How to run a loop with isNaN

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Benjamin
Benjamin 2022-10-17
评论： Benjamin 2022-10-18
How would i make a loop where if a positive number isnt inputted, The question is asked again?
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Davide Masiello
Davide Masiello 2022-10-17
编辑：Davide Masiello 2022-10-17
Your code seems fine, just remove the line
a =~ NaN;
and it works, meaning that if you input a = nan then it'll display the 'Please only enter a numerical value for a: ' message.
Benjamin
Benjamin 2022-10-17
@Davide Masiello is there a way for this code to work if any letter is inputted as my value of a

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Davide Masiello
Davide Masiello 2022-10-17
编辑：Davide Masiello 2022-10-17
disp('Solving a quadratic polynonial (ax^2+bx+c), where a b and c are real numbers to 3 decimal places')
a = input ('What is your value for a?: '); %coefficient of x^2
while ~isnumeric(a) || isnan(a)
a = input ('Please only enter a numerical value for a: ');
end
Solving a quadratic polynonial (ax^2+bx+c), where a b and c are real numbers to 3 decimal places
What is your value for a?: nan
Please only enter a numerical value for a: 'a'
Please only enter a numerical value for a: 2
>>

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