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How to succinctly write a formula with many variables from a data frame?
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A slightly different approach is to create your formula from a string. In the formula help page you will find the following example :
## Create a formula for a model with a large number of variables:
xnam <- paste("x", 1:25, sep="")
fmla <- as.formula(paste("y ~ ", paste(xnam, col...
jQuery 'input' event
...trary could be surmised from rereading (i.e. from a reference to different string identifiers between Level 0 and Level 2 models). That is quite misleading.
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How to hide first section header in UITableView (grouped style)
...{
if (section == 0)
return 1.0f;
return 32.0f;
}
- (NSString*) tableView:(UITableView *) tableView titleForHeaderInSection:(NSInteger)section
{
if (section == 0) {
return nil;
} else {
// return some string here ...
}
}
- (void) viewDidLoad
{
[su...
Altering column size in SQL Server
...u can cause a crash (on my environment anyway).
– DavidTheDev
Jan 30 '15 at 15:36
57
It's also im...
Will console.log reduce JavaScript execution performance?
...ed) logging-off x 56,058,330 ops/sec ±2.87% (56 runs sampled) logging-off-stringify x 1,812,379 ops/sec ±3.50% (58 runs sampled) log-nothing x 59,509,998 ops/sec ±2.63% (59 runs sampled)
– casey
Apr 6 '16 at 23:27
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Error: No default engine was specified and no extension was provided
...gine require() cache
* - `root` root path for view lookup
*
* @param {String} name
* @param {Object} options
* @api private
*/
function View(name, options) {
options = options || {};
this.name = name;
this.root = options.root;
var engines = options.engines;
this.defaultEngine = op...
What is `related_name` used for in Django?
...nstance). The formula Django uses is the name of the model followed by the
string _set. The related name parameter thus simply overrides Django’s default rather
than providing new behavior.
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PHPDoc type hinting for array of objects?
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Would be nice to have @var Obj[string] for associative arrays.
– donquixote
Dec 2 '13 at 5:33
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How to add 30 minutes to a JavaScript Date object?
...unction() { if(ret.getDate() != date.getDate()) ret.setDate(0);};
switch(String(interval).toLowerCase()) {
case 'year' : ret.setFullYear(ret.getFullYear() + units); checkRollover(); break;
case 'quarter': ret.setMonth(ret.getMonth() + 3*units); checkRollover(); break;
case 'month...
微博为什么限制140字(附短信70字限制考) - 闲聊区 - 清泛IT社区，为创新赋能！
...更新状态的字数限制，本身是160字母的限制，再留20字给id长度，剩余140字母留给用户发挥。此外，YAHOO!的meme（2,000字）和Google的Buzz（没有限制）等对字数都没有短而精的要求，在这个层面上，算不上微博，只能算轻量级博客，...