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How to check BLAS/LAPACK linkage in NumPy and SciPy?
I am builing my numpy/scipy environment based on blas and lapack more or less based on this walk through.
5 Answers
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Combining two lists and removing duplicates, without removing duplicates in original list
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Finally an answer that doesn't involve casting into sets! Kudos.
– SuperFamousGuy
Mar 25 '13 at 18:33
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How do I list all the columns in a table?
...'t work. The column_name was printed but nothing else. I had to use SELECT CAST(COLUMN_NAME AS CHAR(40)) || ' ' || DATA_TYPE to get a nice format and obtain multiple columns with concatenation.
– Eamonn Kenny
Apr 25 '19 at 11:29
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Difference between Service, Async Task & Thread?
...em are used to do some stuff in background. So, how to decide which to use and when?
6 Answers
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Return rows in random order [duplicate]
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Here's an example (source):
SET @randomId = Cast(((@maxValue + 1) - @minValue) * Rand() + @minValue AS tinyint);
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Difference between two dates in MySQL
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If you are working with DATE columns (or can cast them as date columns), try DATEDIFF() and then multiply by 24 hours, 60 min, 60 secs (since DATEDIFF returns diff in days). From MySQL:
http://dev.mysql.com/doc/refman/5.5/en/date-and-time-functions.html
for example:
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How to update column with null value
... your column cannot be null, when you set the value to null it will be the cast value to it.
Here a example
mysql> create table example ( age int not null, name varchar(100) not null );
mysql> insert into example values ( null, "without num" ), ( 2 , null );
mysql> select * from example;
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Is there a conditional ternary operator in VB.NET?
...e types - see this answer as to why and this answer for a workaround which casts the argument before returning (CType(Nothing, DateTime?).
– KyleMit
Jan 17 '17 at 19:31
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How to use subprocess popen Python
...ata. A clever attacker can modify the input to access arbitrary system commands. E.g. by inputting filename.swf; rm -rf / for the value of filename. However, this is only a problem, when the contents of your argument to Popen is insecure.
– Hans Then
Sep 26 '12...
How to convert DateTime? to DateTime
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You can use a simple cast:
DateTime dtValue = (DateTime) dtNullAbleSource;
As Leandro Tupone said, you have to check if the var is null before
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