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Iterate keys in a C++ map
Is there a way to iterate over the keys, not the pairs of a C++ map?
19 Answers
19
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GroupBy pandas DataFrame and select most common value
I have a data frame with three string columns. I know that the only one value in the 3rd column is valid for every combination of the first two. To clean the data I have to group by data frame by first two columns and select most common value of the third column for each combination.
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how does multiplication differ for NumPy Matrix vs Array classes?
The numpy docs recommend using array instead of matrix for working with matrices. However, unlike octave (which I was using till recently), * doesn't perform matrix multiplication, you need to use the function matrixmultipy(). I feel this makes the code very unreadable.
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How to capture the browser window close event?
...to capture the browser window/tab close event.
I have tried the following with jQuery:
17 Answers
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MySQL ON vs USING?
...can tell, USING() is just more convenient syntax, whereas ON allows a little more flexibility when the column names are not identical. However, that difference is so minor, you'd think they'd just do away with USING() .
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Importing modules from parent folder
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It seems that the problem is not related to the module being in a parent directory or anything like that.
You need to add the directory that contains ptdraft to PYTHONPATH
You said that import nib worked with you, that prob...
Simplest way to read json from a URL in java
... Maven artifact org.json:json I got the following code, which I think is quite short. Not as short as possible, but still usable.
package so4308554;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
impor...
Error: Could not create the Java Virtual Machine Mac OSX Mavericks
...hen you invoke java by supplying the wrong arguments/options. In this case it should be the version option.
java -version
So to double check you can always do java -help, and see if the option exists. In this case, there is no option such as v.
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Reloading submodules in IPython
...Ipython is used as interactive console. Unfortunately I am not very happy with workflow that I am using right now, I would appreciate some advice.
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How to exclude a module from a Maven reactor build?
We have a Maven 2 project with lots of modules in it. Example:
7 Answers
7
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