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Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513?
...lStride = numberOfSets * lineSize
Variables spaced criticalStride or a multiple apart contend for the same cache lines.
This is the theory part. Next, the explanation (also Agner, I'm following it closely to avoid making mistakes):
Assume a matrix of 64x64 (remember, the effects vary according ...
Passing data to Master Page in ASP.NET MVC
...tion relevant to it:
public class MasterViewData
{
public ICollection<string> Navigation { get; set; }
}
Each view using that master page takes a strongly typed view data class containing its information and deriving from the master pages view data:
public class IndexViewData : MasterV...
Unable to cast object of type 'System.DBNull' to type 'System.String`
...calar. It does really return null if the field is absent in the return result. So use instead:
return (accountNumber == null) ? string.Empty : accountNumber.ToString()
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Get PHP class property by string
...
Like this
<?php
$prop = 'Name';
echo $obj->$prop;
Or, if you have control over the class, implement the ArrayAccess interface and just do this
echo $obj['Name'];
...
Why are margin/padding percentages in CSS always calculated against width?
...ere offset parent === parent, but still. It's an
odd case that is difficult to resolve.
Update: The last couple sentences may not be entirely accurate. The height of the leaf element (child with no children) has an effect on the height of all elements above it, so this affects many different sit...
How to put comments in Django templates
...
As answer by Miles, {% comment %}...{% endcomment %} is used for multi-line comments, but you can also comment out text on the same line like this:
{# some text #}
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Create module variables in Ruby
...lass variables? I was testing this and I realized I could get the same result from a single @ instance variable. Is there a specific reason for using class variables? Thanks for the reply.
– fabbb
Jan 25 '14 at 2:14
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How to select the rows with maximum values in each group with dplyr? [duplicate]
...
Try this:
result <- df %>%
group_by(A, B) %>%
filter(value == max(value)) %>%
arrange(A,B,C)
Seems to work:
identical(
as.data.frame(result),
ddply(df, .(A, B), function(x) x[which.m...
Viewing all defined variables [duplicate]
.../Info
----------------------------
foo str bar
There are a wealth of other magics available. IPython is basically the Python interpreter on steroids. One convenient magic is store, which lets you save variables between sessions (using pickle).
Note: I am not associated with IPython Dev...
When is -XAllowAmbiguousTypes appropriate?
...ig sym
class SyntacticN f internal | f -> internal
sugarSym :: ( sub :<: AST sup
, ApplySym sig fi sup
, SyntacticN f fi
)
=> sub sig -> f
share :: ( Let :<: sup
, sup ~ Domain b
, sup ~ Domain a
, Syntactic a
...