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rgdal package installation
...file update
Then, when you get an error such as :
configure: error: proj_api.h not found in standard or given locations.
You can use the following command to find which package you must install to get the missing file :
$ apt-file search proj_api.h
libproj-dev: /usr/include/proj_api.h
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How to save an image locally using Python whose URL address I already know?
...wered Nov 27 '11 at 15:01
Liquid_FireLiquid_Fire
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What is the purpose of the word 'self'?
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But in __init__(self) method, it accepts self, then even without creating the object, how does it refer to itself?
– saurav
Jan 28 '18 at 10:10
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What and where are the stack and heap?
...ion is called. The stack is always reserved in a LIFO (last in first out) order; the most recently reserved block is always the next block to be freed. This makes it really simple to keep track of the stack; freeing a block from the stack is nothing more than adjusting one pointer.
The heap is me...
Const before or const after?
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The order of the keywords in a declaration isn't all that fixed. There are many alternatives to "the one true order". Like this
int long const long unsigned volatile i = 0;
or should it be
volatile unsigned long long int con...
Can you grab or delete between parentheses in vi/vim?
... | |
\_______\___---> Cursor range
assuming that your cursor is inside the above mentioned cursor range, you can issue the following commands :
di( --> Deletes '5.0/9.0'
ci( --> Substitutes '5.0/9.0'
yi( --> Y...
javac : command not found
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yes, i am sure. just look at the java-1.6.0-openjdk.x86_64 package information (scroll to the "Files" section) and see that there is no javac in that package. and then look at the OpenJDK Development Environment package.
– ax.
Mar 23 '11 at ...
Understanding scala enumerations
...s. It is useful, because after you import it elsewhere with import WeekDay._, you can use that type, e.g.:
def isWorkingDay(d: WeekDay) = ! (d == Sat || d == Sun)
Instead, a minimal version would just be:
object WeekDay extends Enumeration {
val Mon, Tue, Wed, Thu, Fri, Sat, Sun = Value
}
an...
Rails Root directory path?
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which returns a Pathname object. If you want a string you have to add .to_s. If you want another path in your Rails app, you can use join like this:
Rails.root.join('app', 'assets', 'images', 'logo.png')
In Rails 2 you can use the RAILS_ROOT constant, which is a string.
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Days between two dates? [duplicate]
...est for calendar checks.
from datetime import timedelta, datetime
def cal_days_diff(a,b):
A = a.replace(hour = 0, minute = 0, second = 0, microsecond = 0)
B = b.replace(hour = 0, minute = 0, second = 0, microsecond = 0)
return (A - B).days
if __name__ == '__main__':
x = datetime...