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Call apply-like function on each row of dataframe with multiple arguments from each row
... a subset of the original data.
dat <- data.frame(x=c(1,2), y=c(3,4), z=c(5,6))
apply(dat[,c('x','z')], 1, function(x) sum(x) )
or if your function is just sum use the vectorized version:
rowSums(dat[,c('x','z')])
[1] 6 8
If you want to use testFunc
testFunc <- function(a, b) a + b
...
MFC 的SetWindowPos 用法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...窗口的x和y坐标、宽和高度。hWndInsertAfter用来指定窗口的Z位置（或称Z顺序）。如果你经常接触3D方面的软件，你就知道Z代表深度。这个参数接受5种值：HWND_BOTTOM、 HWND_NOTOPMOST、HWND_TOP、HWND_TOPMOST或者另一个窗口的句柄。而wFlags用...
Is it possible to set the stacking order of pseudo-elements below their parent element? [duplicate]
... stacking order.
Positioning the pseudo-element (absolute) and assigning a z-index value other than “auto” creates the new stacking context.
#element {
position: relative; /* optional */
width: 100px;
height: 100px;
background-color: blue;
}
#element::after {
...
Multiple modals overlay
...orter solution that is inspired by @YermoLamers & @Ketwaroo.
Backdrop z-index fix
This solution uses a setTimeout because the .modal-backdrop isn't created when the event show.bs.modal is triggered.
$(document).on('show.bs.modal', '.modal', function () {
var zIndex = 1040 + (10 * $('.modal...
How to use glOrtho() in OpenGL?
...that you see in the bottom row. No matter how far away vertexes are in the z direction, they will not recede into the distance.
I use glOrtho every time I need to do 2D graphics in OpenGL (such as health bars, menus etc)
using the following code every time the window is resized:
glMatrixMode(GL_PR...
bootstrap popover not showing on top of all elements
...
Vaidas
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answered Apr 12 '13 at 22:37
KyleKyle
26.6k3131 gold badges111111 si...
date format yyyy-MM-ddTHH:mm:ssZ
...sume this should be pretty simple, but could not get it :(.
In this format Z is time zone.
T is long time pattern
How could I get a date in this format except by using
...
Test for non-zero length string in Bash: [ -n “$var” ] or [ “$var” ]
I've seen Bash scripts test for a non-zero length string in two different ways. Most scripts use the -n option:
6 Answers...
Illegal pattern character 'T' when parsing a date string to java.util.Date
... 8 and higher
You can now simply do Instant.parse("2015-04-28T14:23:38.521Z") and get the correct thing now, especially since you should be using Instant instead of the broken java.util.Date with the most recent versions of Java.
You should be using DateTimeFormatter instead of SimpleDateFormatte...
What is the difference between currying and partial application?
...with a single argument each. Given the following function:
function f(x,y,z) { z(x(y));}
When curried, becomes:
function f(x) { lambda(y) { lambda(z) { z(x(y)); } } }
In order to get the full application of f(x,y,z), you need to do this:
f(x)(y)(z);
Many functional languages let you write f...