if-statement

问题 I have a time series dataframe and would like to create a new numeric column with values which are a function of an existing numeric column and which are assigned according to the day of the week column. For example, I would require something like the following code: Day <- c("Mo", "Mo", "Mo", "Tu", "Tu", "We", "We", "We", "We", "Th") Val <- c(1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000, 1000) df <- data.frame(cbind(Day,Val)) df$Adj <- ifelse(df$Day == "Mo" || df$Day == "Tu", as

问题 The If statement and any other boolean comparison is smart enought to stop at first FALSE value when evaluating A and B and C and D and at first TRUE value when evaluating A or B or C or D . What is the name of this behavior? Is this a compiler optimization? If so, there is a way to disable it with some compiler directive? 回答1: This is called 'boolean short-circuit evaluation', a form of 'lazy evaluation'. You can tell the compiler either to use or not to use this feature using compiler

问题 The If statement and any other boolean comparison is smart enought to stop at first FALSE value when evaluating A and B and C and D and at first TRUE value when evaluating A or B or C or D . What is the name of this behavior? Is this a compiler optimization? If so, there is a way to disable it with some compiler directive? 回答1: This is called 'boolean short-circuit evaluation', a form of 'lazy evaluation'. You can tell the compiler either to use or not to use this feature using compiler

问题 what i am trying to do is setup if statements to check if a checkbuttons value is on or off what i was thinking was something like this from Tkinter import * def checkbutton_value(): #If statement here #is their something like #if checkbox_1.onvalue == True: # checkbox_2.deselect() #if checkbox_1.varible == checkbox_1.onvalue: # checkbox_2.deselect() print 'Need Help on lines 7-8 or 10-11' root=Tk() checkbox_1 = Checkbutton(root, text='1 ', command=checkbutton_value).pack() checkbox_2 =

问题 what i am trying to do is setup if statements to check if a checkbuttons value is on or off what i was thinking was something like this from Tkinter import * def checkbutton_value(): #If statement here #is their something like #if checkbox_1.onvalue == True: # checkbox_2.deselect() #if checkbox_1.varible == checkbox_1.onvalue: # checkbox_2.deselect() print 'Need Help on lines 7-8 or 10-11' root=Tk() checkbox_1 = Checkbutton(root, text='1 ', command=checkbutton_value).pack() checkbox_2 =

问题 I'm trying to add images into one slide using python pptx package. How to add two images to one slide in python pptx But I have difficulties with when I do this in a for loop; let's say we have a bunch of pictures in the directory and we want to resize and add the current slide as we go along with the pictures in directory. When I have eagle or hawk in the directory resize & position them and put them into current slide and move the next one! What I am getting is that each picture in

问题 I've been struggling for a while to get this to work. I need to show this payment link in my woocommerce emails, but only on certain (custom) order statuses. How is it done? Thanks :) printf( wp_kses( /* translators: %1s item is the name of the site, %2s is a html link */ __( '%2$s', 'woocommerce' ), array( 'a' => array( 'href' => array(), ), ) ), esc_html( get_bloginfo( 'name', 'display' ) ), '<a href="' . esc_url( $order->get_checkout_payment_url() ) . '">' . esc_html__( 'Click here to pay

问题 Hi I am trying to write a macro function with do loop and if statement. I think I have messed up the if-then do and do loop and I can't figure out the problem. I have a table of kids information, which contains columns like age, gender, sports, instruments etc,. My original code, which works, looks like this: data old; set new; if sports in ("football","basketball") and age <=7 then type =1; else if sports='swimming' then type=2; if special_kid=. then do; if piano ^=. and piano_1 ^=. then do;

问题 With the following sample data I'm trying to create a new variable "Den" (value "0" or "1") based on the values of three conditional variables (Denial1, Denial2, and Denial3). I want a "0" if ANY of the three conditional variables has a "0" and a "1" only if EACH conditional variable that has a value in it has a value of "1" (e.g., isn't NA). structure(list(Denial1 = NA_real_, Denial2 = 1, Denial3 = NA_real_, Den = NA), .Names = c("Denial1", "Denial2", "Denial3", "Den" ), row.names = 1L,

问题 i'm trying to solve this issue, i'm relatively new to javascript, so: function termos() gives a true or false result; probably the solution to this is simple, but can't get to it. Is it possible to do this? i wrote this code just to exemplify my doubt function termos() { if($('.terms').is(':checked')) { return true; } else { return false; } } can i use } else if(termos() === false) { alert('please agree with terms'); return false; } This doesn't work 回答1: From what I understand you want to