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Drawing an image from a data URL to a canvas
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@Phrogz it gives me an error: var ctx = myCanvas.getContext('2d'); just copy/past your code to test
– Jepser Bernardino
Aug 17 '11 at 22:29
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Determine if running on a rooted device
...han having this feature fail when it is used (and then show an appropriate error message to the user), I'd prefer an ability to silently check if root is available first, and if not,hide the respective options in the first place.
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datetime dtypes in pandas read_csv
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I was having error as I was passing single string name of column, now I understand that I needed to pass list for a single value also.
– TapanHP
Jul 12 '19 at 10:40
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Add a new element to an array without specifying the index in Bash
... syntax could be applied to arrays too; the rules, determined by trial and error, are (bash 3.2.48): ${array[@]: start[:count]} Returns count elems. or, if not specified, all remaining elems. starting at the following elem.: - If start >= 0: from the elem. whose index is >= start. - If start &...
What does “static” mean in C?
...t;
/*
Undefined behavior: already defined in main.
Binutils 2.24 gives an error and refuses to link.
https://stackoverflow.com/questions/27667277/why-does-borland-compile-with-multiple-definitions-of-same-object-in-different-c
*/
/*int i = 0;*/
/* Works in GCC as an extension: https://stackoverflo...
What does “not run” mean in R help pages?
...urpose of illustration, it’s often useful to include code that causes an error. \dontrun{} allows you to include code in the example that is never used. There are two other special commands. \dontshow{} is run, but not shown in the help page: this can be useful for informal tests. \donttest{} is r...
“Uncaught TypeError: Illegal invocation” in Chrome
... I've just copy-pasted your code and get the Illegal invocation error. Here's the screencast.
– Dan Dascalescu
Mar 10 '14 at 3:22
24
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Does a valid XML file require an XML declaration?
...ML format that is missing information without its DTD.
Update:
A "prolog error/invalid utf-8 encoding" error indicates that the actual data the parser found inside the file did not match the encoding that the XML declaration says it is. Or in some cases the data inside the file did not match the a...
Why does this loop produce “warning: iteration 3u invokes undefined behavior” and output more than 4
...in seeing this code:
struct foo *s = ...;
int x = s->f;
if (!s) return ERROR;
gcc inferred that since s was deferenced in s->f; and since dereferencing a null pointer is undefined behavior then s must not be null and therefore optimizes away the if (!s) check on the next line.
The lesson ...
Check if a variable is a string in JavaScript
...vides "defensiveness" against issues that will blow up your js app. Fatal errors happen when you attempt to do string operations on an object (or vice versa), and Lodash provides tremendous value around preventing those errors.
– random_user_name
Oct 17 '17 at...