I'm just wondering if Matlab can string together "or" statements? The current code for a simple menu is using
userinput = input(
"Select 1,2,3,4 and press enter: "
)
if
X == 1
disp(stuff)
if
X == 2
disp(stuff)
end
Seems like you should be able to use if X=(1||2||3||4) to avoid the multiple lines of code. Then:
if
X = (1||2||3||4)
Y= sprintf (
"You selected: "
, userinput)
disp(Y)
else
disp(
"That was not a choice"
)
end
We're on to using C++ now so I'm thinking along the lines of
cout
<<"You seleceted"<< variable<< endl
;
This is probably better done as a switch case but I was thinking about booleans when I started to try this.
I can't input text on the other side of this box for some reason
Click or otherwise position after the last character of your last line of code input. Click on the "Text" icon (far left one).
On Mac with Firefox, the key sequence would be to position somewhere on the last line of code, then press control-E to move to end of line, then press alt-enter to switch to text mode.
if
ismember(answer, [1, 2, 3, 4])
Your approach of (1|2|3|4) will not work in MATLAB. That will be considered to be equivalent to
if
(answer) == ((1 ~= 0) | (2 ~= 0) | (3 ~= 0) | (4 ~= 0))
The ((1 ~= 0) | (2 ~= 0) | (3 ~= 0) | (4 ~= 0)) part would evaluate to (true | true | true | true) which would be true. Then the test would have become
There is no hope that MATLAB will ever support a syntax like
Of course MATLAB will let you use input() multiple times.
You might want to consider menu():
buttonNumber = menu(
'Make a selection'
,
'1'
,
'2'
,
'3'
,
'4'
);
if
buttonNumber == 1
elseif
buttonNumber == 2
elseif
buttonNumber == 3
elseif
buttonNumber == 4
end
You can use a
switch
statement but
a switch statement will have one more line of code than an if/else.
Not sure how this full factorial combination generation followed by putting into a string method you're thinking of would work. I can't imagine it being simpler than a simple if/else.
How many are you going to have anyway? Hundreds? My programs typically have well over a thousand lines of code, so what's the big deal on having 3 or 4 extra lines if it's clearer and more intuitive, meaning easier to maintain? Do you really want some tricky, cryptic code just to save a line or two? I'd think not.
Not sure why you accepted that answer
if
X == 1 || X == 2 || X == 3 || X == 4
when you can
much more simply
do
assuming your user did what you told them to. Anyway, you're still going to have to check for the numbers individually if you want to execute different code depending on the number. So I don't understand why the accepted Answer is ideal. But whatever - it's your program and you can make it as simple or cryptic as you want.
I'm studying Matlab and C++ at the same time for an exam. The questions are going to specifically state to use "while", "do while", "if" etc. Looking at this type of question it's possible it could be asked to use boolean operators.
X <= 4
isn't quite as "idiot proof". -4 isn't a choice but the program returns a value. This isn't so much about saving code as trying to make sure how I think gets translated into what's being asked so if my code isn't excatly the same it functions the same way.
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