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Importing data from a JSON file into R
... file into R? More specifically, the file is an array of JSON objects with string fields, objects, and arrays. The RJSON Package isn't very clear on how to deal with this http://cran.r-project.org/web/packages/rjson/rjson.pdf .
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Replace all non-alphanumeric characters in a string
I have a string with which i want to replace any character that isn't a standard character or number such as (a-z or 0-9) with an asterisk. For example, "h^&ell`.,|o w]{+orld" is replaced with "h*ell*o*w*orld". Note that multiple characters such as "^&" get replaced with one asterisk. How would I go...
Remove non-ascii character in string
and i need to remove all non-ascii character from string,
5 Answers
5
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Convert number strings with commas in pandas DataFrame to float
I have a DataFrame that contains numbers as strings with commas for the thousands marker. I need to convert them to floats.
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What is a NullReferenceException, and how do I fix it?
...ess members (such as methods) through a null reference. The simplest case:
string foo = null;
foo.ToUpper();
This will throw a NullReferenceException at the second line because you can't call the instance method ToUpper() on a string reference pointing to null.
Debugging
How do you find the source ...
Find MongoDB records where array field is not empty
...ll of my records have a field called "pictures". This field is an array of strings.
11 Answers
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How do I enumerate through a JObject?
...or JObject, you will see that it implements IEnumerable<KeyValuePair<string, JToken>>. So, you can iterate over it simply using a foreach:
foreach (var x in obj)
{
string name = x.Key;
JToken value = x.Value;
…
}
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How to make an array of arrays in Java
Hypothetically, I have 5 string array objects:
4 Answers
4
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C# Sortable collection which allows duplicate keys
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[TestMethod()]
public void SortTest()
{
TupleList<int, string> list = new TupleList<int, string>();
list.Add(1, "cat");
list.Add(1, "car");
list.Add(2, "dog");
list.Add(2, "door");
list.Add(3, "elephant");
list.Add(1, "coco...
How do you set EditText to only accept numeric values in Android?
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I'm assuming the string should read 0123456789. and not 0123456780.
– audiFanatic
Feb 1 '14 at 1:28
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