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QUESTION
I would like to know why I am getting a type error when trying to calculate the total length of all characters within each list per given name (key), in the data below using the reduceByKey function.
...ANSWER
Answered 2021-Mar-17 at 21:19The problem in your code is that the reduce function you pass to reduceByKey doesn't produce the same data type as the RDD values. The lambda function returns an int while your values are of type string.
To understand this simply consider how the reduce works. The function is applied to the first 2 values, then the result of the function is added to the third value, and so on...
Note that even the one that worked for you isn't actually correct. For example, it returns ('Danner, Blythe', 'Pear') instead of ('Danner, Blythe', 4).
You should first transform the values into their corresponding length then reduce by key :
QUESTION
I am trying to get a better understanding of the reduceByKey function and have been exploring ways of using it to complete different tasks. I would like to apply the the RDD data shown below. The format for a row of data is a tuple with a name and then a list of all the dates associated to that name (Below is a copy of how the data looks)
...ANSWER
Answered 2021-Mar-08 at 18:43You're looking for a map, not a reduceByKey. There is nothing to reduce, because your data is already grouped by key, so nothing is done on your RDD and you got back the original RDD.
QUESTION
I have two datasets as follows:
...ANSWER
Answered 2020-Dec-08 at 20:20You were on the right track - just a few typos/bugs and you need to finish changing/replacing the column names.
Also, in your first one, you will need to figure out how you want to pick the "best match" based on Municipality.dist, Province.dist, and Year.dist.
Maybe the second one works better if you get the years and provinces sorted out first.
QUESTION
I need to create a list of instantiated objects and loop through the objects of classes(Pet, Jumper, Dog, BigDog, SmallDog, Cat, HouseCat). But these objects are belonged to different classes and have different methods. The main part print the result as expected, but I have no idea to change it to a list of objects and loop through them. Could you please help me? Thanks. My code is as follows(you can ignore the class part, just focus on the main part):
...ANSWER
Answered 2020-Aug-01 at 05:23Perhaps you can make an additional method that in each class that shares the same signature, but has different implementation. Then you can call on that in the for loop.
QUESTION
I am using php recursive function to merge multiple arrays by $test = array_merge((array)$test, $new_sum2); print_r ($test);
Output as below :
...ANSWER
Answered 2020-Mar-01 at 15:50If I'm getting it correctly you can use array_merge function to merge all this arrays into one. As the doc says if the array index are numbers the result array keys will be renumbered with incrementing.
If the input arrays have the same string keys, then the later value for that key will overwrite the previous one. If, however, the arrays contain numeric keys, the later value will not overwrite the original value, but will be appended.
Values in the input arrays with numeric keys will be renumbered with incrementing keys starting from zero in the result array.
Example:
QUESTION
I want to list a lot of arrays from another file,
when I do a "for" to read any array inside.
The code compile do all the list, but when finish the last the code gave me is undefined. How do I fix that?.
I put images from the code. I let you both codes if you want
...ANSWER
Answered 2019-Nov-17 at 07:43Just to clarify your confusion, here is the updated function:-
QUESTION
I am learning java and encounter a doubt. Like in python to access class variable we use self but in java, the same thing is done but without this or self.
...ANSWER
Answered 2019-Nov-10 at 04:03this keyword is optional in java. In this example you can actullay use this keyword also. Only scenario that you will need to use it mandatary is when referring to a field which is named the same both locally and globally.
example:
QUESTION
In the following code, why is 'scotty.constructor' set to 'Dog' function ? How is the constructor property of an object set in general ? Is it set to the function that created the object using 'new' ? If so, scotty was created by 'ShowDog' and the last line should have that as output.
...ANSWER
Answered 2019-Oct-21 at 10:02Employee.prototype = Object.create(Person.prototype);
Employee.prototype.constructor = Employee; //If you don't set Object.prototype.constructor to Employee,
//it will take prototype.constructor of Person (parent).
//To avoid that, we set the prototype.constructor to Employee (child).
QUESTION
I am trying to append the elements in a list ids to a dictionary_la.
So my dictionary_la is generated as,
ANSWER
Answered 2019-Sep-17 at 12:44How about this? You can keep expanding the dictionaries and the list and it'll sure work.
QUESTION
Say I have three dictionaries
...ANSWER
Answered 2019-Sep-17 at 13:58IIUC, you can do:
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