– Docx equation editor does not automatically italize characters you if are entering with a non-Romanized input method, even if the characters you enter are alphabets.

– Excel .MMULT function requires the two inputs to have the same dimension. You can use it to multiply two 1-dimensional arrays or two 2-dimensional ones, but multiplying a 1D array with a 2D one will fail with an “unable to get the MMult property of the worksheet function class” error. The practical meaning of this is that if one of your input is just a vector, you still need to declare it as a 2D array.

Windows 10終於有內建多重桌面，感覺亦較一致。Start menu其實係縮小版嘅start screen。Cortana暫時無料到。

It has always bewilders me that Windows do not have built-in multi-desktop functionality. Now Windows 10 is finally going to have one.

Overall Windows 10 feel a lot more consistent throughout then Windows 8, which feels like a forced blend between a screen-friendly interface and traditional mouse-based Windows. For example, A lot more settings are now available in the Win8-styled “PC settings”, though the good-old Control Panel is still here. My guess is the latter will be gone in the release version.

Most people have probably faced the problem of not being able to provide good Wi-Fi coverage for every room at home, and this problem is particularly severe in Hong Kong due to the use of concrete walls. In the past one would consider wiring the rooms with Ethernet cables or installing Wi-Fi extenders.  Today I am going to review a third option: powerline network adapters. They work by sending signal through electricity wirings, and units plugged into sockets under the same meter and will automatically form a network. To get internet access, simply connect one of the adapters to your broadband router with an Ethernet cable. Furthermore, there are Wi-Fi-broadcasting models that allow you to extend Wi-Fi coverage.

This hands-on features kits from two Chinese brands: a budget model from Tenda and a mid-range model from TP-Link. Budget models differ from higher-end ones in two major ways: First, budget models usually have maximum theoretically speed of 200Mbps, whereas higher-end ones have speeds up to 600Mbps. Since these numbers are theoretically limits, practical speed will only be a fraction of that, as my test results will show below. Second, high-end models sometimes have a pass-through socket that could be a life-saver if your room is in short of wall sockets.

Test models: Tenda P200/P201 kit (~HK$460) and TP-Link TL-WPA4230P Kit (~HK$650). Each kit comes with one cable-only unit and one Wi-Fi-broadcasting unit.

Test environment: Hong Kong Broadband 100M connection. Test conducted with speedtest.net with a Fujitsu Q584 tablet.

Basic installation: Easy. Both kits work immediately once I plug the included units into wall sockets.

Advanced Installation: you can build a network where devices roam between different Wi-Fi sources depending on their strength by setting the same SSID, encryption mode and password for all Wi-Fi access points on the network. The TP-Link unit has a button for automatically cloning my original Wi-Fi router’s settings via WPS, whereas for the Tenda unit I need to manually change settings via a browser. In practice I have never found WPS particularly easy to use, and it took several tries before the TP-Link unit was able to clone settings successfully. Furthermore, for unknown reasons I could not access the TP-Link’s settings panel the way the manual describe.

Speed: My HKBN connection has an average speed of around 60Mbps. Plugging the powerline units directly into wall sockets, I got the same speed with the TP-Link unit, whereas for the Tenda unit I only got 30Mbps at best. The results were the same regardless of whether I use an Ethernet cable or Wi-Fi, so the bottleneck is the Tenda unit itself. Speed drops dramatically if you plug the units into an extension cord—the average speed was only 3Mbps in my test.

Conclusion: Powerline network adapters present a very convenient way to extend your home network. Base on my test results, I would recommend spending the extra money to get the higher-end models due to the large speed difference.

識電腦硬件都知道，現時固態硬碟（SSD）價格平到一個地步其本上唔值得用普通硬碟開機。但係好多機構係唔明依點，覺得舊電腦慢就買新電腦，要最快嘅CPU最大容量嘅硬碟，偏偏就唔肯花錢買SSD。用唔夠幾耐，部機個普通硬碟用到慢晒，又再花錢買新機，完全係浪費金錢…

Those who are familiar with computer hardware knows that Solid State Drives are so cheap these days, there is really no reason to boot your computer with a traditional hard drive. Many organizations do not understand this point, and keep replace old computers with new ones that pair the newest CPU with a traditional hard drive. All too often, the new computer slows to a crawl and becomes a target for replacement itself.

I encountered this problem today and eventually I realize it was the comment on the line before the mysql dll’s that was causing the problem.

This is what you should have in php.ini by default for PHP 5.5.16:

;extension=php_exif.dll       Must be after mbstring as it depends on it
;extension=php_mysql.dll
;extension=php_mysqli.dll

Besides removing the semi-colons, you also need to delete the line of comment that came after php_exif.dll. This leaves you with

extension=php_exif.dll      
extension=php_mysql.dll
extension=php_mysqli.dll

This solves the problem in my case.

今個星期來得美國開會，當然要試試微軟新出的 Surface Pro 3。簡短的用後感：

– 比 Surface Pro 2輕了 100 克，拿上手明顯感覺得到，算是達至「很輕」的級數。
– 3: 2的比例和 iPad相似，很好用。 12 寸的大小很適合上課或工作用，隨身攜帶則太大了。
– 新的Type Cover很穩固，打字時一點也不會震動。
– 新的數位筆非常、非常的好用：邊位準確度高、筆觸自然流暢。想不到有這樣的一天，但我不得不說，今天N-Trig的筆比 Wacom還好。