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Check if an apt-get package is installed and then install it if it's not on Linux
... is available
The documentations are also very unclear, e.g.:
sudo apt dselect-upgrade
did not remove certbot when it was marked as deinstall, even though man apt-get seems to indicate that:
dselect-upgrade is used in conjunction with the traditional Debian packaging front-end, dselect(1). ...
Append column to pandas dataframe
...efore you join() or concat() if you trying to deal with some data frame by selecting some rows from another DataFrame.
One example below shows some interesting behavior of join and concat:
dat1 = pd.DataFrame({'dat1': range(4)})
dat2 = pd.DataFrame({'dat2': range(4,8)})
dat1.index = [1,3,5,7]
dat...
Explain the use of a bit vector for determining if all characters are unique
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@Ivan Man, I was thinking the same thing. Even the selected answer didn't explain about the operators. Thank you for the detailed info.
– WowBow
Jan 6 '15 at 20:11
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How can I discard remote changes and mark a file as “resolved”?
.... is important; passing in a file name (in this case, the whole directory) selects between two different modes of operation of checkout, one which switches branches and one which moves files from the index to the working copy. I agree, it's very confusing. You could also do git checkout --ours -- &l...
How do I make a fully statically linked .exe with Visual Studio Express 2005?
...e configurations, you should make them to "All Configurations" --- you can select this at the top of the Properties window. If you make the change to just the Debug configuration, it won't apply to the Release configuration, and vice-versa.
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C# Convert List to Dictionary
...other way to deal with duplicate is you can do like this
var dic = slist.Select((element, index)=> new{element,index} )
.ToDictionary(ele=>ele.index.ToString(), ele=>ele.element);
or
easy way to do is
var res = list.ToDictionary(str => str, str=> str);
but mak...
Is a LINQ statement faster than a 'foreach' loop?
...ter than a flat foreach, but most likely you wouldn't have done a blanket "select * from foo" anyway, so that isn't necessarily a fair comparison.
Re PLINQ; parallelism may reduce the elapsed time, but the total CPU time will usually increase a little due to the overheads of thread management etc.
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What's the point of the X-Requested-With header?
... are already loaded. So you can use an AJAX to get the recipe the user has selected but to save time and bandwidth don't load the header/footer/ads.
Now you can just write a secondary endpoint for the data like www.example.com/recipe_only/apple_pie but that's harder to maintain and share to other ...
How to save a plot as image on the disk?
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How do I do this when R asks for a "Selection"? For example If I use m3=garchFit(~arma(3,0)+garch(1,1)) and plot(m3).
– jacob
Jan 25 '16 at 13:28
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How do you make a WPF slider snap only to discrete integer positions?
...0, 20, ...) but all the values in-between (1, 2, ...) are valid and can be selected with e.g. arrow keys.
– mkjeldsen
Feb 20 '13 at 6:45
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