Hi; Can you help me to find fault?

Write a function called sindeg that takes a matrix input called deg. The function returns a matrix of the same size as deg with each of its elements containing the sine of the corresponding element of deg. Note that the elements of deg are given in degrees and not radians. As a second output, the function returns a scalar that contains the average value of the first output. You are not allowed to use the sind and cosd built-in functions, but the use of any other function is acceptable.

My answer is;

function [sine, mean_sine] = sindeg(deg)
    sine = (exp(i*deg) - exp(-i*deg))/(2i);
    mean_sine = sum(sine) / length(deg);

The fault;

Problem 2 (sindeg):
                                       Testing with argument(s) [0 90 180]
   Feedback: Your function made an error for argument(s) [0 90 180]

      Your solution is _not_ correct.

I dont understand this feedback. When I try this feedback format, solution is correct too.

[Walter Roberson]

Please do not close questions that have an answer.

Answer 1

[Andrei Bobrov]

function [y, mean_sine] = sindeg(deg)
    xx = deg/180*pi;
    y = (exp(1i*xx) - exp(-1i*xx))/(2i);
    mean_sine = sum(y(:)) / numel(deg);
end

[SULE SAHIN]

Thank you so much but ; function [y, mean_sine] = sindeg(deg) xx = deg*pi/180; y = (exp(i*xx) - exp(-i*xx))./(2*i); mean_sine = sum(y) / length(deg);

                                    Testing with argument(s) [0 90 180]
    Feedback: Your function performed correctly for argument(s) [0 90 180]
                                       Testing with argument(s) [30 60;90 120]
    Feedback: Your function made an error for argument(s) [30 60;90 120]

    Your solution is _not_ correct.

[Andrei Bobrov]

fixed. use this variant:

mean_sine = sum(y(:)) / numel(deg);

[SULE SAHIN]

Thank you so much

[Vaibhav Sharma]

You are a god man !! i am in 6 th class and i have started programming with matlab and i was also stuck on this problem. i heard the name sin for the first time in my life you can figure how difficult it was for me i just needed the fixed version as i was doing the same mistake as shown before

[Jan]

@Vaibhav Sharma: Please stop creating flags to post a comment. Flags are thought to inform the admins or editors about a message, which might conflict with the terms of use, e.g. due to rudeness.