Write a function called fare that computes the bus fare one must pay in a given city based on the distance travelled. Here is how the fare is calculated: the first mile is $2. Each additional mile up to a total trip distance of 10 miles is 25 cents.

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Sudarshan Agrawal 2018-6-16

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评论： Walter Roberson 2019-9-26

function a = fare(dist,age)
x=round(dist);
if x>=0 && x<=1 
    fare=2;
    if x>1 && x<=10
        fare=2+(0.25*(x-1));
        if x>10
            fare=4.25+(0.1*(x-10));
        end
    end
end
if age<=18 || age>=60
    a=0.8*fare;
else
    a=fare;
end
end

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Sudarshan Agrawal 2018-6-16

i am getting the following error:- Undefined function or variable 'fare'.

Error in fare (line 15) a=fare;

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Answer 1

dpb 2018-6-16

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在 MATLAB Online 中打开

function a = fare(dist,age) ... fare=2; ...

Unlike Fortran, the return value in a Matlab function is not stored in the function as a variable of the function name but one uses the defined return variable instead. You defined that as a in the function declaration.

I'd pick something a little more meaningful than just a, though, although that's not your problem.

a=2;

etc., will fix that reference issue. Maybe use

function cost = fare(dist,age)

or somesuch similar variable???

Is the distance actually rounded in the fare calculation or is it for any fraction of a mile over the previous full mile? The latter would seem more typical if not going to use actual mileage to nearest tenth or whatever...

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Stephen23 2018-6-16

Sudarshan Agrawal's "Answer" moved here:

I m still receiving the same problem. But the code is working for fare(0.2,67) only. the distance is rounded off to the nearest integer for the calculation

dpb 2018-6-16

编辑：dpb 2018-6-16

在 MATLAB Online 中打开

Yes, because when you used fare as a variable inside the function you aliased the function fare so it no longer is visible as a function; now it is a local variable.

As I said, "you can't do that!", Matlab is not Fortran.

But what are the expected answers for

   fare(1.2,67) 
   fare(1.7,67)

??

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Answer 2

Sudarshan Agrawal 2018-6-17

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编辑：Walter Roberson 2018-6-17

在 MATLAB Online 中打开

function cost = fare(dist,age)
x=round(dist);
if x>=0 && x<=1 
    f=2;
    if x>1 && x<=10
        f=2+(0.25*(x-1));
        if x>=11
            f=4.25+(0.1*(x-10));
        end
    end
end
if age<=18 || age>=60
    cost=0.8*f;
else
    cost=f;
end
end

The new code I tried!! It is working for fare(1.2,67) but not for fare(1.7,67).

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Walter Roberson 2018-6-17

With the structure you had, the test x>1&&x<=10 could only be made if x>=0&x<=1 had succeeded. The scope of the successful test if the first if extends until the matching "end" or "else" or "elseif"