Python Pandas – Changing some column types to categories
Sometimes, you just have to use a for-loop: for col in [‘parks’, ‘playgrounds’, ‘sports’, ‘roading’]: public[col] = public[col].astype(‘category’)
multiple-columns
Select NOT IN multiple columns
I’m not sure whether you think about: select * from friend f where not exists ( select 1 from likes l where f.id1 = l.id and f.id2 = l.id2 ) it works only if id1 is related with id1 and id2 with id2 not both.
IntelliJ Column Selection using Cursor Keys
You can do column editing using the Edit | Column Selection Mode. The shortcut to turn it on/off is Alt+Shift+Insert. You navigate with arrow keys to select blocks of text.
How to print third column to last column?
…or a simpler solution: cut -f 3- INPUTFILE just add the correct delimiter (-d) and you got the same effect.
Combine two or more columns in a dataframe into a new column with a new name
Use paste. df$x <- paste(df$n,df$s) df # n s b x # 1 2 aa TRUE 2 aa # 2 3 bb FALSE 3 bb # 3 5 cc TRUE 5 cc
LINQ to SQL: Multiple joins ON multiple Columns. Is this possible?
Joining on multiple columns in Linq to SQL is a little different. var query = from t1 in myTABLE1List // List<TABLE_1> join t2 in myTABLE1List on new { t1.ColumnA, t1.ColumnB } equals new { t2.ColumnA, t2.ColumnB } … You have to take advantage of anonymous types and compose a type for the multiple columns you … Read more
Unique Key constraints for multiple columns in Entity Framework
With Entity Framework 6.1, you can now do this: [Index(“IX_FirstAndSecond”, 1, IsUnique = true)] public int FirstColumn { get; set; } [Index(“IX_FirstAndSecond”, 2, IsUnique = true)] public int SecondColumn { get; set; } The second parameter in the attribute is where you can specify the order of the columns in the index. More information: MSDN
Scrolling a flexbox with overflowing content
I’ve spoken to Tab Atkins (author of the flexbox spec) about this, and this is what we came up with: HTML: <div class=”content”> <div class=”box”> <div class=”column”>Column 1</div> <div class=”column”>Column 2</div> <div class=”column”>Column 3</div> </div> </div> CSS: .content { flex: 1; display: flex; overflow: auto; } .box { display: flex; min-height: min-content; /* needs vendor … Read more
Apply pandas function to column to create multiple new columns?
I usually do this using zip: >>> df = pd.DataFrame([[i] for i in range(10)], columns=[‘num’]) >>> df num 0 0 1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9 >>> def powers(x): >>> return x, x**2, x**3, x**4, x**5, x**6 >>> df[‘p1’], df[‘p2’], df[‘p3’], df[‘p4’], df[‘p5’], … Read more
How do I change Bootstrap 3 column order on mobile layout?
You cannot change the order of columns in smaller screens but you can do that in large screens. So change the order of your columns. <!–Main Content–> <div class=”col-lg-9 col-lg-push-3″> </div> <!–Sidebar–> <div class=”col-lg-3 col-lg-pull-9″> </div> By default this displays the main content first. So in mobile main content is displayed first. By using col-lg-push … Read more