i would like to plot a function that outputs 2 plots. One of domain [-2pi,2pi] and other of [-30pi,30pi] with labels and axis

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Fahad Qazi 2021-2-17

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https://ww2.mathworks.cn/matlabcentral/answers/747707-i-would-like-to-plot-a-function-that-outputs-2-plots-one-of-domain-2pi-2pi-and-other-of-30pi-3

评论： Fahad Qazi 2021-2-17

hello, i have just started working on matlab and i am stuck with this problem of bieng able to plot 2 functions using fplot and subplot. as per my assignment i am only allowed to use these two. I have written the code as per my understanding and for somereason either my function completes but there are no labels or legends or it doesnt even run, I will show you my code and example of outwhich which i am facing

This is my function

function Output = plot2domains(func, funcType) 
    figure;
    %lets give pie a variable
    Pie = pi;
    % place your work here
	subplot(2,1,1),fplot1 = fplot(func,[-2*Pie,2*Pie]);
    xaxis('x'); %we have given our xaxis title here
    yaxis('f(x'); %we have given our yaxis title here
     %what we have done here is plot the function using FPlot with the interval of -2pi and 2pi
    
    title({[funcType,': f(x) = ',char(func)]; ' for -2\pi < x < 2\pi'});
    % add more here
    %now we will have another plotting spot in the same function. so 
    subplot(2,1,2), fplot2 = fplot(func,[-30*Pie,30*Pie]);
    xaxis('x');
    yaxis('y');
     title({[funcType,': f(x) = ',char(func)]; ' for -30\pi < x < 30\pi'});
    %you need to make sure to initialize @x in function so that it runs
    %properly.
    % the below line is just temporary
    
    Output = {fplot1; fplot2};
end

where am i going wrong ?

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Answer 1

KALYAN ACHARJYA 2021-2-17

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/747707-i-would-like-to-plot-a-function-that-outputs-2-plots-one-of-domain-2pi-2pi-and-other-of-30pi-3#answer_625512

编辑：KALYAN ACHARJYA 2021-2-17

在 MATLAB Online 中打开

For Axes Labels

xaxis replace with xlabel

yaxis replace with ylabel

For legends

refer here

https://in.mathworks.com/help/matlab/ref/legend.html

function Output = plot2domains(func, funcType) 
    subplot(2,1,1),fplot1=fplot(func,[-2*pi,2*pi]);
    xlabel('x'); ylabel('f(x'); 
    legend('fplot1');
    title({[funcType,': f(x) = ',char(func)]; ' for -2\pi < x < 2\pi'});
    subplot(2,1,2),fplot2=fplot(func,[-30*pi,30*pi]);
    xlabel('x'); ylabel('y');
    legend('fplot2');
    title({[funcType,': f(x) = ',char(func)]; ' for -30\pi < x < 30\pi'});
    Output = {fplot1; fplot2};
end 

Note: Output is cell array with function line

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Fahad Qazi 2021-2-17

Thank you. i wanted to ask why was xaxis not working in the function ? also since i am passing a funcType which is basically a variable that holds the function algorithm how can i not show the @(x) function in the function. A clear example will be with of a picture here it is.

i want to remove here for instance @(x)24*x but if i do it directly, my function becomes null and doesnt work when it is passed by value into the function

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