Displayin command just once for the n number of iterations

Question

Kacper Witasinski 2022-2-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1649535-displayin-command-just-once-for-the-n-number-of-iterations

评论： Benjamin Thompson 2022-2-14

k = 0;
while k < 4001
if  k < 480
   disp("Hello World!")
else
    disp("Bye Bye World!")
end
k = k+1;
end

Hello, this is funny piece of my code. I want to display information included in first conditional loop ("Hello World!") only once, when code enters the loop, not every time when k is less than 480. The same applies to the else condition. The conditions cannot change though.

Can you please show me the way?

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Answer 1

Benjamin Thompson 2022-2-14

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https://ww2.mathworks.cn/matlabcentral/answers/1649535-displayin-command-just-once-for-the-n-number-of-iterations#answer_895735

So something like this?

if k == 480

disp("Hello World!")

elseif k == 481

disp("Bye Bye World!")

end

You could also define another variable and set it to true after calling disp:

k = 0;

displayedInfo = false;

while k < 4001

if k < 480 && displayedInfo == false

disp("Hello World!")

displayedInfo = true;

else

disp("Bye Bye World!")

end

k = k+1;

end

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Kacper Witasinski 2022-2-14

works just for "Hello World!" Imagine that I have dozens of such if loops, and I want to display doznes of such messages once for one loop, at the entry, not for every iteration.

Benjamin Thompson 2022-2-14

You can create more variables as you need. Set the variable to true once the message is displayed, and check the variable in the for loop to decide whether or not the message needs to be displayed. Give it a try and if you have more specific problems post another question.

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Answer 2

Alan Stevens 2022-2-14

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https://ww2.mathworks.cn/matlabcentral/answers/1649535-displayin-command-just-once-for-the-n-number-of-iterations#answer_895730

在 MATLAB Online 中打开

What about

if  k == 0
   disp("Hello World!")
elseif k == 480
    disp("Bye Bye World!")
end

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Kacper Witasinski 2022-2-14

编辑：Kacper Witasinski 2022-2-14

As I've mentioned, the conditions cannot change.

Now thanks to your proposal I've came up with creating additional if statement just for the value of 'k' for displaying this message, but I do not want to complicate the code with such a simple idea.

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