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How can I plot with 2 different y-axes?

I would like superimpose two scatter plots in R so that each set of points has its own (different) y-axis (i.e., in positions 2 and 4 on the figure) but the points appear superimposed on the same figure. ...
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What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it?

What does ArrayIndexOutOfBoundsException mean and how do I get rid of it? 25 Answers ...
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Remote JMX connection

I'm trying to open a JMX connection to java application running on a remote machine. 12 Answers ...
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Accessing class variables from a list comprehension in the class definition

How do you access other class variables from a list comprehension within the class definition? The following works in Python 2 but fails in Python 3: ...
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UIView Hide/Show with animation

My simple goal is to fade animate hiding and showing functions. 21 Answers 21 ...
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Pandas every nth row

Dataframe.resample() works only with timeseries data. I cannot find a way of getting every nth row from non-timeseries data. What is the best method? ...
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Sort array of objects by single key with date value

I have an array of objects with several key value pairs, and I need to sort them based on 'updated_at': 19 Answers ...
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What is :: (double colon) in Python when subscripting sequences?

I know that I can use something like string[3:4] to get a substring in Python, but what does the 3 mean in somesequence[::3] ? ...
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Any shortcut to initialize all array elements to zero?

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Representing and solving a maze given an image

What is the best way to represent and solve a maze given an image? 10 Answers 10 ...