a[x:y:z] gives the same result as a[slice(x, y, z)]. One of the advantages of a slice object is that it can be stored and retrieved later as a single object instead of storing x, y and z. It is often used to let the user define their own slice that can later be applied on … Read more
You don’t need to make new slices, just append slices of logs to the divided slice. http://play.golang.org/p/vyihJZlDVy var divided [][]string chunkSize := (len(logs) + numCPU – 1) / numCPU for i := 0; i < len(logs); i += chunkSize { end := i + chunkSize if end > len(logs) { end = len(logs) } divided … Read more
The syntax is: a[start:stop] # items start through stop-1 a[start:] # items start through the rest of the array a[:stop] # items from the beginning through stop-1 a[:] # a copy of the whole array There is also the step value, which can be used with any of the above: a[start:stop:step] # start through not … Read more
You can take a look at the code here. I think the function is similar to what you are trying to solve. The function extracts an arbitrary plane from a volume given the size of the plane, the center point of the plane, and the plane normal, i.e. [A,B,C]. It also outputs the volumetric index … Read more
If you want a collection of unique elements, that is the Set data type. Go does not have a builtin set data type, but you can use a map to act as a set: keys in a map must be unique. For a “nice” set, use a map with bool value type (with true values) … Read more
In composite literals the key (index in case of array and slice literals) can be optionally provided. For array and slice literals the following rules apply: Each element has an associated integer index marking its position in the array. An element with a key uses the key as its index; the key must be a … Read more
The slice header is represented by the reflect.SliceHeader type: type SliceHeader struct { Data uintptr Len int Cap int } You may use package unsafe to convert a slice pointer to *reflect.SliceHeader like this: sh := (*reflect.SliceHeader)(unsafe.Pointer(&newSlice2)) And then you may print it like any other structs: fmt.Printf(“%+v”, sh) Output will be (try it on … Read more
This all depends on the actual implementation used, but I’m basing this on the standard Go as well as gccgo. Slices Reslicing means changing an integer in a struct (a slice is a struct with three fields: length, capacity and pointer to backing memory). If the slice does not have sufficient capacity, append will need … Read more
An efficient way to “patchify” an array, that is, to get an array of windows to the original array is to create a view with custom strides, the number of bytes to jump to the following element. It can be helpful to think of a numpy array as a (glorified) chunk of memory, and then … Read more
TL;DR: There is likely a typo or spelling error in the column header names. This is a change introduced in v0.21.1, and has been explained in the docs at length – Previously, selecting with a list of labels, where one or more labels were missing would always succeed, returning NaN for missing labels. This will … Read more