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Understanding slice notation
...ared to indexing, Python slicing is bizarrely error-proof:
>>> p[100:200]
[]
>>> p[int(2e99):int(1e99)]
[]
This can come in handy sometimes, but it can also lead to somewhat strange behavior:
>>> p
['P', 'y', 't', 'h', 'o', 'n']
>>> p[int(2e99):int(1e99)] =...
How do I vertically align text in a div?
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not working with percent: height:100%; line-height:100%
– albanx
Jul 2 '15 at 13:41
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CORS Access-Control-Allow-Headers wildcard being ignored?
..."Asia/Jerusalem"
Header set Keep-Alive timeout=100,max=500
Header set Access-Control-Allow-Origin "*"
Header set Access-Control-Allow-Headers "Accept, Accept-CH, Accept-Charset, Accept-Datetime, Accept-Encoding, Accept-Ext, Accept-Features, Accept-Lan...
How to do math in a Django template?
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You can use the add filter:
{{ object.article.rating_score|add:"-100" }}
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How do I measure the execution time of JavaScript code with callbacks?
...sion = 3; // 3 decimal places
var elapsed = process.hrtime(start)[1] / 1000000; // divide by a million to get nano to milli
console.log(process.hrtime(start)[0] + " s, " + elapsed.toFixed(precision) + " ms - " + note); // print message + time
start = process.hrtime(); // reset the timer
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What does O(log n) mean exactly?
...t takes 1 second to compute 10 elements, it will take 2 seconds to compute 100 elements, 3 seconds to compute 1000 elements, and so on.
It is O(log n) when we do divide and conquer type of algorithms e.g binary search. Another example is quick sort where each time we divide the array into two pa...
Get all unique values in a JavaScript array (remove duplicates)
... The option "filter + indexOf" is extremely slow on arrays over 100.000 items. I had to use "object map" approach however it breaks original sorting.
– liberborn
Sep 14 '17 at 13:18
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Overlaying histograms with ggplot2 in R
...'s a concrete example with some output:
dat <- data.frame(xx = c(runif(100,20,50),runif(100,40,80),runif(100,0,30)),yy = rep(letters[1:3],each = 100))
ggplot(dat,aes(x=xx)) +
geom_histogram(data=subset(dat,yy == 'a'),fill = "red", alpha = 0.2) +
geom_histogram(data=subset(dat,yy == 'b'...
Is the “struct hack” technically undefined behavior?
...ch happens to point to an object which can legally be interpreted as char [100]; inside the allocated object.
– R.. GitHub STOP HELPING ICE
Sep 14 '10 at 23:34
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How can I use the $index inside a ng-repeat to enable a class and show a DIV?
...HTML:
{{ selected }}
<ul>
<li ng-class="{current: selected == 100}">
<a href ng:click="setSelected(100)">ABC</a>
</li>
<li ng-class="{current: selected == 101}">
<a href ng:click="setSelected(101)">DEF</a>
</li>
<li ng-cl...