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Use of ~ (tilde) in R programming Language
... common uses of formula objects in R
The lattice package uses them to specify the variables to plot.
The ggplot2 package uses them to specify panels for plotting.
The dplyr package uses them for non-standard evaulation.
sha...
MySQL Insert Where query
...as it stands will fail. Assuming your id column is unique or primary key:
If you're trying to insert a new row with ID 1 you should be using:
INSERT INTO Users(id, weight, desiredWeight) VALUES(1, 160, 145);
If you're trying to change the weight/desiredWeight values for an existing row with ID 1...
git diff two files on same branch, same commit
sorry if this question exists, I surprisingly could not find it :/
6 Answers
6
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How to prevent rm from reporting that a file was not found?
...valent). You can check the value of $?
immediately after calling rm to see if a file was actually removed or not.
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PHP equivalent of .NET/Java's toString()
... @Supuhstar Ah right, I finally understand where you're coming from. Sorry if I was being obtuse before. I agree that this is a relevant detail and it would be valuable to add it, perhaps separating the answer into 'Converting Primitives' and 'Converting Objects' sections with headers.
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Why is “a” != “a” in C?
...
What you are comparing are the two memory addresses for the different strings, which are stored in different locations. Doing so essentially looks like this:
if(0x00403064 == 0x002D316A) // Two memory locations
{
printf("Yes, equal");
}
Use the following code to compare two stri...
Get all column names of a DataTable into string array using (LINQ/Predicate)
...
List<String> lsColumns = new List<string>();
if(dt.Rows.Count>0)
{
var count = dt.Rows[0].Table.Columns.Count;
for (int i = 0; i < count;i++ )
{
lsColumns.Add(Convert.ToString(dt.Rows[0][i]));
}
}
...
Large Numbers in Java
...guess) inherit performance hit incurred by the use of the BigInteger class if you plan to do calculations with that.
– haylem
Feb 29 '12 at 0:43
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How to set selected value on select using selectpicker plugin from bootstrap
... plugin hide the real select and show a button with an unordered list, so, if you want that the user see the selected value on the select you can do something like this:
//Get the text using the value of select
var text = $("select[name=selValue] option[value='1']").text();
//We need to show the te...
How to print the contents of RDD?
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If you want to view the content of a RDD, one way is to use collect():
myRDD.collect().foreach(println)
That's not a good idea, though, when the RDD has billions of lines. Use take() to take just a few to print out:
myRDD...