The other day, I was invited to a zoom meeting. Zoom is a video conference application also available for computers. It’s address is https://zoom.us. When the time of our meeting came, I couldn’t hear anything when connecting from my Firefox browser, and saw the following message: . After a short IRC conversation on #freebsd@freenode.org, I …
Having upgraded my FreeBSD system and VirtualBox, I found that VirtualBox does not work when invoked from the window manager’s menu. So, I tried running it from the command line, and got the following message: /usr/local/lib/virtualbox/VirtualBox.so: Undefined symbol “_ZNK6QColor6darkerEi@Qt_5” I tried to search the web for the cause, and found a link to a compatibility …
Matplotlib is a great python library for plotting and graphics. Graphics include formatted text, text paths and tabular data. Mathematical expressions are a good reason to use Matplotlib for rendering text. Matplotlib also supports some widgets one can use for input. If you use Matplotlib widgets, you vetter know how to size and position them …
I recently installed VirtualBox configured internet connection to the internet for a virtual windows 7 machine I’ve installed using Vagrant, tried to setup USB, but got the following message: “Failed to save settings – Empty or null HostOnly interface name is not valid.”. Looking at the details, I saw the following “Result Code: E_FAIL (0x80004005) …
HTML5 includes some features that allows developers to draw 3D shapes by drawing bi dimensional shapes and applying 3d transform, such as rotateX, rotateY and rotateZ. For convenience, you can shift the origin of axes using the style property If you don’t want the 3D image too flat (for example, all the faces of a …
Some days ago I found that someone was looking for a D3.js expert. To prove one is an expert one has to pass a test, and one of the tasks on this test is to create a 3D color picker with RGB for axes. The cube faces cannot be filled with a bi-dimensional linear gradients …
The thought to create a copy of my Thunderbird profile did not cross my mind until the last power failure. After each power failure I found that I have to setup my mail account, and that all my events were “lost”. Wellm the events were not exactly lost, but a new calendar id was created, …
Matplotlib is a MATLAB-like library that allows Python programmers to create images and animations. For example, you can easily draw a graphic representation of functions with Y (and maybe Z) values generated by numpy and scipy functions. Matplotlib can also be interactive and handle events. The command mpl_connect is used for connecting an event with …
The other day I downloaded “Fahrenheit 451” by Ray Bradbury as a free eBook, and tried to read it. I found that I cannot read much more than the titles of each chapter. I tried double-clicking and dragging, and saw that something appears on the screen, organized in paragraphs. Right Click->Inspect Element Now, a sub-window …
Before you upload an internet site, you better test it on your local machine. To do that, you should allocate an IP address known as a loopback address that does not require a modem for access. If you’ve installed Apache Httpd server, you’ll probably get an HTML page that reads “It works” upon connecting to …
