slice

I have a ndarray like this one: number_of_rows = 3 number_of_columns = 3 a = np.arange(number_of_rows*number_of_columns).reshape(number_of_rows,number_of_columns) a array([[0, 1, 2], [3, 4, 5], [6, 7, 8]]) But I want something like this: array([[0, 100, 101], [3, 102, 103], [6, 7, 8]]) To do that I want to avoid to do it one by one, I rather prefer to do it in arrays or matrices, because later I want to extend the code. Nothe I have change a submatrix of the initial matrix (in mathematical terms, in terms of this example ndarray). In the example the columns considered are [1,2] and the rows [0

I have an array which I want to slice in 4 other arrays because I want to display the content of the first array on four columns. I have tried the code above, but what I get is N columns with 4 items. $groups = array(); for ($i = 0; $i < count($menu); $i += 4) $groups[] = array_slice($menu, $i, 4); Can this be modified in order to get exactly 4 columns and distribute the values so they fit? Like Michael Berkowski suggested: $groups = array_chunk($menu,4); Should give you what you need. If you're more into "manual labour" : $groups = array(); while($groups[] = array_splice($menu,0,4)) {//no

This is my first post so please "Go" easy on me. :) ... I am quite familiar with many traditional programming languages but I am new to Go and having trouble understanding the use of slices and ranges. The program code and comments below illustrate my consternation. Thank you! package main import ( "fmt" "time" ) type myStruct struct { Name string Count int } Wrote my own Mod function because I could not find on in the Go libraries. func modMe(mod int, value int) int { var m int var ret int m = value / mod ret = value - m*mod return ret } func main() { mod := 4 cnt := 16 fmt.Printf("Record mod

I have the following array: var arr = ["Toyota", "Hyundai", "Honda", "Mazda"]; I want to slice each element backwards, like: var arr = ["Toyota", "Hyundai", "Honda", "Mazda"].slice(-2); so it will return: arr = ["Toyo", "Hyund", "Hon", "Maz"]; Is it possible? or is there anyway of doing this? You can't use slice directly, as it has a different meaning with an array and will return you a list of array elements. var arr = ["Toyota", "Hyundai", "Honda", "Mazda"] arr.slice(0, -2) // returns the elements ["Toyota", "Hyundai"] In order to do the slice on each element, you can use .map() (on IE9+):

I was reading through Go's compress/flate package, and I found this odd piece of code [1]: n := int32(len(list)) list = list[0 : n+1] list[n] = maxNode() In context, list is guaranteed to be pointing to an array with more data after. This is a private function, so it can't be misused outside the library. To me, this seems like a scary hack that should be a runtime exception. For example, the following D code generates a RangeError: auto x = [1, 2, 3]; auto y = x[0 .. 2]; y = y[0 .. 3]; Abusing slices could be done more simply (and also look more safe) with the following: x := []int{1, 2, 3} y

I have a sound signal, imported as a numpy array and I want to cut it into chunks of numpy arrays. However, I want the chunks to contain only elements above a threshold. For example: threshold = 3 signal = [1,2,6,7,8,1,1,2,5,6,7] should output two arrays vec1 = [6,7,8] vec2 = [5,6,7] Ok, the above are lists, but you get my point. Here is what I tried so far, but this just kills my RAM def slice_raw_audio(audio_signal, threshold=5000): signal_slice, chunks = [], [] for idx in range(0, audio_signal.shape[0], 1000): while audio_signal[idx] > threshold: signal_slice.append(audio_signal[idx])