multidimensional-array

问题 I use the following code to create a numpy-ndarray. The file has 9 columns. I explicitly type each column: dataset = np.genfromtxt("data.csv", delimiter=",",dtype=('|S1', float, float,float,float,float,float,float,int)) Now I would like to get some descriptive statistics for each column (min, max, stdev, mean, median, etc.). Shouldn't there be an easy way to do this? I tried this: from scipy import stats stats.describe(dataset) but this returns an error: TypeError: cannot perform reduce with

问题 I am Having an mutidimensional array getting result like given below Array ( [0] => Array ( [0] => 70 ) [1] => Array ( [0] => 67 ) [2] => Array ( [0] => 75 [1] => 73 [2] => 68 ) [3] => Array ( [0] => 68 ) [4] => Array ( [0] => 76 ) ) But I need to convert it to single array And I want to convert in to single dimensional array as Array ( [0] => 70 [1] => 67 [2] => 75 [3] => 73 [4] => 68 [5] => 68 [6] => 76 ) How to convert it using php functions? Or Is there any other way to do it? 回答1: You

问题 I have an array of objects as folllows [ {"width":128.90663423245883,"height":160,"X":0,"Y":140}, {"width":277.0938568683375,"height":263,"X":128.90663423245883,"Y":37}, {"width":264.8267031014369,"height":261,"X":277.0938568683375,"Y":39}, {"width":229.14003389179788,"height":60,"X":264.8267031014369,"Y":240}, {"width":10.032771905968888,"height":177,"X":229.14003389179788,"Y":123} ] I am looking to write a function that gets the sum of all 'width' elements in the object before the current.

问题 I'm trying to push objects into an array to end up with an object array like this: [ {"recipient_name":"John D", "phone_number":"123456"}, {"recipient_name":"Doe J", "phone_number":"654321"}, {"recipient_name":"Jon Do", "phone_number":"112233"}, ] So I'm looping over a larger array to acquire the names and phone numbers and pushing them as an object to an array like this: $myLargerArray = pg_fetch_all($messageQuery); // This is my larger array $size = count($myLargerArray); for( $j = 0; $j <

问题 This work: var stepFunc = [ //Step 0 (it doe not exist) function(){console.log("Step 0");}, //Step 1 (function(){ var fFirstTime = true; return function(){ console.log("Step 1"); if (fFirstTime){ //Do Something } } })(), // ... Other steps ]; This does NOT work : var stepFunc = [ // Step 0 [ function(){console.log("Step 0");}, function(){console.log("Check Step 0");} ], //Step 1 (function(){ var fFirstTime = true; return [ function() { //Initialization function console.log("Step 1"); if

问题 This work: var stepFunc = [ //Step 0 (it doe not exist) function(){console.log("Step 0");}, //Step 1 (function(){ var fFirstTime = true; return function(){ console.log("Step 1"); if (fFirstTime){ //Do Something } } })(), // ... Other steps ]; This does NOT work : var stepFunc = [ // Step 0 [ function(){console.log("Step 0");}, function(){console.log("Check Step 0");} ], //Step 1 (function(){ var fFirstTime = true; return [ function() { //Initialization function console.log("Step 1"); if

问题 I'm new to Java8 and I can't use streams to map one array into another 2 dimensional array. I have one 2-dimensional array which is a pattern: boolean[][] pattern = { {true, true, false}, {true, false, true}, {false, true, true} }; And second array which contains keys. 0 means: take 0-element from pattern 1 means: take 1-element from pattern and so on int[] keys = {2, 1, 0}; From these 2 arrays I'd like to produce another 2-dimensional array. In this case the result will look like this:

问题 Why can we omit the first dimension of a multidimensional array when we are passing it to a function? In my programming class, we were told what when passing a multidimensional array to a function we can omit first dimension, for example, a[10][15][20] can be passed as a[][15][20] . Why? 回答1: Because the array will decay to pointer and to calculate offset to the elements of the array you do not need to know the innermost dimension. Offset to a[i][j][k] is i*nj*nk+j*nk+k (where nj and nk are

问题 Why can we omit the first dimension of a multidimensional array when we are passing it to a function? In my programming class, we were told what when passing a multidimensional array to a function we can omit first dimension, for example, a[10][15][20] can be passed as a[][15][20] . Why? 回答1: Because the array will decay to pointer and to calculate offset to the elements of the array you do not need to know the innermost dimension. Offset to a[i][j][k] is i*nj*nk+j*nk+k (where nj and nk are

问题 Say i have a multidimensional array. For example: Array ( [0] => Array ( [animal_id] => 5494 [animal_name] => "Suzy" [animal_type] => "zebra" [animal_location] => 0 [animal_awake] => 1 [animal_age] => 3 ) [1] => Array ( [animal_id] => 5494 [animal_name] => "Joshua" [animal_type] => "panda" [animal_location] => 5 [animal_awake] => 0 [animal_age] => 8 ) [2] => Array ( [animal_id] => 5494 [animal_name] => "Debra" [animal_type] => "snake" [animal_location] => 7 [animal_awake] => 1 [animal_age] =>