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How to randomize (or permute) a dataframe rowwise and columnwise?
...,]
> df2
a b c
3 0 1 0
4 0 0 0
2 1 0 0
1 1 1 0
By default sample() randomly reorders the elements passed as the first argument. This means that the default size is the size of the passed array. Passing parameter replace=FALSE (the default) to sample(...) ensures that sampling is done withou...
Remove everything after a certain character
...hoose everything up to that character? I'm getting the value from an href and up to the "?", and it's always going to be a different amount of characters.
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add created_at and updated_at fields to mongoose schemas
Is there a way to add created_at and updated_at fields to a mongoose schema, without having to pass them in everytime new MyModel() is called?
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Delete forked repo from GitHub
I'm starting with git and GitHub and there's a project I'm watching on GitHub. I unintentionally clicked to fork it. Now it appears as a new project to me.
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How to check file MIME type with javascript before upload?
I have read this and this questions which seems to suggest that the file MIME type could be checked using javascript on client side. Now, I understand that the real validation still has to be done on server side. I want to perform a client side checking to avoid unnecessary wastage of server res...
Visual Studio (2008) 'Clean Solution' Option
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It deletes all the compiled and temporary files associated with a solution. It ensures that the next build is a full one, rather than only changed files being recompiled.
share...
How to delete a row by reference in data.table?
...estion. data.table can't delete rows by reference yet.
data.table can add and delete columns by reference since it over-allocates the vector of column pointers, as you know. The plan is to do something similar for rows and allow fast insert and delete. A row delete would use memmove in C to budge u...
Tablix: Repeat header rows on each page not working - Report Builder 3.0
...porting Services does not recognize which textboxes are the column headers and setting RepeatColumnHeaders property to True doesn't work.
Instead, you need to:
Open Advanced Mode in the Groupings pane. (Click the arrow to the right of the Column Groups and select Advanced Mode.)
In the Row Gr...
Error in exception handler. - Laravel
...he or www-data, but this can vary between the different operating systems) and keep the permissions as of the directory as 775.
chgrp -R www-data app/storage
Or with chown.
chown -R :www-data app/storage
Then make sure directory permissions are 775.
chmod -R 775 app/storage
From the Laravel...
“The breakpoint will not currently be hit. The source code is different from the original version.”
...n debugging in Visual Studio, sometimes I add a breakpoint but it's hollow and VS says "The breakpoint will not currently be hit. The source code is different from the original version." Obviously this prevents me from being able to debug.
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