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How do the PHP equality (== double equals) and identity (=== triple equals) comparison operators dif
...ways have to look at the context to see what, where and why something gets converted to understand what is going on.
Converting rules
Converting to boolean
Converting to integer
Converting to float
Converting to string
Converting to array
Converting to object
Converting to resource
Converting to ...
Append an object to a list in R in amortized constant time, O(1)?
...ctures, they supports O(1) (amortized) appends, and allow the result to be converted back to a plain list.
expandingList <- function(capacity = 10) {
buffer <- vector('list', capacity)
length <- 0
methods <- list()
methods$double.size <- function() {
buffer...
Python try-else
... if the try clause does not raise an exception. For
example:
for arg in sys.argv[1:]:
try:
f = open(arg, 'r')
except IOError:
print 'cannot open', arg
else:
print arg, 'has', len(f.readlines()), 'lines'
f.close()
The use of the else clause is bett...
Converting an object to a string
How can I convert a JavaScript object into a string?
36 Answers
36
...
Convert column classes in data.table
I have a problem using data.table: How do I convert column classes? Here is a simple example: With data.frame I don't have a problem converting it, with data.table I just don't know how:
...
Convert a list to a data frame
...gth is 132 and each item is a list of length 20. Is there a quick way to convert this structure into a data frame that has 132 rows and 20 columns of data?
...
App Inventor 2 数学代码块 · App Inventor 2 中文网
...(acos)
反正切 (atan)
反正切2 (atan2)
将弧度转换为度数 (convert radians to degrees)
将度数转换为弧度 (convert degrees to radians)
数字转变为小数形式 (format as a decimal)
是否为数字 (is a number)
进制转换 (convert number)
按位与 (bitwise and)...
Convert string with commas to array
How can I convert a string to a JavaScript array?
18 Answers
18
...
Convert Unicode to ASCII without errors in Python
My code just scrapes a web page, then converts it to Unicode.
11 Answers
11
...
Do I need to convert .CER to .CRT for Apache SSL certificates? If so, how?
...erent ways. Most systems accept both formats, but, if you need to, you can convert one to the other via openssl or other tools. The encoding within a certificate file is really independent of which extension somebody gave the file.
...