It keeps giving me an error on my xlim and the graph that it gives me isn't complete

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Patrick 2024-3-3

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https://ww2.mathworks.cn/matlabcentral/answers/2089561-it-keeps-giving-me-an-error-on-my-xlim-and-the-graph-that-it-gives-me-isn-t-complete

评论： Voss 2024-3-3

Q = 9.4*10.^(-6);
q = 2.4*10.^(-5);
epsilon= 0.885*10*(-12);
R=0.1;
z=linspace(0,0.3, 1000);
F=(Q*q*z) *((1-z)/(sqrt(z.^2+R.^2)))/(2*epsilon);
plot(z,F); xlim('[1 0.3]');
xlabel('z'); ylabel('F');

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Answer 1

Voss 2024-3-3

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https://ww2.mathworks.cn/matlabcentral/answers/2089561-it-keeps-giving-me-an-error-on-my-xlim-and-the-graph-that-it-gives-me-isn-t-complete#answer_1420121

编辑：Voss 2024-3-3

在 MATLAB Online 中打开

xlim should be specified as a 1x2 numeric vector of increasing values, e.g.,

xlim([0.3 1]);

not as a character vector (with single-quotes)

xlim('[0.3 1]');

In this case your vector z has elements ranging from 0 to 0.3, and the plot is done with respect to z, so it's not clear why you want to set the x-limits outside the range of values in z. If you think the plot is incomplete, maybe you should change the definition of z to include higher values?

Q = 9.4e-6; % use "e" notation instead of "*10.^"

q = 2.4e-5;

% epsilon= 0.885*10*(-12); % should this one be 10.^(-12) instead of 10*(-12)?

epsilon= 0.885e-12;

R=0.1;

% z=linspace(0,0.3, 1000);

z = linspace(0,1,1000); % make z range from 0 to 1, for example

F=(Q*q*z) .*((1-z)./(sqrt(z.^2+R.^2)))/(2*epsilon);

% ^^ ^^ element-wise multiplication and division required here

plot(z,F); %xlim([0.3 1]);

xlabel('z'); ylabel('F');