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psycopg2: insert multiple rows with one query
I need to insert multiple rows with one query (number of rows is not constant), so I need to execute query like this one:
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CALayer with transparent hole in it
...le view (left side of the picture) and i need to create some kind of overlay (right side of the picture) to this view. This overlay should have some opacity, so the view bellow it is still partly visible.
Most importantly this overlay should have a circular hole in the middle of it so it doesn't ove...
How do I parse command line arguments in Bash?
Say, I have a script that gets called with this line:
37 Answers
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Setting individual axis limits with facet_wrap and scales = “free” in ggplot2
I'm creating a facetted plot to view predicted vs. actual values side by side with a plot of predicted value vs. residuals. I'll be using shiny to help explore the results of modeling efforts using different training parameters. I train the model with 85% of the data, test on the remaining 15%, a...
Is it possible to define more than one function per file in MATLAB, and access them from outside tha
When I was studying for my undergraduate degree in EE, MATLAB required each function to be defined in its own file, even if it was a one-liner.
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Is gcc's __attribute__((packed)) / #pragma pack unsafe?
In C, the compiler will lay out members of a struct in the order in which they're declared, with possible padding bytes inserted between members, or after the last member, to ensure that each member is aligned properly.
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How to get a vertical geom_vline to an x-axis of class date?
Even though I found Hadley's post in the google group on POSIXct and geom_vline , I could not get it done. I have a time series from and would like to draw a vertical line for years 1998, 2005 and 2010 for example. I tried with ggplot and qplot syntax, but still I either see no vertical line ...
Is there a regular expression to detect a valid regular expression?
... # end of string
/
This is a recursive regex, and is not supported by many regex engines. PCRE based ones should support it.
Without whitespace and comments:
/^((?:(?:[^?+*{}()[\]\\|]+|\\.|\[(?:\^?\\.|\^[^\\]|[^\\^])(?:[^\]\\]+|\\.)*\]|\((?:\?[:=!]|\?<[=!]|\?>)?(?1)??\)|\(\?(?:R|[+-]?...
What are the mathematical/computational principles behind this game?
My kids have this fun game called Spot It! The game constraints (as best I can describe) are:
9 Answers
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Initialising an array of fixed size in python [duplicate]
I would like to know how i can initialise an array(or list), yet to be populated with values, to have a defined size.
11 An...