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Apply a function to every row of a matrix or a data frame
...pass additional arguments after FUN argument (as Dirk already suggested):
set.seed(1)
m <- matrix(round(runif(20, 1, 5)), ncol=4)
diag(m) <- NA
m
[,1] [,2] [,3] [,4]
[1,] NA 5 2 3
[2,] 2 NA 2 4
[3,] 3 4 NA 5
[4,] 5 4 3 NA
[5,] 2 1 4 ...
Changing CSS Values with Javascript
It's easy to set inline CSS values with javascript. If I want to change the width and I have html like this:
9 Answers
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Get average color of image via Javascript
...ltRGB;
}
height = canvas.height = imgEl.naturalHeight || imgEl.offsetHeight || imgEl.height;
width = canvas.width = imgEl.naturalWidth || imgEl.offsetWidth || imgEl.width;
context.drawImage(imgEl, 0, 0);
try {
data = context.getImageData(0, 0, width, height);
} cat...
How to use Jackson to deserialise an array of objects
...ing documentation indicates that Jackson supports deserialising "Arrays of all supported types" but I can't figure out the exact syntax for this.
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How to modify a pull request on GitHub to change target branch to merge into?
...old PR and referencing in the new one, I don't see value in repeating a subset of steps from an already existing answer. Especially when the list of less steps is harder to read due to lack of proper formatting.
– Lars Blumberg
Mar 26 '16 at 8:48
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Mysql error 1452 - Cannot add or update a child row: a foreign key constraint fails
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UPDATE sourcecodes_tags SET sourcecode_id = NULL WHERE sourcecode_id NOT IN (SELECT id FROM sourcecodes) should help to get rid of those IDs. Or if null is not allowed in sourcecode_id, then remove those rows or add those missing values to the sourc...
Call apply-like function on each row of dataframe with multiple arguments from each row
I have a dataframe with multiple columns. For each row in the dataframe, I want to call a function on the row, and the input of the function is using multiple columns from that row. For example, let's say I have this data and this testFunc which accepts two args:
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Can CSS detect the number of children an element has?
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NOTE: This solution will return the children of sets of certain lengths, not the parent element as you have asked. Hopefully, it's still useful.
Andre Luis came up with a method: http://lea.verou.me/2011/01/styling-children-based-on-their-number-with-css3/ Unfortunately, ...
Is there a 'foreach' function in Python 3?
...tion here} {stuff that runs on each iteration} {commands here...} eg: for {set x 1} {$x <= 10} {incr x} {puts $x} you can also add extra checks inside the iteration braces using ';'. To me would make more sense if he came here asking if python had a true 'for' loop
– Francis...
Scala: Abstract types vs generics
...ct class MaxCell extends AbsCell {
type T <: Ordered { type O = T }
def setMax(x: T) = if (get < x) set(x)
}
Here, the type declaration of T is constrained by an upper type bound which consists of a class name Ordered and a refinement { type O = T }.
The upper bound restricts the specia...