how to continuously loop until a condition is met?

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rafe brooks 2021-1-5

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评论： jessupj 2021-1-6

I have a set of data that is varying throughout (force plate data) . I am trying to find the bodyweight of the particpants as it loops through the whole script. I tried to use the mode(A) function and it worked for most but not all as the data varies between them all. So, how can i write a loop that keeps using the mode function until it finds a value that is above 400 and below 1000?

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jessupj 2021-1-5

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see the idea of a 'while' loop. you'd want something like:

value = InF;
while ~(value>400 && value<1000 );
    % perform operations
    value = ??? % some updated value based on the operations at this stage
end

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回答（1 个）

madhan ravi 2021-1-5

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编辑：madhan ravi 2021-1-5

在 MATLAB Online 中打开

value = % calculate mode;
while 1
    if ((value <= 4e2) && (value <= 1e3))
        break
    else
        % value = calculate mode again , if it doesn't satisfy
    end
end

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Walter Roberson 2021-1-6

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Sometimes when a user talks about continuing to search until a condition holds, the code is more naturally of the form

while true
    do some calculation
    if a condition holds
       break
    end
    do some more calculation
end

for example

while true
    xnew = 1 - f(xold).^2;
    if xnew > 0.99
        break
    end
    xold = xnew;
end

Yes, the form could be rewritten as a while with a condition, but it is not always natural to do so

initialize variables so that condition is false
first_time = true;
while ~condition
    if first_time
        first_time = false;
    else
        do some more calculation
    end
    do some calculation
end

jessupj 2021-1-6

i agree completely that there are instances where this would be the natural way to do it. however, i did not (and still don't... ) see anything in the OP question that indicates it is 'more natural' here.

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