crosstab

问题 Both the pandas.crosstab and the Pandas pivot table seem to provide the exact same functionality. Are there any differences? 回答1: The main difference between the two is the pivot_table expects your input data to already be a DataFrame; you pass a DataFrame to pivot_table and specify the index / columns / values by passing the column names as strings. With cross_tab , you don't necessarily need to have a DataFrame going in, as you just pass array-like objects for index / columns / values .

问题 My real problem has to do with recording which of a very large number of anti-virus products agree that a given sample is a member of a given anti-virus family. The database has millions of samples, with tens of anti-virus products voting on each sample. I want to ask a query like "For the malware containing the name 'XYZ' which sample had the most votes, and which vendors voted for it?" and get results like: "BadBadVirus" V1 V2 V3 V4 V5 V6 V7 Sample 1 - 4 votes 1 0 1 0 0 1 1 Sample 2 - 5

问题 I have a PostgreSQL function (or table) which gives me the following output: Sl.no username Designation salary etc.. 1 A XYZ 10000 ... 2 B RTS 50000 ... 3 C QWE 20000 ... 4 D HGD 34343 ... Now I want the Output as below: Sl.no 1 2 3 4 ... Username A B C D ... Designation XYZ RTS QWE HGD ... Salary 10000 50000 20000 34343 ... How to do this? 回答1: Basing my answer on a table of the form: CREATE TABLE tbl ( sl_no int , username text , designation text , salary int ); Each row results in a new

问题 This is another question that is related to my previous post at my post here but with different problem. In my previous post, I ask on how I can create a crosstab query that will output a column based on 4 year range of copyright year. The answer was very good but now I am facing another challenge. To be clear here's the data on the table: ID CallNo CopyrightYear 1 AH 2000 2 AB 2000 3 BC 2001 4 AH 2000 5 ZA 2005 6 BC 2001 7 AP 2003 10 ZA 2006 11 DA 2009 12 DA 2010 13 RA 1999 14 WE 1997 15 HK

问题 Ok Access 2010 here. I have a crosstab, lets call it "TestCrosstab," that has a parameter to access a form control in the query it uses as a reference. It looks like this: PARAMETERS [Forms]![TestForm]![TextDaysPast] Short; TRANSFORM max(val) AS MaxValue SELECT col AS Criteria FROM (SELECT [Date], 'Crosstab Column Name 0' as Col, [Query Column Name 0] as val FROM TestQuery UNION ALL SELECT [Date], 'Crosstab Column Name 1' as Col, [Query Column Name 1] as val FROM TestQuery UNION ALL '... etc

问题 Consider this simple data set whose columns are cut by quantiles. kyle = pd.DataFrame({'foo':np.random.randint(0,100,100),'boo':np.random.randint(0,100,100)}) kyle.loc[:,'fooCut'] = pd.qcut(kyle.loc[:,'foo'], np.arange(0,1.1,.1)) kyle.loc[:,'booCut'] = pd.qcut(kyle.loc[:,'boo'], np.arange(0,1.1,.1)) Previous versions of Pandas handled the below as expected... pd.crosstab(kyle.fooCut,kyle.booCut) After updating to version '0.24.2', the above is throwing me a TypeError: Cannot cast array data

问题 I know there is a similar thread here already, but that doesn't work for me. Background: Jaspersoft Studio 6 I have a data set like this: Created a crosstab like this on this dataset: How to sort the column group to prod c, prod a, prod b instead of current? I tried put this expression in Order by expression of the column group. $F{product}.equals("prod c")? 1 : $F{product}.equals("prod a")? 2:3 But it says edit: added source, this is the version without sorting and it runs fine without error

问题 I realise it is possible to create a crosstab within sqlite, but is it possible to dynamically determine the relevant categories/columns at runtime rather than hardcoding them? Given the following example, it can get rather tedious ... SELECT shop_id, sum(CASE WHEN product = 'Fiesta' THEN units END) as Fiesta, sum(CASE WHEN product = 'Focus' THEN units END) as Focus, sum(CASE WHEN product = 'Puma' THEN units END) as Puma, sum(units) AS total FROM sales GROUP BY shop_id I managed to do this in

问题 This is a follow-up to my previous question: Get records for last 10 dates I have to generate reports for all books of a store along with sold count (if any) for the last N dates, by passing storeId. BOOK Book Sold Store ------------ -------------------- ---------------- Id Name SID Id Bid Count Date SID Name 1 ABC 1 1 1 20 11/12/2015 1 MNA 2 DEF 1 2 1 30 12/12/2015 2 KLK 3 DF2 2 3 2 20 11/12/2015 3 KJH 4 DF3 3 4 3 10 13/12/2015 5 GHB 3 5 4 5 14/12/2015 The number of days N is supplied by the

问题 I've been trying to hide column from a DB cross-tab in FastReport when the column header Value is 14001 ; but is not work down syntax !!! My Report Here's the code: procedure DBCross2OnCalcWidth(ColumnIndex: Integer; ColumnValues: Variant;var Width: Extended); begin if (VarToStr(ColumnValues[0]) = '14001') then Width := 0; end; 回答1: Try add procedure trigged on print and collection HeaderValues[0] procedure DBCross2OnPrintColumnHeader(Memo: TfrxMemoView; HeaderIndexes, HeaderValues, Value: