I like how (2*∘÷⍨+/÷≢)(×⍨⊢-+/÷≢) tells me exactly what standard deviation is, from the ground up, without using one-off special symbols or extra explanation like "where n is the number of items". Also it's very clear that you're taking the mean twice.
The no parens version feels a bit weird because when you're taking the mean of the squares of differences, you're dividing by the original number of items instead of the number of squares of differences, but they're the same of course
In a TabControl, when the form displays, the most recently created tabbutton + form is displayed, instead how can I have it so that the first one displays?
@rak1507 Try quadNQing a GotFocus or Select event on the tab button or the associated sub form. I don't have code in front of me, but it is one of those options, pretty sure.
@PaulMansour thanks, that does the trick - wonder if there's a way to do it with ⎕WC though, it seems strange for the last tab to be selected, surely normally you'd want the first tab selected?
no idea what I've done - I seem to have managed to have it so when typing a line it is one colour theme, and then the rest is another, is there a way to just totally reset it?
@rak1507 I assume you are typing a line in the session? (and not in the editor) If you are in the Windows IDE, there is a session/trace tab on the colors dialog box. You might try resetting the the color scheme there.
@rak1507 As far as I know there is no way to do it with ⎕WC