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Difference between -pthread and -lpthread while compiling
...-dM test.c > dm.nopthread.txt
$ diff dm.pthread.txt dm.nopthread.txt
152d151
< #define _REENTRANT 1
208d206
< #define __USE_REENTRANT 1
Using the -lpthread option only causes the pthread library to be linked - the pre-defined macros don't get defined.
Bottom line: you should use the -pt...
Ruby on Rails: How do I add a not null constraint to an existing column using a migration?
In my Rails (3.2) app, I have a bunch of tables in my database but I forgot to add a few not null constraints. I've googled around but I can't find how to write a migration which adds not null to an existing column.
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Enum ToString with user friendly strings
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23 Answers
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SVN+SSH, not having to do ssh-add every time? (Mac OS)
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172
First, move your private key file into ~/.ssh. This is not strictly necessary but it's the stan...
How to count TRUE values in a logical vector
...le(z)["TRUE"] # gives you 1
length(z[z == TRUE]) # f3lix answer, gives you 2 (because NA indexing returns values)
So I think the safest is to use na.rm = TRUE:
sum(z, na.rm = TRUE) # best way to count TRUE values
(which gives 1). I think that table solution is less efficient (look at the code o...
converting CSV/XLS to JSON? [closed]
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edited Jan 27 '14 at 12:03
robertc
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JSON Stringify changes time of date because of UTC
My date objects in JavaScript are always represented by UTC +2 because of where I am located. Hence like this
16 Answers
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Convert a Git folder to a submodule retrospectively?
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answered Sep 20 '12 at 15:13
knittlknittl
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Make git automatically remove trailing whitespace before committing
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112
Those settings (core.whitespace and apply.whitespace) are not there to remove trailing whitespac...
Directive isolate scope with ng-repeat scope in AngularJS
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2 Answers
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