why do i keep getting index exceeds matirx dimensions?

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parsh 2012-4-1

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/34141-why-do-i-keep-getting-index-exceeds-matirx-dimensions

I just typed in simple codes for plotting a graph and i keep getting the same error why is that?

d=1:1:10
theta=pi/4;
Dc= d/2.*(1-cos(theta));
Q= (2.^(3/2).*Dc.^(5/2).*sqrt(g).*(theta-0.5.*sin(2.*theta)).^(3/2))/(8.*sqrt (sin(theta).*(1-cos(theta).^(5/2))))
subplot (2,1,2);
plot (d,Q)
title('17473981')
xlabel('diameter')
ylabel('flow rate')
grid on

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the cyclist 2012-4-1

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https://ww2.mathworks.cn/matlabcentral/answers/34141-why-do-i-keep-getting-index-exceeds-matirx-dimensions#answer_42797

What is "g"? If I set g=1, your code works for me.

Might you have accidentally define your own variable named "cos", "sin", or "sqrt", so MATLAB thinks it is indexing a variable?

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parsh 2012-4-1

umm... it works. :) thank you so much

the cyclist 2012-4-1

Glad it worked, but that drastic solution does not necessarily help you understand where you went wrong. My best guess is that maybe you accidentally defined a new variable (maybe "xlabel") and MATLAB was trying to access that instead of the built-in function.

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