indexed

问题 I use a simple line to break an indexed image 256 color into palette using import numpy as np from PIL import Image im = Image.open('') palette = np.array(im.getpalette(),dtype=np.uint8).reshape((256,3)) ##################### Printed result [[ 1 3 0] [ 2 4 1] [ 28 0 4] [ 20 2 26] [ 24 5 18] [ 33 7 22] [ 36 7 12] [ 0 20 18] [ 42 15 16] [ 43 18 30] ... etc Printing 'palette' lists the colors as RGB values as listed from index 0 onward. Index 0 is often dark color or black. In some engines it is

问题 I know materialized view and I'm using it. I have never used indexed views but I will. What are the differences between them ? 回答1: SQL Server’s indexed views are always kept up to date. In SQL Server, if a view’s base tables are modified, then the view’s indexes are also kept up to date in the same atomic transaction. Oracle provides something similar called a materialized view. If Oracle’s materialized views are created without the **REFRESH FAST ON COMMIT** option, then the materialized

问题 I'm using the following query to return all duplicate records with the same first and last name. The trick is that the contact_id, has to be in descending order. The query returns the contacts as expected, but it is just SO SLOW! Takes about 6-8 seconds when checking around 30,000 records. I have the contact_firstName, contact_lastName, contact_client_id, and contact_id all indexed in the database. Any ideas what I could do to try and speed this up a bit? Thanks for your help :) SELECT z

问题 I need somebody help me to figure out the cause of following deadlock. the involved tables are parent/child and child table has indexed FK. parent:PK_FMS_FC_MAIN_FLD_INPUT_LIMIT chile:FMS_FC_REL_FLD_INPUT_LIMIT Deadlock graph: ---------Blocker(s)-------- ---------Waiter(s)--------- Resource Name process session holds waits process session holds waits TX-0019000b-0000b486 22 2755 X 57 492 S TX-00010019-00061e13 57 492 X 22 2755 S session 2755: DID 0001-0016-00000FCE session 492: DID 0001-0039

问题 I have a 1 TB, 600m row, table which has a misguided choice of indexed columns, specifically a clustered index on the primary key column which is never used in a select query. I want to remove the clustered index from this row and create it on a number of other rows. Table is currently like this: colA (PK, nvarchar(3)) [clustered index pt b] colB (PK, bigint) [clustered index pt a] colC (DateTime) [non-clustered index] colD (Money) [non-clustered index] colE (bit) [no index] colF (bit) [no

问题 I need to join 2 PNG images, with 16 color palette, keep colors number and order as originals. Both PNGs use the same 16 color palette. There is a way to create 4 bit indexed PNG with all colors, in exact order, even unused in each PNG? Edit to be more clear: I have 2 pictures. The first is "level-000.png": It is identified as: Image: level-000.png Format: PNG (Portable Network Graphics) Mime type: image/png Class: PseudoClass Geometry: 144x144+0+0 Resolution: 28.35x28.35 Print size: 5

问题 i'm trying to edit the pixels of a 8bpp. Since this PixelFormat is indexed i'm aware that it uses a Color Table to map the pixel values. Even though I can edit the bitmap by converting it to 24bpp, 8bpp editing is much faster (13ms vs 3ms). But, changing each value when accessing the 8bpp bitmap results in some random rgb colors even though the PixelFormat remains 8bpp. I'm currently developing in c# and the algorithm is as follows: (C#) 1- Load original Bitmap at 8bpp 2- Create Empty temp

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . E.g. Array: {1, 5, 2, 3, 2, 10} Range: 0-1 Answer: 5 Range: 2-4 Answer: 3 Range: 0-5 Answer: 10 etc. 回答1: If the array is not sorted,

问题 I came up with an idea that requires to bind thousands of buffers (Atomic counters and Shader storage ones) to one GLSL program. I first checked if this would make any sense in the limitations of openGL and it seems possible for two reasons : On my laptop GL_MAX_ATOMIC_COUNTER_BUFFER_BINDINGS and GL_MAX_SHADER_STORAGE_BUFFER_BINDINGS both are around 32k. So openGL is enclined to let me bind thousands of buffers for one pass. openGL 4.4 comes up with : void BindBuffersBase(enum target, uint

问题 Is the following: $arr = [ foo => 'bar', bar => 'foo' ]; The same as: $arr = [ 'foo' => 'bar', 'bar' => 'foo' ]; In other words, is putting quotes on named indexes unnecessary? When would be the only times when putting quotes on string indexes be really needed? 回答1: Your first example should throw a NOTICE . If you do not use quotes then PHP will look for a constant with that name. php > $myArr = [abc => 'hello']; PHP Notice: Use of undefined constant abc - assumed 'abc' in php shell code on