Why am I getting errors with this code?

Question

J 2015-2-22

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/179632-why-am-i-getting-errors-with-this-code

评论： J 2015-2-22

trajectory.m

Could someone help me figure out why I am getting all kinds of errors with my code please. I have attached the *.m file containing my code. Thank you very much.

3 个评论
显示 1更早的评论隐藏 1更早的评论

Andrew Newell 2015-2-22

The script at the top doesn't call any of the functions.

J 2015-2-22

No, they are all in the same file.

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Greig 2015-2-22

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/179632-why-am-i-getting-errors-with-this-code#answer_168831

编辑：Greig 2015-2-22

在 MATLAB Online 中打开

Get_trajectory.m

There are a few issues here. First of all, you cannot declare functions in a standard m-file script. They have to be in separate m-files, or trajectory.m needs to be a function.

I recommend renaming it to "Get_trajectory.m" and making the start and end

function Stats = Get_trajectory
.... % all the other functions 
end % this is needed since all other function use end

Second, by defining trajectory as a function, we need to declare what the output should be. I guess it is all the output from your various functions? If so, then we need to call your various functions get their output and return this as the output of the Get_trajectory function (the "Stats" variable above). So, add something like this after you ask for the user input...

[xt,yt] = trajectory(v0,theta,t,g);
ymax = peakheight(v0,theta,g);
tmax = timeflight(v0,theta,g);
xmax = range(v0,theta,g);
Stats = [xt, yt, ymax, tmax, xmax];

Third, in the peakheight function, you a missing a * in the ymax calculation

    function [ymax] = peakheight(v0,theta,varargin)
        if nargin == 2
            g=9.8;  % if g not specified g=9.8
            ymax = ((v0^2)*((sin(theta))^2))/2*g;
        elseif nargin == 3
            %if the user enter the value for g
            g=varargin{1};
            ymax = ((v0^2)*((sin(theta))^2))/2*g;
        end
    end