In the MacOS system, the keychain password has to match the user password in order to use keychain appropriately. In my case, they have to match in order to allow Apple Watch to unlock the Mac.
The official way to change the keychain password can be found HERE. However, in my case, the "Change password for keychain login" option is in gray and can not be selected. One solution is the following:
Open terminal and type in
security set-keychain-password
Then, type in old password and then new password. The password is then changed. This does not require admin access.
Linearly independency for exponential functions
Written by Changhui TanThis is a supplementary notes for MATH211 ODE and Linear Algebra.
Display the part of the graph beyond the axis limit in Matlab
Written by Changhui TanWhen I tried to manually adjust the axis limits of a graph, Matlab will automatically cut off the part of the graph that is beyond the axis limits. This didn't happen before (and before means 2014a or earlier versions). I took a little while to find the cure. Just try the following scripts.
ax = gca;
ax.Clipping = 'off';
Here is the steps to change default mail app in OS X:
- Open Mail app.
- Select Preferences -> General. Under "Default email reader", select your preferred mail app.
I am running into a problem by following the steps: the default email reader changes back to the original mail app seconds after I made the change. Here is the solution that works for me. Open terminal. Copy and paste the following script.
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -kill -r -all local,system,user
Then try step 1-2 again, and it won't change back again!
The purpose of this note is to clarify questions and statements in class, and to provide detailed procedures to find polynomial interpolations.