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Combine two data frames by rows (rbind) when they have different sets of columns
...d do the following.
# put data.frames into list (dfs named df1, df2, df3, etc)
mydflist <- mget(ls(pattern="df\\d+"))
# get all variable names
allNms <- unique(unlist(lapply(mydflist, names)))
# put em all together
do.call(rbind,
lapply(mydflist,
function(x) data.frame...
Automatically capture output of last command into a variable using Bash?
...am the program uses (be it stdin or stderr), the printing method (ncurses, etc.) and the program's exit code - the data just needs to be displayed.
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Confusion between numpy, scipy, matplotlib and pylab
...b = pyplot + numpy
See more information here: Matplotlib, Pylab, Pyplot, etc: What's the difference between these and when to use each?
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Static nested class in Java, why?
...images used for project), values folder (which contains string constants), etc..
Sine all the folders are part of Res folder, android tool generates a R.java (resources) file which internally contains lot of static nested classes for each of their inner folders.
Here is the look and feel of R.java...
What is the difference between Builder Design pattern and Factory Design pattern?
...name) { this.name = name; return this; }
FruitBuilder setColor(color) { this.color = color; return this; }
FruitBuilder setFirmness(firmness) { this.firmness = firmness; return this; }
Fruit build() {
return new Fruit(this); // Pass in the builder
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What's a good way to overwrite DateTime.Now during testing?
...ppropriately according to the concern of the code, e.g business logic, UI, etc. DateTime manipulation across timezones is a minefield but the best first foot forward is to always start with UTC time.
– Adam Ralph
Nov 15 '13 at 15:33
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In Bash, how can I check if a string begins with some value?
...sting function calls with strings is not possible, pipes are not possible, etc.)
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Can I use twitter bootstrap without jquery?
...strap but you'd have to avoid using collapsible menus, alert/dialog boxes, etc. and strip them out of the example pages if you use them as templates.
– tagawa
Nov 26 '14 at 2:55
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How to configure XAMPP to send mail from localhost?
...mpp\php\php.ini refers to windows environments. For mac look in xamppfiles/etc for your php.ini file.
– Paul Trotter
Oct 14 '14 at 10:46
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.NET Configuration (app.config/web.config/settings.settings)
...oyer solved this issue by first putting the dev level (debug, stage, live, etc) in the machine.config file. Then they wrote code to pick that up and use the right config file. That solved the issue with the wrong connection string after the app gets deployed.
They just recently wrote a central webs...