hello Dear!! I'm a new coming in the community I want your help. about coding on MATLAB does the code is correct ? or the using of (&&) is no faire? and how can I correct it? thank you for respond .

if app.LikeCheckBox.Value==true
    app.EditField.Value='you Like our channal'
elseif app.LikeCheckBox.Value==true && app.ShareCheckBox.Value==true
    app.EditField.Value='you liked and shared'
elseif app.ShareCheckBox.Value==true
    app.EditField.Value='you Share our channal'
elseif app.ShareCheckBox.Value==true && app.SubscribeCheckBox.Value==true
    app.EditField.Value='you shared and subscribed'
elseif app.SubscribeCheckBox.Value==true
    app.EditField.Value='you Subscribed to our channal'
elseif app.LikeCheckBox.Value==true && app.SubscribeCheckBox.Value==true
    app.EditField.Value='good job'
else app.EditField.Value='Choose on item'
    app.EditField.HorizontalAlignment='center'
end

Answer 1

[Jacob Mathew]

Hey god,

You can use double ampersand (&&) as logical and with an if statement. The following piece of code demonstrates the same:

a = true;
b = true;
c = false;
a && b

ans = logical
   1

a && c

ans = logical
   0

Answer 2

[Image Analyst]

The double && is correct. However you don't need to do a logical comparison to true. If it's true, then app.LikeCheckBox.Value==true will return true when it evaluates that equality expression, which is just the same as app.LikeCheckBox.Value. So you can more simply just do

elseif app.LikeCheckBox.Value && app.ShareCheckBox.Value

etc. and not use the ==true.

Answer 3

[Walter Roberson]

     if app.LikeCheckBox.Value==true
                app.EditField.Value='you Like our channal'
     elseif app.LikeCheckBox.Value==true && app.ShareCheckBox.Value==true

Consider that if LikeCheckBox value is true then the first action will be triggered -- and no further checking of elseif will be done. So the only way to trigger the elseif is if LikeCheckbox is something other than true. But if LikeCheckBox value is something other than true, then it cannot be true for the purpose of the app.LikeCheckBox.Value==true test in the elseif clause.

You have two major choices:

1. You can check the most exclusive set of conditions first -- liked and shared and subscribed -- and then elseif different subsets to narrow down the possibilities.
2. You can build up a set of flags, flags(1,3) = false; flags(1) = app.LikeCheckBox.Value; flags(2) = app.ShareCheckBox.Value; flags(3) = app.SubscribeCheckBox.Value; . Now build up strings based on the flags. Such as if flags(2); if any(flags(1)) State = State + " and "; end; State = State + "shared"; end . At the end, the complete string will have been built up.

[Steven Lord]

Or rather than just using if / elseif / elseif / else, you could include some nested if statements to give some structure to the checking.

 if app.LikeCheckBox.Value
     % You at least liked the channel, now let's see about sharing /
     % subscribing
     if app.ShareCheckBox.Value
         % You liked and shared, so let's check subscribed
         if app.SubscribeCheckBox.Value
             str = "You Liked, Shared, and Subscribed to our channel";
         else
             str = "You Liked and Shared our channel";
         end
     else
         % You liked but didn't share, check subscribed
         if app.SubscribeCheckBox.Value
             str = "You Liked and Subscribed to our channel";
         else
             str = "You Liked our channel";
         end         
     end
 else
     % You didn't like the channel
     if app.ShareCheckBox.Value
         if app.SubscribeCheckBox.Value
             str = "You Shared and Subscribed to our channel";
         else
             str = "You Shared our channel";
         end
     else
         if app.SubscribeCheckBox.Value
             str = "You Subscribed to our channel";
         else
             str = "Why didn't you Like, Share, or Subscribe to the channel?";
         end         
     end
 end

From here you can see that all eight combinations of options are covered, by inspection of the eight messages assigned to the variable str. This would get unwieldy if you had more options or if you had more than two possible values for the options, but 2^3 options IMO is still manageable.