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How to add new item to hash
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307
Create the hash:
hash = {:item1 => 1}
Add a new item to it:
hash[:item2] = 2
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What does the exclamation mark mean in a Haskell declaration?
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3 Answers
3
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Move entire line up and down in Vim
...work.
– Lari Hotari
Sep 6 '12 at 6:43
2
If somebody wants a different shortcut: c is for control,...
Python Matplotlib Y-Axis ticks on Right Side of Plot
...f = plt.figure()
ax = f.add_subplot(111)
ax.yaxis.tick_right()
plt.plot([2,3,4,5])
plt.show()
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@RequestParam vs @PathVariable
...e URI (Spring call it an URI Template)
— see Spring Reference Chapter 16.3.2.2 URI Template Patterns
@RequestParam is to obtain a parameter from the URI as well — see Spring Reference Chapter 16.3.3.3 Binding request parameters to method parameters with @RequestParam
If the URL http://localhos...
Convert array to JSON
I have an Array var cars = [2,3,..] which holds a few integers.
I've added a few values to the array, but I now need to send this array to a page via jQuery's .get method. How can I convert it to a JSON object for sending?
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How to read and write excel file
I want to read and write an Excel file from Java with 3 columns and N rows, printing one string in each cell. Can anyone give me simple code snippet for this? Do I need to use any external lib or does Java have built-in support for it?
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Python super() raises TypeError
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132
The reason is that super() only operates on new-style classes, which in the 2.x series means ex...
What is tail call optimization?
...result after the call returns. As such, the stack looks as follows:
(fact 3)
(* 3 (fact 2))
(* 3 (* 2 (fact 1)))
(* 3 (* 2 (* 1 (fact 0))))
(* 3 (* 2 (* 1 1)))
(* 3 (* 2 1))
(* 3 2)
6
In contrast, the stack trace for the tail recursive factorial looks as follows:
(fact 3)
(fact-tail 3 1)
(fact-t...
promise already under evaluation: recursive default argument reference or earlier problems?
...instances where they occur we get:
f <- function(x, T) {
10 * sin(0.3 * x) * sin(1.3 * x^2) + 0.001 * x^3 + 0.2 * x + 80
}
g <- function(x, T, f. = f) { ## 1. note f.
exp(-f.(x)/T)
}
test<- function(g. = g, T = 1) { ## 2. note g.
g.(1,T)
}
test()
## [1] 8.560335e-37
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