Category: computer science

Computer science: significance of multiple cores

Self-tutoring about computer design: the tutor comments on what “multiple cores” means. As I understand, the benefit of a multi-core processor is that each core can work its own job simultaneously with the others. However many cores there are, that’s

Computer science: what is metadata?

Self-tutoring about comp sci terms: the tutor mentions metadata. Metadata is data about a source of data, such as a file or book. Its metadata includes title, creation date, author (owner), and length. A computer file’s metadata also includes permissions

File systems: fat32 and vfat

Self-tutoring about computer systems: the tutor shares a term. vfat, apparently, is a file system type of which fat32 is a variety.

Computer file types: how long might a pdf be per page?

Self-tutoring about computer file types: the tutor mentions a case. I have a three-page pdf that is 700kB: in this case it’s 233kB per page. It includes images and text.

Programming: Java file runs w/o compiling

Self-tutoring about Java: the tutor mentions an interesting observation. This morning, on this computer, I updated Java to openjdk-13. Having done so, I wrote a small class file to test the installation. On the command line I forgot to compile,

Graphics: aliasing and anti-aliasing

Self-tutoring about graphics: the tutor mentions the concepts of aliasing and anti-aliasing. Aliasing refers to the jagged “stairway” pattern that can develop on a computer-generated curve or oblique line. It can occur when visual units are squares whose edges are

Windows: folder has different name in Windows Explorer vs directory in Command Prompt

Self-tutoring about Windows file system: the tutor mentions a discovery. Today, checking a backup directory, I noticed that, in Windows Explorer, the backup folder for Desktop (desktop_backup) isn’t there. Rather, Desktop is. Yet, in command prompt, Desktop isn’t there, but

Notepad++: using regular expression to search and replace

Self-tutoring about Notepad++: the tutor mentions using regular expressions. Regular expressions can be used in Notepad++ Search and Replace. For instance, suppose you want to change the variable names test2 test39 test991 to test_2 test_39 test_991 . In Notepad++, such

Text editors: Notepad++, part 1: copy current line shortcut

Self-tutoring about computer science apps: the tutor mentions a trick. In my experience, the shortcut to copy current line, Notepad++: Crtl+Shift+X The version of Notepad++ I use is v7.5.9 Source:

Text editors: Notepad++: how to retrieve the cursor

Self-tutoring about Notepad++: the tutor mentions a way to restore the cursor. Once or twice, while using Notepad++, I’ve had the cursor disappear. Last time, I retrieved it by going Settings→Preferences→Editing→Caret Settings, then setting Width to Block. Source: