: "Max", last_name: "Muster", location: "Zurich"} 2 {first_name: "Joanne", last_name: "Kate", location: "London"} ... Here is the loop: jsonFromPhp.forEach((row, i) => { if (row['location'] == 'London') { firstKey = 0; } else {

问题 I'd like to create a multidimensional array using a loop in jQuery/JS. Is it possible to use the next available key instead of setting it manually? jsonFromPhp contains something like this: 0 {first_name: "Tom", last_name: "Smith", location: "London"} 1 {first_name: "Max", last_name: "Muster", location: "Zurich"} 2 {first_name: "Joanne", last_name: "Kate", location: "London"} ... Here is the loop: jsonFromPhp.forEach((row, i) => { if (row['location'] == 'London') { firstKey = 0; } else {

问题 Using PyTorch, I have trained a simple multiclass classifier and I want to convert it to CoreML model format. It is converted, but there's an issue. I've searched quite exhaustively but most frequent questions, pertaining to mlmodel's inputs, are only about how to change the format of the input of mlmodel from MLMultiArray to UIImage because they must be working with images. But if my model expects a UIImage as input whereas I have multiarray type data, how can I change the model's input so

问题 I have a 3d array, the first level array can have one to many items (arrays). Each inner array has a fixed length, and its elements are also arrays of fixed length. In the example below length 3 and 3 respectively. I would like sum the respective inner arrays, [1+1+1, 2+2+2, 3+3+3]. The output should be a 2d array with a 3 x 3 shape. let arr = [ [ [1, 2, 3], [4, 5, 6], [7, 8, 9] ], [ [1, 2, 3], [4, 5, 6], [7, 8, 9] ], [ [1, 2, 3], [4, 5, 6], [7, 8, 9] ], ]; //expected output = [[3,6,9],[12,15

问题 Trying to learn multidimensional arrays but seem to constantly struggle with accessing them. I still have not got grasps of how you access them using index, keys, values. How do I get to the actual word "Title" and it's value? Here I have one I was playing with. $shop = array( array( "Title" => "rose", "Price" => 1.25, "Number" => 15 ), array( "Title" => "daisy", "Price" => 0.75, "Number" => 25, ), array( "Title" => "orchid", "Price" => 1.15, "Number" => 7 ) ); Which prints a structure such

问题 I would like to call those row with same index. so this is the example data frame, arrays = [np.array(['bar', 'bar', 'baz', 'baz', 'foo', 'foo', 'qux', 'qux']), np.array(['one', 'two', 'one', 'two', 'one', 'two', 'one', 'two'])] df = pd.DataFrame(np.random.randn(8, 4), index=arrays) In [16]: df Out[16]: 0 1 2 3 bar one -0.424972 0.567020 0.276232 -1.087401 two -0.673690 0.113648 -1.478427 0.524988 baz one 0.404705 0.577046 -1.715002 -1.039268 two -0.370647 -1.157892 -1.344312 0.844885 foo one