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Convert data.frame column format from character to factor
...rs] <- lapply(dat[, character_vars], as.factor)
This creates a vector identifying which columns are of class character, then applies as.factor to those columns.
Sample data:
dat <- data.frame(var1 = c("a", "b"),
var2 = c("hi", "low"),
var3 = c(0, 0.1),
...
Pretty-Print JSON in Java
... Nice answer, more better than using shit like GSON and other side libraries
– Acuna
May 21 at 20:01
...
How to show loading spinner in jQuery?
...o the ajaxStart/Stop events on the element itself.
$('#loadingDiv')
.hide() // Hide it initially
.ajaxStart(function() {
$(this).show();
})
.ajaxStop(function() {
$(this).hide();
})
;
The ajaxStart/Stop functions will fire whenever you do any Ajax calls.
Upda...
How to easily truncate an array with JavaScript?
... edited May 21 '15 at 1:37
David Mason
2,58433 gold badges2626 silver badges3939 bronze badges
answered Jun 4 '09 at 21:04
...
Why is it common to put CSRF prevention tokens in cookies?
...equests where the CSRF value cannot normally persist in the browser).
Consider the following scenarios and processes in a typical application for some pros and cons of each approach you describe. These are based on the Synchronizer Token Pattern.
Request Body Approach
User successfully logs in.
...
Why does Python code run faster in a function?
... (LOAD_GLOBAL), which is a true dict search involving a hash and so on. Incidentally, this is why you need to specify global i if you want it to be global: if you ever assign to a variable inside a scope, the compiler will issue STORE_FASTs for its access unless you tell it not to.
By the way, glob...
Can Android do peer-to-peer ad-hoc networking?
Is it possible to set up Android in ad-hoc peer-to-peer wifi mode? For example, I would like to have one phone broadcast a message, and have all peers in the network receive the broadcast, without having a server. I would like to use wifi since bluetooth range is more limited.
...
Android preferences onclick event
...
Badr,
You need to set android:key for the item, Then in your code you can do...
Assuming you use the following in your XML:
<Preference android:title="About" android:key="myKey"></Preference>
Then you can do the following in your code:...
Using Java with Nvidia GPUs (CUDA)
...and thus like it was well-suited for a GPU, there is another aspect to consider: GPUs are ridiculously fast in terms of theoretical computational power (FLOPS, Floating Point Operations Per Second). But they are often throttled down by the memory bandwidth.
This leads to another classification of p...
How can I change the color of a part of a TextView?
...L string is advisable. And then parsing it via HTML class. Html.fromHtml(R.id.your_html_string);
– sud007
Mar 7 '17 at 11:57
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