Function not giving an output

Question

Eric Brown 2022-4-10

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1693200-function-not-giving-an-output

回答： Voss 2022-4-10

The code I have is to find the cost of a parking bill. I want the code to return an error message if the inputs are not within my parameters but when I run it, there is not output. pt is a deliniation between long term and short term parking and time is suppose to be a 4 element row vector.

function y = Parking_Bill(pt,time)
if (pt == (1 || 2) && (size(time) == 4)) 
    w = time(1);
    d = time(2);
    h = time(3);
    m = time(4);
    if pt == 1
        if d>7 
            weeks = (d/7);
            w_fixed = fix(weeks)+ w;
            d_fixed = round(rem(d,7));
            
        else
            w_fixed = w;
            d_fixed = d;
        end
        if h>24
            days= (h/24);
            d_fixed= fix(days);
            h_fixed = rem(h,24)*24;
        else
            h_fixed = h;
        end
        if m > 60
            hours = m/60;
            h_fixed = fix(hours); 
        end
        if w_fixed >= 1
            weekly_bill= 50 * w_fixed;
        else
            weekly_bill = 0;
        end
        if d_fixed>=1
            daily_bill = 8* d_fixed;
        else
            daily_bill=0;
        end
        if h_fixed >= 1
            hourly_bill = 2+ (h_fixed-1);
        else 
            hourly_bill = 0;
        end
        total_bill = weekly_bill + daily_bill + hourly_bill;
        y = fprintf('Total bill =$%d.00', total_bill);
    if pt == 2
        if w > 0
            weeks_to_minutes = (w * 10080);
        end
        if d > 0
            days_to_minutes = (d * 1440);
        end
        if h > 0
            hours_to_minutes = (h * 60);
        end
        if m > 30
            minutes = (m/20);
            m_fixed= fix(minutes) * 2;
        else 
            m_fixed = 0;
        end
        total_bill = weeks_to_minutes + days_to_minutes + hours_to_minutes + m_fixed;
        y = fprintf('Total bill =$%d.00', total_bill);
    else 
       y = fprintf('Invaild input, check input');
        return;
    end
   end
 end
end

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Eric Brown 2022-4-10

Only ones that work.

the cyclist 2022-4-10

Rephrasing @KSSV's question:

Can you give specific examples of valid and invalid inputs?

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Answer 1

Voss 2022-4-10

0
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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1693200-function-not-giving-an-output#answer_939500

在 MATLAB Online 中打开

function y = Parking_Bill(pt,time)
% if (pt == (1 || 2) && (size(time) == 4)) 
if (pt == 1 || pt == 2) && numel(time) == 4
    
    w = time(1);
    d = time(2);
    h = time(3);
    m = time(4);
    
    if pt == 1
        
        % calculate total_bill for pt == 1
        
        % fprintf returns the number of bytes printed. you don't want
        % that. use sprintf to return the actual character vector printed
        
%         y = fprintf('Total bill =$%d.00', total_bill);
        y = sprintf('Total bill =$%d.00', total_bill);
        
%     if pt == 2
    elseif pt == 2
        
        % calculate total_bill for pt == 2
        
%         y = fprintf('Total bill =$%d.00', total_bill);
        y = sprintf('Total bill =$%d.00', total_bill);
        
    else
        
        % in this case sprintf/fprintf is not necessary 
        % (nothing formatted in y)
        
%         y = fprintf('Invaild input, check input');
        y = 'Invalid input (pt), check input';
        
        % return is not necessary here since the function is about to
        % return anyway (i.e., there's no more code to execute in this
        % case)
%         return;
        
    end
%    end
    
else
    
    % need to return some output y in case pt is not 1 and not 2,
    % or t does not have 4 elements
    y = 'Invalid input (pt and/or time), check input';
    
end % end if (pt == 1 || pt == 2) && numel(t) == 4
end % end function