why I get error in scalar portion?

Question

SIDDHARTHKUMAR SANGHANI 2021-11-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1578240-why-i-get-error-in-scalar-portion

回答： Prateek Rai 2021-11-6

function valid = valid_date(year, month, day)
if nargin <3 && nargin > 3 && year < 1 && month < 1  && month > 13 && ~(isscalar(year) && isscalar(month) && isscalar(day)) 
    valid = false; 
else
    if  (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) && day < 32 && day > 0
        valid = true;
    elseif (month == 4 || month == 6 || month == 9 || month == 11 ) && day < 31 && day > 0
        valid = true;
    elseif month == 2 && day < 29 && day > 0
        valid = true;
    elseif ((mod(year,4) == 0 && ~mod(year, 100) == 0) ||  (mod(year,4) == 0 && mod(year, 400) == 0)) && month == 2 && day == 29
        valid = true;
    else
        valid = false;
    end
end
end

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Steven Lord 2021-11-3

Please show how you're calling valid_date and the full and exact text of the error message you receive (all the text displayed in red in the Command Window.)

In addition please pass along to your professor my suggestion to choose a different problem to assign as homework in the future, as this question has been asked about and discussed on MATLAB Answers a few (hundred) times before.

the cyclist 2021-11-3

在 MATLAB Online 中打开

I don't know if it is the source of your error, but you might want to double-check this part of your code ...

if nargin <3 && nargin > 3 ...

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Answer 1

Prateek Rai 2021-11-6

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1578240-why-i-get-error-in-scalar-portion#answer_825079

在 MATLAB Online 中打开

Hi,

You should first check for the scalar portion and then for other conditions.

Additionaly, you should also check for:

if nargin <3 && nargin > 3 && year < 1 && month < 1 && month > 13

It will only be true when all the conditions satisfy at the same time. It should be something like:

if nargin <3 || nargin > 3 || year < 1 || month < 1 || month > 13

So the whole code would be:

function valid = valid_date1(year, month, day)
if ~(isscalar(year) && isscalar(month) && isscalar(day)) || nargin <3 || nargin > 3 || year < 1 || month < 1  || month > 13 
    valid = false; 
else
    if  (month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) && day < 32 && day > 0
        valid = true;
    elseif (month == 4 || month == 6 || month == 9 || month == 11 ) && day < 31 && day > 0
        valid = true;
    elseif month == 2 && day < 29 && day > 0
        valid = true;
    elseif ((mod(year,4) == 0 && ~mod(year, 100) == 0) ||  (mod(year,4) == 0 && mod(year, 400) == 0)) && month == 2 && day == 29
        valid = true;
    else
        valid = false;
    end
end
end