How does one, in Maple, prompt the user to answer a true or false (or yes or no) question that can be evaluated by your program like how a boolean would be in java? The exact question would be "is the equation you want to use x=f(Xo)". This is in an if statement already so if true then continue with the program and if false then prompt the user to input the equation that they want to use.
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Can anybody explain the difference between IfWinActive and If WinActive()? I'm really wondering, but Google and official AutoHotkey docs says nothing about.
If IfWinActive evaluates to True, the next line of code (or brace-bracketed code block) is performed, or if False, it is skipped. All it does is evaluate to True or False.
The function WinActive() returns the Unique ID (HWND) of the active window if it matches the specified criteria. If it does not, the function returns 0. Since all non-zero numbers are seen as "true", the statement If WinActive("WinTitle") is true whenever "WinTitle" is active, and then acts just like IfWinActive WinTitle. Note the quotes in the function, but not the directive.
I want to make my LED blink when I click Yes on my two button dialog. I had referred many other vi to do the similar process using "Select" function. But I have no idea why my "s" terminal won't become true when I click Yes in my case structure.
My vi:
It goes true when you press "yes" But in next iteration executes false state of the first call case and it becomes false after second iteration. Put shift register to remember your "yes" decision after 1st iteration. Also have a look on my comments: https://www.dropbox.com/s/pwx9fv1v70b9ttb/RnhZN.png?dl=0
I'd like to use a function in some matlab scripts that would do the following:
Pause until user hits any single key
Return the key stroke hit by the user
The pause function doesn't work, because it doesn't return the user keystroke. The input function doesn't work, because it requires the "enter" key to be hit. The keyboard command dumps you into the full command line window which I don't want (although might be useful for future work). Note, there are ways to do this from figures, i.e. if a figure has focus, you can sniff keystrokes using the 'KeyPressFcn' handler. But I want to do this from scripts. Worst case, I can use the input command, but was hoping for something that required fewer keystrokes from the user.
I found this on MathWorks. Does it do what you want: http://www.mathworks.com/matlabcentral/fileexchange/7465-getkey
I need to check validity of an expression and if it was true then check 2nd exp.
It can be written in 2 if-end structures but I want to put condition in conditional breakpoint, and I think it is not possible to write 2 if in one line.
But AndAlso can solve my problem.
any idea?
If you use the shortcut AND, i.e. &&, the second statement is only evaluated if the first one was true. Thus, something like
i>1 && foo(i)==3
should do the trick.
For instance, global-linum-mode 1 enables line numbers global-linum-mode 0 disables line numbers, what global-linum-mode t would do? and I've seen another parameter: nil. What do they do?
t and nil in boolean context are the (Emacs) Lisp truth values. nil is false. Any non-nil value is considered to be true, but t is customarily used. Source.
As for global-linum-mode, any non-negative parameter will enable it, including t, "foo",... etcetera.
For such questions it is very useful to play in the scratch buffer with elisp: type your expression there and press C-j.
t is true, nil is false.